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Fiorito AM, Blasi G, Brunelin J, Chowdury A, Diwadkar VA, Goghari VM, Gur RC, Kwon JS, Quarto T, Rolland B, Spilka MJ, Wolf DH, Yun JY, Fakra E, Sescousse G. Blunted brain responses to neutral faces in healthy first-degree relatives of patients with schizophrenia: an image-based fMRI meta-analysis. SCHIZOPHRENIA (HEIDELBERG, GERMANY) 2024; 10:38. [PMID: 38503766 PMCID: PMC10951276 DOI: 10.1038/s41537-024-00452-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/15/2023] [Accepted: 02/16/2024] [Indexed: 03/21/2024]
Abstract
Schizophrenia is characterized by the misattribution of emotional significance to neutral faces, accompanied by overactivations of the limbic system. To understand the disorder's genetic and environmental contributors, investigating healthy first-degree relatives is crucial. However, inconsistent findings exist regarding their ability to recognize neutral faces, with limited research exploring the cerebral correlates of neutral face processing in this population. Thus, we here investigated brain responses to neutral face processing in healthy first-degree relatives through an image-based meta-analysis of functional magnetic resonance imaging studies. We included unthresholded group-level T-maps from 5 studies comprising a total of 120 first-degree relatives and 150 healthy controls. In sensitivity analyses, we ran a combined image- and coordinate-based meta-analysis including 7 studies (157 first-degree relatives, 207 healthy controls) aiming at testing the robustness of the results in a larger sample of studies. Our findings revealed a pattern of decreased brain responses to neutral faces in relatives compared with healthy controls, particularly in limbic areas such as the bilateral amygdala, hippocampus, and insula. The same pattern was observed in sensitivity analyses. These results contrast with the overactivations observed in patients, potentially suggesting that this trait could serve as a protective factor in healthy relatives. However, further research is necessary to test this hypothesis.
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Affiliation(s)
- Anna M Fiorito
- Université Claude Bernard Lyon 1, CNRS, INSERM, Centre de Recherche en Neurosciences de Lyon CRNL U1028 UMR5292, PSYR2, 69500, Bron, France.
- Centre Hospitalier Le Vinatier, Bron, France.
| | - Giuseppe Blasi
- Group of Psychiatric Neuroscience, Department of Translational Biomedicine and Neuroscience, University of Bari Aldo Moro, Bari, Italy
- Azienda Ospedaliero-Universitaria Consorziale Policlinico, Bari, Italy
| | - Jérôme Brunelin
- Université Claude Bernard Lyon 1, CNRS, INSERM, Centre de Recherche en Neurosciences de Lyon CRNL U1028 UMR5292, PSYR2, 69500, Bron, France
- Centre Hospitalier Le Vinatier, Bron, France
| | - Asadur Chowdury
- Department of Psychiatry & Behavioral Neurosciences, Wayne State University, Detroit, MI, USA
| | - Vaibhav A Diwadkar
- Department of Psychiatry & Behavioral Neurosciences, Wayne State University, Detroit, MI, USA
| | - Vina M Goghari
- Department of Psychological Clinical Science, University of Toronto, Toronto, ON, Canada
| | - Ruben C Gur
- Department of Psychiatry, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA, USA
| | - Jun Soo Kwon
- Department of Psychiatry, Seoul National University College of Medicine, Seoul, Korea
| | - Tiziana Quarto
- Department of Humanities, University of Foggia, Foggia, Italy
| | - Benjamin Rolland
- Université Claude Bernard Lyon 1, CNRS, INSERM, Centre de Recherche en Neurosciences de Lyon CRNL U1028 UMR5292, PSYR2, 69500, Bron, France
- Centre Hospitalier Le Vinatier, Bron, France
| | | | - Daniel H Wolf
- Department of Psychiatry, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA, USA
| | - Je-Yeon Yun
- Department of Psychiatry, Seoul National University College of Medicine, Seoul, Korea
| | - Eric Fakra
- Université Claude Bernard Lyon 1, CNRS, INSERM, Centre de Recherche en Neurosciences de Lyon CRNL U1028 UMR5292, PSYR2, 69500, Bron, France
- Department of Psychiatry, University Hospital of Saint-Etienne, Saint-Etienne, France
| | - Guillaume Sescousse
- Université Claude Bernard Lyon 1, CNRS, INSERM, Centre de Recherche en Neurosciences de Lyon CRNL U1028 UMR5292, PSYR2, 69500, Bron, France
- Centre Hospitalier Le Vinatier, Bron, France
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2
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Ma X, Zheng W, Li C, Li Z, Tang J, Yuan L, Ouyang L, Jin K, He Y, Chen X. Decreased regional homogeneity and increased functional connectivity of default network correlated with neurocognitive deficits in subjects with genetic high-risk for schizophrenia: A resting-state fMRI study. Psychiatry Res 2019; 281:112603. [PMID: 31622873 DOI: 10.1016/j.psychres.2019.112603] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/04/2019] [Revised: 10/04/2019] [Accepted: 10/04/2019] [Indexed: 01/01/2023]
Abstract
The complex symptoms of schizophrenia (SCZ) have been associated with dysfunction of the default mode network (DMN). Subjects at genetic high risk (GHR) for SCZ exhibit similar but milder brain abnormalities. This study aimed to investigate functional alterations of DMN from the local to the whole and their relationships with cognitive deficits in GHR subjects. 42 GHR subjects and 38 matched healthy controls (HC) were studied by resting-state functional magnetic resonance imaging (rs-fMRI). Regional homogeneity (ReHo) analysis was performed to measure the local brain function of the DMN, derived by the group independent component analysis, and areas with aberrant ReHo were used as seeds in functional connectivity (FC). Compared with the HC group, the GHR group exhibited significantly decreased ReHo and increased FC in the fronto-limbic-striatal system within the DMN. Furthermore, a significant negative correlation was found between decreased ReHo in the right superior frontal gyrus and the delayed recall in GHR subjects. Our findings revealed decreased local function and hyper-connectivity in the fronto-limbic-striatal system of the DMN in GHR subjects, which is associated with cognitive deficits. This may improve our understanding of the neurophysiological endophenotypes of SCZ and the neural substrate underlying the cognitive deficits of the disease.
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Affiliation(s)
- Xiaoqian Ma
- Department of Psychiatry, Second Xiangya Hospital, Central South University, Changsha, China
| | - Wenxiao Zheng
- Department of Psychiatry, Second Xiangya Hospital, Central South University, Changsha, China; Department of Clinical Medicine, Third Xiangya Hospital, Central South University, Changsha, China
| | - Chunwang Li
- Department of Radiology, Hunan Children's Hospital, Changsha, China
| | - Zongchang Li
- Department of Psychiatry, Second Xiangya Hospital, Central South University, Changsha, China
| | - Jinsong Tang
- Department of Psychiatry, Second Xiangya Hospital, Central South University, Changsha, China
| | - Liu Yuan
- Department of Psychiatry, Second Xiangya Hospital, Central South University, Changsha, China
| | - Lijun Ouyang
- Department of Psychiatry, Second Xiangya Hospital, Central South University, Changsha, China
| | - Ke Jin
- Department of Radiology, Hunan Children's Hospital, Changsha, China
| | - Ying He
- Department of Psychiatry, Second Xiangya Hospital, Central South University, Changsha, China.
| | - Xiaogang Chen
- Department of Psychiatry, Second Xiangya Hospital, Central South University, Changsha, China; Mental Health Institute of Central South University, Changsha, Hunan, China; China National Clinical Research Center on Mental Disorders (Xiangya), Changsha, Hunan, China; China National Technology Institute on Mental Disorders, Changsha, Hunan, China; Hunan Key Laboratory of Psychiatry and Mental Health, Changsha, Hunan, China.
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3
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Kelly S, Guimond S, Lyall A, Stone WS, Shenton ME, Keshavan M, Seidman LJ. Neural correlates of cognitive deficits across developmental phases of schizophrenia. Neurobiol Dis 2018; 131:104353. [PMID: 30582983 DOI: 10.1016/j.nbd.2018.12.013] [Citation(s) in RCA: 27] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/09/2018] [Revised: 11/21/2018] [Accepted: 12/20/2018] [Indexed: 12/28/2022] Open
Abstract
Schizophrenia is associated with cognitive deficits across all stages of the illness (i.e., high risk, first episode, early and chronic phases). Identifying the underlying neurobiological mechanisms of these deficits is an important area of scientific inquiry. Here, we selectively review evidence regarding the pattern of deficits across the developmental trajectory of schizophrenia using the five cognitive domains identified by the Research Domain Criteria (RDoC) initiative. We also report associated findings from neuroimaging studies. We suggest that most cognitive domains are affected across the developmental trajectory, with corresponding brain structural and/or functional differences. The idea of a common mechanism driving these deficits is discussed, along with implications for cognitive treatment in schizophrenia.
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Affiliation(s)
- Sinead Kelly
- Massachusetts Mental Health Center, Public Psychiatry Division, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, MA, USA; Psychiatry Neuroimaging Laboratory, Department of Psychiatry, Brigham and Women's Hospital, Harvard Medical School, Boston, MA, USA
| | - Synthia Guimond
- Massachusetts Mental Health Center, Public Psychiatry Division, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, MA, USA; The Royal's Institute of Mental Health Research, University of Ottawa, Ottawa, ON, Canada
| | - Amanda Lyall
- Psychiatry Neuroimaging Laboratory, Department of Psychiatry, Brigham and Women's Hospital, Harvard Medical School, Boston, MA, USA; Department of Psychiatry, Massachusetts General Hospital, Harvard Medical School, Boston, MA, USA
| | - William S Stone
- Massachusetts Mental Health Center, Public Psychiatry Division, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, MA, USA
| | - Martha E Shenton
- Psychiatry Neuroimaging Laboratory, Department of Psychiatry, Brigham and Women's Hospital, Harvard Medical School, Boston, MA, USA; Department of Psychiatry, Massachusetts General Hospital, Harvard Medical School, Boston, MA, USA; Department of Radiology, Brigham and Women's Hospital, Harvard Medical School, Boston, MA, USA; VA Boston Healthcare System, Brockton Division, Brockton, MA, USA
| | - Matcheri Keshavan
- Massachusetts Mental Health Center, Public Psychiatry Division, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, MA, USA.
| | - Larry J Seidman
- Massachusetts Mental Health Center, Public Psychiatry Division, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, MA, USA; Department of Psychiatry, Massachusetts General Hospital, Harvard Medical School, Boston, MA, USA
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4
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Bucci P, Galderisi S, Mucci A, Rossi A, Rocca P, Bertolino A, Aguglia E, Amore M, Andriola I, Bellomo A, Biondi M, Cuomo A, dell'Osso L, Favaro A, Gambi F, Giordano GM, Girardi P, Marchesi C, Monteleone P, Montemagni C, Niolu C, Oldani L, Pacitti F, Pinna F, Roncone R, Vita A, Zeppegno P, Maj M. Premorbid academic and social functioning in patients with schizophrenia and its associations with negative symptoms and cognition. Acta Psychiatr Scand 2018; 138:253-266. [PMID: 29984409 DOI: 10.1111/acps.12938] [Citation(s) in RCA: 41] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Accepted: 06/14/2018] [Indexed: 12/11/2022]
Abstract
OBJECTIVE The study aimed to explore premorbid academic and social functioning in patients with schizophrenia, and its associations with the severity of negative symptoms and neurocognitive impairment. METHOD Premorbid adjustment (PA) in patients with schizophrenia was compared to early adjustment in unaffected first-degree relatives and healthy controls. Its associations with psychopathology, cognition, and real-life functioning were investigated. The associations of PA with primary negative symptoms and their two factors were explored. RESULTS We found an impairment of academic and social PA in patients (P ≤ 0.000001) and an impairment of academic aspects of early adjustment in relatives (P ≤ 0.01). Patients with poor PA showed greater severity of negative symptoms (limited to avolition after excluding the effect of depression/parkinsonism), working memory, social cognition, and real-life functioning (P ≤ 0.01 to ≤0.000001). Worse academic and social PA were associated with greater severity of psychopathology, cognitive impairment, and real-life functioning impairment (P ≤ 0.000001). Regression analyses showed that worse PA in the academic domain was mainly associated to the impairment of working memory, whereas worse PA in the social domain to avolition (P ≤ 0.000001). CONCLUSION Our findings suggest that poor early adjustment may represent a marker of vulnerability to schizophrenia and highlight the need for preventive/early interventions based on psychosocial and/or cognitive programs.
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Affiliation(s)
- P Bucci
- Department of Psychiatry, University of Campania L. Vanvitelli, Naples, Italy
| | - S Galderisi
- Department of Psychiatry, University of Campania L. Vanvitelli, Naples, Italy
| | - A Mucci
- Department of Psychiatry, University of Campania L. Vanvitelli, Naples, Italy
| | - A Rossi
- Section of Psychiatry, Department of Biotechnological and Applied Clinical Sciences, University of L'Aquila, L'Aquila, Italy
| | - P Rocca
- Section of Psychiatry, Department of Neuroscience, University of Turin, Turin, Italy
| | - A Bertolino
- Department of Neurological and Psychiatric Sciences, University of Bari, Bari, Italy
| | - E Aguglia
- Department of Clinical and Molecular Biomedicine, Psychiatry Unit, University of Catania, Catania, Italy
| | - M Amore
- Section of Psychiatry, Department of Neurosciences, Rehabilitation, Ophthalmology, Genetics and Maternal and Child Health, University of Genoa, Genoa, Italy
| | - I Andriola
- Department of Neurological and Psychiatric Sciences, University of Bari, Bari, Italy
| | - A Bellomo
- Psychiatry Unit, Department of Medical Sciences, University of Foggia, Foggia, Italy
| | - M Biondi
- Department of Neurology and Psychiatry, Sapienza University of Rome, Rome, Italy
| | - A Cuomo
- Department of Molecular Medicine and Clinical Department of Mental Health, University of Siena, Siena, Italy
| | - L dell'Osso
- Section of Psychiatry, Department of Clinical and Experimental Medicine, University of Pisa, Pisa, Italy
| | - A Favaro
- Department of Neurosciences, Psychiatric Clinic, University of Padua, Padua, Italy
| | - F Gambi
- Chair of Psychiatry, Department of Neuroscience and Imaging, G. d'Annunzio University, Chieti, Italy
| | - G M Giordano
- Department of Psychiatry, University of Campania L. Vanvitelli, Naples, Italy
| | - P Girardi
- Department of Neurosciences, Mental Health and Sensory Organs, S. Andrea Hospital, Sapienza University of Rome, Rome, Italy
| | - C Marchesi
- Department of Neuroscience, Psychiatry Unit, University of Parma, Parma, Italy
| | - P Monteleone
- Chair of Psychiatry, Department of Medicine and Surgery, University of Salerno, Salerno, Italy
| | - C Montemagni
- Section of Psychiatry, Department of Neuroscience, University of Turin, Turin, Italy
| | - C Niolu
- Chair of Psychiatry, Department of Systems Medicine, Tor Vergata University of Rome, Rome, Italy
| | - L Oldani
- Department of Psychiatry, University of Milan, Milan, Italy
| | - F Pacitti
- Section of Psychiatry, Department of Biotechnological and Applied Clinical Sciences, University of L'Aquila, L'Aquila, Italy
| | - F Pinna
- Section of Psychiatry, Department of Public Health, Clinical and Molecular Medicine, University of Cagliari, Cagliari, Italy
| | - R Roncone
- Unit of Psychiatry, Department of Life, Health and Environmental Sciences, University of L'Aquila, L'Aquila, Italy
| | - A Vita
- Psychiatric Unit, School of Medicine, University of Brescia, Brescia, Italy.,Department of Mental Health, Spedali Civili Hospital, Brescia, Italy
| | - P Zeppegno
- Psychiatric Unit, Department of Translational Medicine, University of Eastern Piedmont, Novara, Italy
| | - M Maj
- Department of Psychiatry, University of Campania L. Vanvitelli, Naples, Italy
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5
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Mucci A, Galderisi S, Green MF, Nuechterlein K, Rucci P, Gibertoni D, Rossi A, Rocca P, Bertolino A, Bucci P, Hellemann G, Spisto M, Palumbo D, Aguglia E, Amodeo G, Amore M, Bellomo A, Brugnoli R, Carpiniello B, Dell'Osso L, Di Fabio F, di Giannantonio M, Di Lorenzo G, Marchesi C, Monteleone P, Montemagni C, Oldani L, Romano R, Roncone R, Stratta P, Tenconi E, Vita A, Zeppegno P, Maj M. Familial aggregation of MATRICS Consensus Cognitive Battery scores in a large sample of outpatients with schizophrenia and their unaffected relatives. Psychol Med 2018; 48:1359-1366. [PMID: 29017620 DOI: 10.1017/s0033291717002902] [Citation(s) in RCA: 32] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
BACKGROUND The increased use of the MATRICS Consensus Cognitive Battery (MCCB) to investigate cognitive dysfunctions in schizophrenia fostered interest in its sensitivity in the context of family studies. As various measures of the same cognitive domains may have different power to distinguish between unaffected relatives of patients and controls, the relative sensitivity of MCCB tests for relative-control differences has to be established. We compared MCCB scores of 852 outpatients with schizophrenia (SCZ) with those of 342 unaffected relatives (REL) and a normative Italian sample of 774 healthy subjects (HCS). We examined familial aggregation of cognitive impairment by investigating within-family prediction of MCCB scores based on probands' scores. METHODS Multivariate analysis of variance was used to analyze group differences in adjusted MCCB scores. Weighted least-squares analysis was used to investigate whether probands' MCCB scores predicted REL neurocognitive performance. RESULTS SCZ were significantly impaired on all MCCB domains. REL had intermediate scores between SCZ and HCS, showing a similar pattern of impairment, except for social cognition. Proband's scores significantly predicted REL MCCB scores on all domains except for visual learning. CONCLUSIONS In a large sample of stable patients with schizophrenia, living in the community, and in their unaffected relatives, MCCB demonstrated sensitivity to cognitive deficits in both groups. Our findings of significant within-family prediction of MCCB scores might reflect disease-related genetic or environmental factors.
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Affiliation(s)
- A Mucci
- Department of Psychiatry,Campania University "Luigi Vanvitelli",Naples,Italy
| | - S Galderisi
- Department of Psychiatry,Campania University "Luigi Vanvitelli",Naples,Italy
| | - M F Green
- Department of Psychiatry and Biobehavioral Sciences,Semel Institute for Neuroscience and Human Behavior,University of California Los Angeles,Los Angeles,CA,USA
| | - K Nuechterlein
- Department of Psychiatry and Biobehavioral Sciences,Semel Institute for Neuroscience and Human Behavior,University of California Los Angeles,Los Angeles,CA,USA
| | - P Rucci
- Department of Biomedical and Neuromotor Sciences,University of Bologna,Bologna,Italy
| | - D Gibertoni
- Department of Biomedical and Neuromotor Sciences,University of Bologna,Bologna,Italy
| | - A Rossi
- Department of Biotechnological and Applied Clinical Sciences,Section of Psychiatry,University of L'Aquila,L'Aquila,Italy
| | - P Rocca
- Department of Neuroscience,Section of Psychiatry,University of Turin,Turin,Italy
| | - A Bertolino
- Department of Neurological and Psychiatric Sciences,University of Bari,Bari,Italy
| | - P Bucci
- Department of Psychiatry,Campania University "Luigi Vanvitelli",Naples,Italy
| | - G Hellemann
- Department of Psychiatry and Biobehavioral Sciences,Semel Institute for Neuroscience and Human Behavior,University of California Los Angeles,Los Angeles,CA,USA
| | - M Spisto
- Department of Psychiatry,Campania University "Luigi Vanvitelli",Naples,Italy
| | - D Palumbo
- Department of Psychiatry,Campania University "Luigi Vanvitelli",Naples,Italy
| | - E Aguglia
- Department of Clinical and Molecular Biomedicine,Psychiatry Unit,University of Catania,Catania,Italy
| | - G Amodeo
- Department of Molecular Medicine and Clinical Department of Mental Health,University of Siena,Siena,Italy
| | - M Amore
- Department of Neurosciences,Rehabilitation,Ophthalmology,Genetics and Maternal and Child Health,Section of Psychiatry,University of Genoa,Genoa,Italy
| | - A Bellomo
- Department of Medical Sciences,Psychiatry Unit,University of Foggia,Foggia,Italy
| | - R Brugnoli
- Department of Neurosciences,Mental Health and Sensory Organs,S. Andrea Hospital,Sapienza University of Rome,Rome,Italy
| | - B Carpiniello
- Department of Public Health,Clinical and Molecular Medicine,Section of Psychiatry,University of Cagliari,Cagliari,Italy
| | - L Dell'Osso
- Department of Clinical and Experimental Medicine,Section of Psychiatry,University of Pisa,Pisa,Italy
| | - F Di Fabio
- Department of Neurology and Psychiatry,Sapienza University of Rome,Rome,Italy
| | - M di Giannantonio
- Department of Neuroscience and Imaging,Chair of Psychiatry,G. d'Annunzio University,Chieti,Italy
| | - G Di Lorenzo
- Department of Systems Medicine,Chair of Psychiatry,Tor Vergata University of Rome,Rome,Italy
| | - C Marchesi
- Department of Neuroscience,Psychiatry Unit,University of Parma,Parma,Italy
| | - P Monteleone
- Department of Medicine and Surgery,Chair of Psychiatry,University of Salerno,Salerno,Italy
| | - C Montemagni
- Department of Neuroscience,Section of Psychiatry,University of Turin,Turin,Italy
| | - L Oldani
- Department of Psychiatry,University of Milan,Milan,Italy
| | - R Romano
- Department of Neurological and Psychiatric Sciences,University of Bari,Bari,Italy
| | - R Roncone
- Department of Life,Health and Environmental Sciences,Unit of Psychiatry,University of L'Aquila,L'Aquila,Italy
| | - P Stratta
- Department of Biotechnological and Applied Clinical Sciences,Section of Psychiatry,University of L'Aquila,L'Aquila,Italy
| | - E Tenconi
- Psychiatric Clinic,Department of Neurosciences,University of Padua,Padua,Italy
| | - A Vita
- Department of Mental Health,Psychiatric Unit,School of Medicine,University of Brescia,Spedali Civili Hospital,Brescia,Italy
| | - P Zeppegno
- Department of Translational Medicine,Psychiatric Unit,University of Eastern Piedmont,Novara,Italy
| | - M Maj
- Department of Psychiatry,Campania University "Luigi Vanvitelli",Naples,Italy
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Miller JA, Scult MA, Conley ED, Chen Q, Weinberger DR, Hariri AR. Effects of Schizophrenia Polygenic Risk Scores on Brain Activity and Performance During Working Memory Subprocesses in Healthy Young Adults. Schizophr Bull 2018; 44:844-853. [PMID: 29040762 PMCID: PMC6007653 DOI: 10.1093/schbul/sbx140] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
Recent work has begun to shed light on the neural correlates and possible mechanisms of polygenic risk for schizophrenia. Here, we map a schizophrenia polygenic risk profile score (PRS) based on genome-wide association study significant loci onto variability in the activity and functional connectivity of a frontoparietal network supporting the manipulation versus maintenance of information during a numerical working memory (WM) task in healthy young adults (n = 99, mean age = 19.8). Our analyses revealed that higher PRS was associated with hypoactivity of the dorsolateral prefrontal cortex (dlPFC) during the manipulation but not maintenance of information in WM (r2 = .0576, P = .018). Post hoc analyses revealed that PRS-modulated dlPFC hypoactivity correlated with faster reaction times during WM manipulation (r2 = .0967, P = .002), and faster processing speed (r2 = .0967, P = .003) on a separate behavioral task. These PRS-associated patterns recapitulate dlPFC hypoactivity observed in patients with schizophrenia during central executive manipulation of information in WM on this task.
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Affiliation(s)
- Jacob A Miller
- UC Berkeley Graduate Neuroscience Program, Helen Wills Neuroscience Institute, Berkeley, CA
| | - Matthew A Scult
- Laboratory of NeuroGenetics, Department of Psychology & Neuroscience, Duke University, Durham, NC,To whom correspondence should be addressed; tel: 919-684-1039, fax: 919-660-5726, e-mail:
| | | | - Qiang Chen
- Lieber Institute for Brain Development, Baltimore, MD,Department of Psychiatry, Johns Hopkins School of Medicine, Baltimore, MD,Department of Neurology, Johns Hopkins School of Medicine, Baltimore, MD,Department of Neuroscience, Johns Hopkins School of Medicine, Baltimore, MD,Institute of Genetic Medicine, Johns Hopkins School of Medicine, Baltimore, MD
| | - Daniel R Weinberger
- Lieber Institute for Brain Development, Baltimore, MD,Department of Psychiatry, Johns Hopkins School of Medicine, Baltimore, MD,Department of Neurology, Johns Hopkins School of Medicine, Baltimore, MD,Department of Neuroscience, Johns Hopkins School of Medicine, Baltimore, MD,Institute of Genetic Medicine, Johns Hopkins School of Medicine, Baltimore, MD
| | - Ahmad R Hariri
- Laboratory of NeuroGenetics, Department of Psychology & Neuroscience, Duke University, Durham, NC
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7
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Gupta T, DeVylder JE, Auerbach R, Schiffman J, Mittal VA. Speech illusions and working memory performance in non-clinical psychosis. Schizophr Res 2018; 195:391-395. [PMID: 29089190 PMCID: PMC5924653 DOI: 10.1016/j.schres.2017.10.031] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/10/2017] [Revised: 09/28/2017] [Accepted: 10/15/2017] [Indexed: 11/28/2022]
Abstract
Psychotic disorders are characterized by auditory verbal hallucinations (AVHs), and research has shown that AVHs are linked to deficits in working memory. Our understanding of AVHs across the psychosis continuum is limited. To date, little research has tested whether hallucination proneness (HP) is linked with abnormalities on experimental multispeaker babble tasks. Few investigations have been conducted to determine how task performance might be linked to cognitive functioning. The objective of the current study is to better understand this empirical gap. A total of 70 adults (30 healthy controls and 40 HP individuals) were administered an experimental task in which they listened to multispeaker babble and were instructed to report any words or chains of consecutive words (CCWs) perceived. Participants also were administered nonverbal and verbal working memory tasks. Findings revealed that relative to the control group, the HP individuals perceived more words and longer CCWs during the task. While there were no significant differences in working memory tasks between the HP and control groups, longer CCW's were associated with decreased verbal working memory scores in the HP group. AVH proneness may occur across a continuum of psychosis and may be linked with other theoretically relevant cognitive vulnerability factors.
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Affiliation(s)
- Tina Gupta
- Department of Psychology, Northwestern University, Evanston, IL, USA.
| | - Jordan E. DeVylder
- University of Maryland School of Social Work, Baltimore MD USA, Northwestern University, Evanston IL USA
| | - Randy Auerbach
- Center for Depression, Anxiety and Stress Research, McLean Hospital, Belmont, MA, Northwestern University, Evanston IL USA,Department of Psychiatry, Harvard Medical School, Boston MA USA, Northwestern University, Evanston IL USA
| | - Jason Schiffman
- University of Maryland, Baltimore County, Department of Psychology, Baltimore MD USA, Northwestern University, Evanston IL USA
| | - Vijay A. Mittal
- Department of Psychology, Northwestern University, Evanston IL USA,Department of Psychiatry, Northwestern University, Evanston IL USA,Institute for Policy Research, Northwestern University, Evanston IL USA,Department of Medical Social Sciences, Northwestern University, Evanston IL USA
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8
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Blasiman RN, Was CA. Why Is Working Memory Performance Unstable? A Review of 21 Factors. EUROPES JOURNAL OF PSYCHOLOGY 2018; 14:188-231. [PMID: 29899806 PMCID: PMC5973525 DOI: 10.5964/ejop.v14i1.1472] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2017] [Accepted: 08/25/2017] [Indexed: 01/05/2023]
Abstract
In this paper, we systematically reviewed twenty-one factors that have been shown to either vary with or influence performance on working memory (WM) tasks. Specifically, we review previous work on the influence of intelligence, gender, age, personality, mental illnesses/medical conditions, dieting, craving, stress/anxiety, emotion/motivation, stereotype threat, temperature, mindfulness training, practice, bilingualism, musical training, altitude/hypoxia, sleep, exercise, diet, psychoactive substances, and brain stimulation on WM performance. In addition to a review of the literature, we suggest several frameworks for classifying these factors, identify shared mechanisms between several variables, and suggest areas requiring further investigation. This review critically examines the breadth of research investigating WM while synthesizing the results across related subfields in psychology.
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Heredity characteristics of schizophrenia shown by dynamic functional connectivity analysis of resting-state functional MRI scans of unaffected siblings. Neuroreport 2018; 27:843-8. [PMID: 27295028 DOI: 10.1097/wnr.0000000000000622] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
Previous static resting-state functional connectivity (FC) MRI (rs-fcMRI) studies have suggested certain heredity characteristics of schizophrenia. Recently, dynamic rs-fcMRI analysis, which can better characterize the time-varying nature of intrinsic activity and connectivity and may therefore unveil the special connectivity patterns that are always lost in static FC analysis, has shown a potential neuroendophenotype of schizophrenia. In this study, we have extended previous static rs-fcMRI studies to a dynamic study by exploring whether healthy siblings share aberrant dynamic FC patterns with schizophrenic patients, which may imply a potential risk for siblings to develop schizophrenia. We utilized the dynamic rs-fcMRI method using a sliding window approach to evaluate FC discrepancies within transient states across schizophrenic patients, unaffected siblings, and matched healthy controls. Statistical analysis showed five trait-related connections that are related to cingulo-opercular, occipital, and default mode networks, reflecting the shared connectivity alterations between schizophrenic patients and their unaffected siblings. The findings suggested that schizophrenic patients and their unaffected siblings shared common transient functional disconnectivity, implying a potential risk for the healthy siblings of developing schizophrenia.
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10
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Moustafa AA, Garami JK, Mahlberg J, Golembieski J, Keri S, Misiak B, Frydecka D. Cognitive function in schizophrenia: conflicting findings and future directions. Rev Neurosci 2018; 27:435-48. [PMID: 26756090 DOI: 10.1515/revneuro-2015-0060] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/25/2015] [Accepted: 11/16/2015] [Indexed: 02/02/2023]
Abstract
INTRODUCTION Schizophrenia is a severe mental disorder with multiple psychopathological domains being affected. Several lines of evidence indicate that cognitive impairment serves as the key component of schizophrenia psychopathology. Although there have been a multitude of cognitive studies in schizophrenia, there are many conflicting results. We reasoned that this could be due to individual differences among the patients (i.e. variation in the severity of positive vs. negative symptoms), different task designs, and/or the administration of different antipsychotics. METHODS We thus review existing data concentrating on these dimensions, specifically in relation to dopamine function. We focus on most commonly used cognitive domains: learning, working memory, and attention. RESULTS We found that the type of cognitive domain under investigation, medication state and type, and severity of positive and negative symptoms can explain the conflicting results in the literature. CONCLUSIONS This review points to future studies investigating individual differences among schizophrenia patients in order to reveal the exact relationship between cognitive function, clinical features, and antipsychotic treatment.
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11
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Gou N, Liu Z, Palaniyappan L, Li M, Pan Y, Chen X, Tao H, Wu G, Ouyang X, Wang Z, Dou T, Xue Z, Pu W. Effects of DISC1 Polymorphisms on Resting-State Spontaneous Neuronal Activity in the Early-Stage of Schizophrenia. Front Psychiatry 2018; 9:137. [PMID: 29875705 PMCID: PMC5974222 DOI: 10.3389/fpsyt.2018.00137] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/15/2017] [Accepted: 03/29/2018] [Indexed: 12/02/2022] Open
Abstract
Background: Localized abnormalities in the synchrony of spontaneous neuronal activity, measured with regional homogeneity (ReHo), has been consistently reported in patients with schizophrenia (SCZ) and their unaffected siblings. To date, little is known about the genetic influences affecting the spontaneous neuronal activity in SCZ. DISC1, a strong susceptible gene for SCZ, has been implicated in neuronal excitability and synaptic function possibly associated with regional spontaneous neuronal activity. This study aimed to examine the effects of DISC1 variations on the regional spontaneous neuronal activity in SCZ. Methods: Resting-state fMRI data were obtained from 28 SCZ patients and 21 healthy controls (HC) for ReHo analysis. Six single nucleotide polymorphisms (SNPs) of DISC1 gene were genotyped using the PCR and direct sequencing. Results: Significant diagnosis × genotype interactions were noted for three SNPs (rs821616, rs821617, and rs2738880). For rs821617, the interactions were localized to the precuneus, basal ganglia and pre-/post-central regions. Significant interactive effects were identified at the temporal and post-central gyri for rs821616 (Ser704Cys) and the inferior temporal gyrus for rs2738880. Furthermore, post-hoc analysis revealed that the DISC1 variations on these SNPs exerted different influences on ReHo between SCZ patients and HC. Conclusion: To our knowledge this is the first study to unpick the influence of DISC1 variations on spontaneous neuronal activity in SCZ; Given the emerging evidence that ReHo is a stable inheritable phenotype for schizophrenia, our findings suggest the DISC1 variations are possibly an inheritable source for the altered ReHo in this disorder.
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Affiliation(s)
- Ningzhi Gou
- Mental Health Institute, Second Xiangya Hospital, Central South University, Changsha, China.,Key Laboratory of Psychiatry and Mental Health of Hunan Province, The China National Clinical Research Center for Mental Health Disorders, National Technology Institute of Psychiatry, Changsha, China
| | - Zhening Liu
- Mental Health Institute, Second Xiangya Hospital, Central South University, Changsha, China.,Key Laboratory of Psychiatry and Mental Health of Hunan Province, The China National Clinical Research Center for Mental Health Disorders, National Technology Institute of Psychiatry, Changsha, China
| | - Lena Palaniyappan
- Departments of Psychiatry and Medical Biophysics & Robarts and Lawson Research Institutes, University of Western Ontario, London, ON, Canada
| | - Mingding Li
- Zhejiang University School of Medicine, Zhejiang University, Hangzhou, China
| | - Yunzhi Pan
- Mental Health Institute, Second Xiangya Hospital, Central South University, Changsha, China.,Key Laboratory of Psychiatry and Mental Health of Hunan Province, The China National Clinical Research Center for Mental Health Disorders, National Technology Institute of Psychiatry, Changsha, China
| | - Xudong Chen
- Mental Health Institute, Second Xiangya Hospital, Central South University, Changsha, China.,Key Laboratory of Psychiatry and Mental Health of Hunan Province, The China National Clinical Research Center for Mental Health Disorders, National Technology Institute of Psychiatry, Changsha, China
| | - Haojuan Tao
- Mental Health Institute, Second Xiangya Hospital, Central South University, Changsha, China.,Key Laboratory of Psychiatry and Mental Health of Hunan Province, The China National Clinical Research Center for Mental Health Disorders, National Technology Institute of Psychiatry, Changsha, China
| | - Guowei Wu
- Mental Health Institute, Second Xiangya Hospital, Central South University, Changsha, China.,Key Laboratory of Psychiatry and Mental Health of Hunan Province, The China National Clinical Research Center for Mental Health Disorders, National Technology Institute of Psychiatry, Changsha, China
| | - Xuan Ouyang
- Mental Health Institute, Second Xiangya Hospital, Central South University, Changsha, China.,Key Laboratory of Psychiatry and Mental Health of Hunan Province, The China National Clinical Research Center for Mental Health Disorders, National Technology Institute of Psychiatry, Changsha, China
| | - Zheng Wang
- Mental Health Institute, Second Xiangya Hospital, Central South University, Changsha, China.,Key Laboratory of Psychiatry and Mental Health of Hunan Province, The China National Clinical Research Center for Mental Health Disorders, National Technology Institute of Psychiatry, Changsha, China
| | - Taotao Dou
- Department of Neurosurgery, The First affiliated Hospital of Xinjiang Medical University, Urumqi, China
| | - Zhimin Xue
- Mental Health Institute, Second Xiangya Hospital, Central South University, Changsha, China.,Key Laboratory of Psychiatry and Mental Health of Hunan Province, The China National Clinical Research Center for Mental Health Disorders, National Technology Institute of Psychiatry, Changsha, China
| | - Weidan Pu
- Medical Psychological Center, Second Xiangya Hospital, Central South University, Changsha, China.,Medical Psychological Institute of Central South University, Changsha, China
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12
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Zouraraki C, Karamaouna P, Karagiannopoulou L, Giakoumaki SG. Schizotypy-Independent and Schizotypy-Modulated Cognitive Impairments in Unaffected First-Degree Relatives of Schizophrenia-spectrum Patients. Arch Clin Neuropsychol 2017; 32:1010-1025. [PMID: 28383650 DOI: 10.1093/arclin/acx029] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/05/2016] [Accepted: 03/27/2017] [Indexed: 11/14/2022] Open
Abstract
Objective The aim of the study was to compare the neurocognitive profile of unaffected first-degree relatives of schizophrenia patients with control individuals, controlling for different schizotypal traits. Method One hundred and fifteen adult unaffected first-degree relatives of schizophrenia-spectrum patients and 122 controls were tested for schizotypy with the Schizotypal Personality Questionnaire. They also underwent a thorough neurocognitive assessment with a range of tasks covering several aspects of executive functioning. Between-group differences in cognition were examined first with multivariate analysis of variance and then with a series of multivariate analyses of covariance, including the schizotypal dimensions as covariates. Results The relatives had higher scores on all schizotypal dimensions compared with controls and poorer planning, problem solving, strategy formation and working memory, irrespective of schizotypal traits. They also scored lower in executive working memory and verbal fluency. The difference in executive working memory was sensitive to the effects of paranoid and negative schizotypy (both dimensions abolished the between-group difference) whereas the difference in verbal fluency was sensitive only to the effects of paranoid schizotypy. Neither cognitive-perceptual nor disorganized schizotypy accounted for any differences in neurocognition between relatives and the controls. Conclusions Impairments in planning, problem solving, strategy formation and working memory are "core" impairments in the schizophrenia-spectrum, possibly due to high heritability effects in these functions. Impairments in executive working memory and verbal fluency are associated with paranoid and negative schizotypy, possibly due to alterations in a common fronto-temporo-parietal neural network.
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Affiliation(s)
- Chrysoula Zouraraki
- Department of Psychology, Faculty of Social Sciences, University of Crete, Rethymno 74100, Crete, Greece
| | - Penny Karamaouna
- Department of Psychology, Faculty of Social Sciences, University of Crete, Rethymno 74100, Crete, Greece
| | - Leda Karagiannopoulou
- Department of Psychology, Faculty of Social Sciences, University of Crete, Rethymno 74100, Crete, Greece
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13
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Spilka MJ, Goghari VM. Similar patterns of brain activation abnormalities during emotional and non-emotional judgments of faces in a schizophrenia family study. Neuropsychologia 2017; 96:164-174. [DOI: 10.1016/j.neuropsychologia.2017.01.014] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/15/2016] [Revised: 01/12/2017] [Accepted: 01/13/2017] [Indexed: 02/01/2023]
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14
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Zhang R, Picchioni M, Allen P, Toulopoulou T. Working Memory in Unaffected Relatives of Patients With Schizophrenia: A Meta-Analysis of Functional Magnetic Resonance Imaging Studies. Schizophr Bull 2016; 42:1068-77. [PMID: 26738528 PMCID: PMC4903055 DOI: 10.1093/schbul/sbv221] [Citation(s) in RCA: 48] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
Working memory deficits, a core cognitive feature of schizophrenia may arise from dysfunction in the frontal and parietal cortices. Numerous studies have also found abnormal neural activation during working memory tasks in patients' unaffected relatives. The aim of this study was to systematically identify and anatomically localize the evidence for those activation differences across all eligible studies. Fifteen functional magnetic resonance imaging (fMRI) manuscripts, containing 16 samples of 289 unaffected relatives of patients with schizophrenia, and 358 healthy controls were identified that met our inclusion criteria: (1) used a working memory task; and (2) reported standard space coordinates. Activation likelihood estimation (ALE) identified convergence across studies. Compared to healthy controls, patients' unaffected relatives showed decreases in neural activation in the right middle frontal gyrus (BA9), as well as right inferior frontal gyrus (BA44). Increased activation was seen in relatives in the right frontopolar (BA10), left inferior parietal lobe (BA40), and thalamus bilaterally. These results suggest that the familial risk of schizophrenia is expressed in changes in neural activation in the unaffected relatives in the cortical-subcortical working memory network that includes, but is not restricted to the middle prefrontal cortex.
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Affiliation(s)
- Ruibin Zhang
- Department of Psychology, The University of Hong Kong, Hong Kong, China
| | - Marco Picchioni
- St Andrew’s Academic Department, Northampton, UK;,Department of Forensic and Neurodevelopmental Science, Institute of Psychiatry, London, UK
| | - Paul Allen
- Department of Psychology, University of Roehampton, London, UK;,Department of Psychosis Studies, Institute of Psychiatry, Psychology and Neuroscience, King’s College London, London, UK
| | - Timothea Toulopoulou
- Department of Psychology, The University of Hong Kong, Hong Kong, China; The State Key Laboratory of Brain and Cognitive Sciences, The University of Hong Kong, Hong Kong, China; Department of Psychology, Bilkent University, Ankara, Turkey; Department of Basic and Clinical Neuroscience, The Institute of Psychiatry, Psychology and Neuroscience, King's College London, London, UK
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15
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Jukuri T, Kiviniemi V, Nikkinen J, Miettunen J, Mäki P, Mukkala S, Koivukangas J, Nordström T, Moilanen I, Barnett JH, Jones PB, Murray GK, Veijola J. Cerebellar activity in young people with familial risk for psychosis--The Oulu Brain and Mind Study. Schizophr Res 2015; 169:46-53. [PMID: 26527249 DOI: 10.1016/j.schres.2015.10.010] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/20/2015] [Revised: 09/30/2015] [Accepted: 10/06/2015] [Indexed: 01/05/2023]
Abstract
OBJECTIVE The cerebellum plays a critical role in cognition and behavior. Altered function of the cerebellum has been related to schizophrenia and psychosis but it is not known how this applies to spontaneous resting state activity in young people with familial risk for psychosis. METHODS We conducted resting-state functional MRI (R-fMRI) in 72 (29 male) young adults with a history of psychosis in one or both parents (FR) but without their own psychosis, and 72 (29 male) similarly healthy control subjects without parental psychosis. Both groups in the Oulu Brain and Mind Study were drawn from the Northern Finland Birth Cohort 1986. Participants were 20-25 years old. Parental psychosis was established using the Care Register for Health Care. R-fMRI data pre-processing was conducted using independent component analysis with 30 and 70 components. A dual regression technique was used to detect between-group differences in the cerebellum with p<0.05 threshold corrected for multiple comparisons. RESULTS FR participants demonstrated statistically significantly increased activity compared to control subjects in the anterior lobe of the right cerebellum in the analysis with 70 components. The volume of the increased activity was 73 mm(3). There was no difference between the groups in the analysis with 30 components. CONCLUSION The finding suggests that increased activity of the anterior lobe of the right cerebellum may be associated with increased vulnerability to psychosis. The finding is novel, and needs replication to be confirmed.
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Affiliation(s)
- Tuomas Jukuri
- Department of Psychiatry, Research Unit of Clinical Neuroscience, University of Oulu, Finland; Department of Psychiatry, Oulu University Hospital, Finland; Thule Doctoral Programme, University of Oulu, Finland.
| | - Vesa Kiviniemi
- Department of Diagnostic Radiology, MIPT, Oulu University Hospital, Finland; Medical Research Center Oulu, Oulu University Hospital and University of Oulu, Finland
| | - Juha Nikkinen
- Medical Research Center Oulu, Oulu University Hospital and University of Oulu, Finland; Department of Oncology and Radiotherapy, Oulu University Hospital, Finland
| | - Jouko Miettunen
- Department of Psychiatry, Research Unit of Clinical Neuroscience, University of Oulu, Finland; Department of Psychiatry, Oulu University Hospital, Finland; Medical Research Center Oulu, Oulu University Hospital and University of Oulu, Finland; Center for Life Course Epidemiology and Systems Medicine, University of Oulu, Finland
| | - Pirjo Mäki
- Department of Psychiatry, Research Unit of Clinical Neuroscience, University of Oulu, Finland; Department of Psychiatry, Oulu University Hospital, Finland; Medical Research Center Oulu, Oulu University Hospital and University of Oulu, Finland; Department of Psychiatry, Länsi-Pohja Healthcare District, Finland; Department of Psychiatry, The Middle Ostrobothnia Central Hospital, Kiuru, Finland; Mental Health Services, Joint Municipal Authority of Wellbeing in Raahe District, Finland; Mental Health Services, Basic Health Care District of Kallio, Finland; Visala Hospital, The Northern Ostrobothnia Hospital District, Finland
| | - Sari Mukkala
- Department of Psychiatry, Research Unit of Clinical Neuroscience, University of Oulu, Finland; Department of Psychiatry, Oulu University Hospital, Finland
| | - Jenni Koivukangas
- Department of Psychiatry, Research Unit of Clinical Neuroscience, University of Oulu, Finland; Thule Doctoral Programme, University of Oulu, Finland
| | - Tanja Nordström
- Medical Research Center Oulu, Oulu University Hospital and University of Oulu, Finland; Center for Life Course Epidemiology and Systems Medicine, University of Oulu, Finland
| | - Irma Moilanen
- Thule Doctoral Programme, University of Oulu, Finland; Department of Child Psychiatry, Oulu University Hospital and University of Oulu, Finland
| | - Jennifer H Barnett
- Department of Psychiatry, University of Cambridge, Cambridgeshire, UK; Cambridge Cognition, Cambridge, UK
| | - Peter B Jones
- Department of Psychiatry, University of Cambridge, Cambridgeshire, UK
| | - Graham K Murray
- Department of Psychiatry, University of Cambridge, Cambridgeshire, UK
| | - Juha Veijola
- Department of Psychiatry, Research Unit of Clinical Neuroscience, University of Oulu, Finland; Department of Psychiatry, Oulu University Hospital, Finland; Thule Doctoral Programme, University of Oulu, Finland; Medical Research Center Oulu, Oulu University Hospital and University of Oulu, Finland
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16
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Park S, Gooding DC. WORKING MEMORY IMPAIRMENT AS AN ENDOPHENOTYPIC MARKER OF A SCHIZOPHRENIA DIATHESIS. SCHIZOPHRENIA RESEARCH-COGNITION 2014; 1:127-136. [PMID: 25414816 PMCID: PMC4234058 DOI: 10.1016/j.scog.2014.09.005] [Citation(s) in RCA: 79] [Impact Index Per Article: 7.9] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
This chapter focuses on the viability of working memory impairment as an endophenotypic marker of a schizophrenia diathesis. It begins with an introduction of the construct of working memory. It follows with a review of the operational criteria for defining an endophenotype. Research findings regarding the working memory performance of schizophrenia and schizophrenia-spectrum patients, first-degree relatives of schizophrenia patients and healthy controls, are reviewed in terms of the criteria for being considered an endophenotypic marker. Special attention is paid to specific components of the working memory deficit (namely, encoding, maintenance, and manipulation), in terms of which aspects are likely to be the best candidates for endophenotypes. We consider the extant literature regarding working memory performance in bipolar disorder and major depression in order to address the issue of relative specificity to schizophrenia. Despite some unresolved issues, it appears that working memory impairment is a very promising candidate for an endophenotypic marker of a schizophrenia diathesis but not for mood disorders. Throughout this chapter, we identify future directions for research in this exciting and dynamic area of research and evaluate the contribution of working memory research to our understanding of schizophrenia.
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Affiliation(s)
- Sohee Park
- Departments of Psychology and Psychiatry, Vanderbilt University, 111, 21st Avenue South, Nashville, TN 37240, USA
- Corresponding authors.
| | - Diane C. Gooding
- Departments of Psychology and Psychiatry, University of Wisconsin-Madison, 1202 West Johnson Street, Madison, WI 53706, USA
- Corresponding authors.
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17
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Montojo C, Ibrahim A, Karlsgodt K, Chow C, Hilton A, Jonas R, Vesagas T, Bearden C. Disrupted working memory circuitry and psychotic symptoms in 22q11.2 deletion syndrome. Neuroimage Clin 2014; 4:392-402. [PMID: 24567911 PMCID: PMC3930118 DOI: 10.1016/j.nicl.2014.01.010] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/04/2013] [Revised: 01/18/2014] [Accepted: 01/21/2014] [Indexed: 11/30/2022]
Abstract
22q11.2 deletion syndrome (22q11DS) is a recurrent genetic mutation that is highly penetrant for psychosis. Behavioral research suggests that 22q11DS patients exhibit a characteristic neurocognitive phenotype that includes differential impairment in spatial working memory (WM). Notably, spatial WM has also been proposed as an endophenotype for idiopathic psychotic disorder, yet little is known about the neurobiological substrates of WM in 22q11DS. In order to investigate the neural systems engaged during spatial WM in 22q11DS patients, we collected functional magnetic resonance imaging (fMRI) data while 41 participants (16 22q11DS patients, 25 demographically matched controls) performed a spatial capacity WM task that included manipulations of delay length and load level. Relative to controls, 22q11DS patients showed reduced neural activation during task performance in the intraparietal sulcus (IPS) and superior frontal sulcus (SFS). In addition, the typical increases in neural activity within spatial WM-relevant regions with greater memory load were not observed in 22q11DS. We further investigated whether neural dysfunction during WM was associated with behavioral WM performance, assessed via the University of Maryland letter-number sequencing (LNS) task, and positive psychotic symptoms, assessed via the Structured Interview for Prodromal Syndromes (SIPS), in 22q11DS patients. WM load activity within IPS and SFS was positively correlated with LNS task performance; moreover, WM load activity within IPS was inversely correlated with the severity of unusual thought content and delusional ideas, indicating that decreased recruitment of working memory-associated neural circuitry is associated with more severe positive symptoms. These results suggest that 22q11DS patients show reduced neural recruitment of brain regions critical for spatial WM function, which may be related to characteristic behavioral manifestations of the disorder.
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Affiliation(s)
- C.A. Montojo
- Semel Institute for Neuroscience and Human Behavior, 760 Westwood Plaza, University of California, Los Angeles, Los Angeles, CA 90095, USA
- Department of Psychology, 1285 Franz Hall, University of California, Los Angeles, Los Angeles, CA 90095, USA
| | - A. Ibrahim
- Semel Institute for Neuroscience and Human Behavior, 760 Westwood Plaza, University of California, Los Angeles, Los Angeles, CA 90095, USA
| | - K.H. Karlsgodt
- Feinstein Institute for Medical Research, Zucker Hillside Hospital, North Shore-LIJ Health System, 350 Community Drive, Manhasset, NY 11030, USA
| | - C. Chow
- Semel Institute for Neuroscience and Human Behavior, 760 Westwood Plaza, University of California, Los Angeles, Los Angeles, CA 90095, USA
| | - A.E. Hilton
- Department of Psychology, 1285 Franz Hall, University of California, Los Angeles, Los Angeles, CA 90095, USA
| | - R.K. Jonas
- Semel Institute for Neuroscience and Human Behavior, 760 Westwood Plaza, University of California, Los Angeles, Los Angeles, CA 90095, USA
| | - T.K. Vesagas
- Semel Institute for Neuroscience and Human Behavior, 760 Westwood Plaza, University of California, Los Angeles, Los Angeles, CA 90095, USA
| | - C.E. Bearden
- Semel Institute for Neuroscience and Human Behavior, 760 Westwood Plaza, University of California, Los Angeles, Los Angeles, CA 90095, USA
- Department of Psychology, 1285 Franz Hall, University of California, Los Angeles, Los Angeles, CA 90095, USA
- Brain Research Institute, 695 Charles E Young Drive S, University of California, Los Angeles, Los Angeles, CA 90095, USA
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18
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Smieskova R, Marmy J, Schmidt A, Bendfeldt K, Riecher-Rӧssler A, Walter M, Lang UE, Borgwardt S. Do subjects at clinical high risk for psychosis differ from those with a genetic high risk?--A systematic review of structural and functional brain abnormalities. Curr Med Chem 2014; 20:467-81. [PMID: 23157639 PMCID: PMC3580804 DOI: 10.2174/0929867311320030018] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/01/2012] [Revised: 10/25/2012] [Accepted: 10/30/2012] [Indexed: 11/22/2022]
Abstract
Introduction: Pre-psychotic and early psychotic characteristics are investigated in the high-risk (HR) populations for psychosis. There are two different approaches based either on hereditary factors (genetic high risk, G-HR) or on the clinically manifested symptoms (clinical high risk, C-HR). Common features are an increased risk for development of psychosis and similar cognitive as well as structural and functional brain abnormalities. Methods: We reviewed the existing literature on longitudinal structural, and on functional imaging studies, which included G-HR and/or C-HR individuals for psychosis, healthy controls (HC) and/or first episode of psychosis (FEP) or schizophrenia patients (SCZ). Results: With respect to structural brain abnormalities, vulnerability to psychosis was associated with deficits in frontal, temporal, and cingulate regions in HR, with additional insular and caudate deficits in C-HR population. Furthermore, C-HR had progressive prefrontal deficits related to the transition to psychosis. With respect to functional brain abnormalities, vulnerability to psychosis was associated with prefrontal, cingulate and middle temporal abnormalities in HR, with additional parietal, superior temporal, and insular abnormalities in C-HR population. Transition-to-psychosis related differences emphasized prefrontal, hippocampal and striatal components, more often detectable in C-HR population. Multimodal studies directly associated psychotic symptoms displayed in altered prefrontal and hippocampal activations with striatal dopamine and thalamic glutamate functions. Conclusion: There is an evidence for similar structural and functional brain abnormalities within the whole HR population, with more pronounced deficits in the C-HR population. The most consistent evidence for abnormality in the prefrontal cortex reported in structural, functional and multimodal studies of HR population may underlie the complexity of higher cognitive functions that are impaired during HR mental state for psychosis.
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Affiliation(s)
- R Smieskova
- Department of Psychiatry, University of Basel, c/o University Hospital Basel, Petersgraben 4, Basel 4031, Switzerland.
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Self-disturbances as a possible premorbid indicator of schizophrenia risk: a neurodevelopmental perspective. Schizophr Res 2014; 152:73-80. [PMID: 23932148 PMCID: PMC3877695 DOI: 10.1016/j.schres.2013.07.038] [Citation(s) in RCA: 55] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/04/2013] [Revised: 07/17/2013] [Accepted: 07/19/2013] [Indexed: 02/07/2023]
Abstract
Self-disturbances (SDs) are increasingly identified in schizophrenia and are theorized to confer vulnerability to psychosis. Neuroimaging research has shed some light on the neural correlates of SDs in schizophrenia. But, the onset and trajectory of the neural alterations underlying SDs in schizophrenia remain incompletely understood. We hypothesize that the aberrant structure and function of brain areas (e.g., prefrontal, lateral temporal, and parietal cortical structures) comprising the "neural circuitry of self" may represent an early, premorbid (i.e., pre-prodromal) indicator of schizophrenia risk. Consistent with neurodevelopmental models, we argue that "early" (i.e., perinatal) dysmaturational processes (e.g., abnormal cortical neural cell migration and mini-columnar formation) affecting key prefrontal (e.g., medial prefrontal cortex), lateral temporal cortical (e.g., superior temporal sulcus), and parietal (e.g., inferior parietal lobule) structures involved in self-processing may lead to subtle disruptions of "self" during childhood in persons at risk for schizophrenia. During adolescence, progressive neurodevelopmental alterations (e.g., aberrant synaptic pruning) affecting the neural circuitry of self may contribute to worsening of SDs. This could result in the emergence of prodromal symptoms and, eventually, full-blown psychosis. To highlight why adolescence may be a period of heightened risk for SDs, we first summarize the literature regarding the neural correlates of self in typically developing children. Next, we present evidence from neuroimaging studies in genetic high-risk youth suggesting that fronto-temporal-parietal structures mediating self-reflection may be abnormal in the premorbid period. Our goal is that the ideas presented here might provide future directions for research into the neurobiology of SDs during the pre-psychosis development of youth at risk for schizophrenia.
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20
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Lins BR, Ballendine SA, Howland JG. Altered object exploration but not temporal order memory retrieval in an object recognition test following treatment of rats with the group II metabotropic glutamate receptor agonist LY379268. Neurosci Lett 2013; 560:41-5. [PMID: 24361135 DOI: 10.1016/j.neulet.2013.12.016] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/01/2013] [Revised: 12/08/2013] [Accepted: 12/10/2013] [Indexed: 10/25/2022]
Abstract
Temporal order memory refers to the ability to distinguish past experiences in the order that they occurred. Temporal order memory for objects is often tested in rodents using spontaneous object recognition paradigms. The circuitry mediating memory in these tests is distributed and involves ionotropic glutamate receptors in the perirhinal cortex and medial prefrontal cortex. It is unknown what role, if any, metabotropic glutamate receptors have in temporal order memory for objects. The present experiment examined the role of metabotropic glutamate receptors in temporal memory retrieval using the group II metabotropic glutamate receptor selective agonist LY379268. Rats were trained on a temporal memory test with three phases: two sample phases (60 min between them) in which rats explored two novel objects and a test phase (60 min after the second sample phase) which included a copy of each object previously encountered. Under these conditions, we confirmed that rats showed a significant exploratory preference for the object presented during the first sample phase. In a second experiment, we found that LY379268 (0.3, 1.0, or 3.0mg/kg; i.p.; 30 min before the test phase) had no effect on temporal memory retrieval but dose-dependently reduced time spent exploring the objects. Our results show that enhancing mGluR2 activity under conditions when TM is intact does not influence memory retrieval.
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Affiliation(s)
- Brittney R Lins
- Department of Physiology, University of Saskatchewan, GB33, Health Sciences Building, 107 Wiggins Road, Saskatoon, SK S7N 5E5, Canada
| | - Stephanie A Ballendine
- Department of Physiology, University of Saskatchewan, GB33, Health Sciences Building, 107 Wiggins Road, Saskatoon, SK S7N 5E5, Canada
| | - John G Howland
- Department of Physiology, University of Saskatchewan, GB33, Health Sciences Building, 107 Wiggins Road, Saskatoon, SK S7N 5E5, Canada.
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de Leeuw M, Kahn RS, Zandbelt BB, Widschwendter CG, Vink M. Working memory and default mode network abnormalities in unaffected siblings of schizophrenia patients. Schizophr Res 2013; 150:555-62. [PMID: 24051015 DOI: 10.1016/j.schres.2013.08.016] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/17/2012] [Revised: 08/06/2013] [Accepted: 08/15/2013] [Indexed: 10/26/2022]
Abstract
BACKGROUND Impaired working memory (WM) is a hallmark of schizophrenia. In addition to classical WM regions such as the dorsolateral prefrontal cortex (DLPFC) and the striatum, dysfunctions in the default-mode network (DMN) contribute to these WM deficits. Unaffected siblings of patients also show WM impairments. However, the nature of the functional deficits underlying these impairments is unclear, mainly because of impaired performance confounding neuroimaging results. METHODS Here, we investigated WM and DMN activity in 23 unaffected siblings of schizophrenia patients and 24 healthy volunteers using fMRI and a Sternberg WM task. WM load was determined prior to scanning to ensure 90% accuracy for all subjects. RESULTS Siblings showed hyperactivation during the encoding phase of WM in the right medial prefrontal cortex (MPFC) which is the anterior part of the DMN. No differences were found during the maintenance phase. During the retrieval phase, siblings showed hyperactivation in WM regions: DLPFC, inferior parietal cortex and the striatum. Siblings who showed hyperactivity in the MPFC during encoding showed DLPFC and striatum hyperactivation during retrieval. CONCLUSIONS Our finding of hyperactivation in WM and DMN areas indicates that siblings fail to adequately inhibit DMN activity during demanding cognitive tasks and subsequently hyperactivate WM areas. This failure may reflect dopamine hyperactivity in the striatum which prevents adequate DMN suppression needed for effective WM. This study provides support for the notion that aberrant WM and DMN activation patterns may represent candidate endophenotypes for schizophrenia.
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Affiliation(s)
- Max de Leeuw
- Brain Center Rudolf Magnus, Department of Psychiatry, University Medical Center Utrecht, Utrecht, the Netherlands.
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22
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Dudchenko PA, Talpos J, Young J, Baxter MG. Animal models of working memory: A review of tasks that might be used in screening drug treatments for the memory impairments found in schizophrenia. Neurosci Biobehav Rev 2013; 37:2111-24. [PMID: 22464948 DOI: 10.1016/j.neubiorev.2012.03.003] [Citation(s) in RCA: 91] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/17/2011] [Revised: 02/17/2012] [Accepted: 03/05/2012] [Indexed: 12/18/2022]
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23
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Thermenos HW, Keshavan MS, Juelich RJ, Molokotos E, Whitfield-Gabrieli S, Brent BK, Makris N, Seidman LJ. A review of neuroimaging studies of young relatives of individuals with schizophrenia: a developmental perspective from schizotaxia to schizophrenia. Am J Med Genet B Neuropsychiatr Genet 2013; 162B:604-35. [PMID: 24132894 DOI: 10.1002/ajmg.b.32170] [Citation(s) in RCA: 83] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/30/2013] [Accepted: 04/24/2013] [Indexed: 11/08/2022]
Abstract
In an effort to identify the developing abnormalities preceding psychosis, Dr. Ming T. Tsuang and colleagues at Harvard expanded Meehl's concept of "schizotaxia," and examined brain structure and function in families affected by schizophrenia (SZ). Here, we systematically review genetic (familial) high-risk (HR) studies of SZ using magnetic resonance imaging (MRI), examine how findings inform models of SZ etiology, and suggest directions for future research. Neuroimaging studies of youth at HR for SZ through the age of 30 were identified through a MEDLINE (PubMed) search. There is substantial evidence of gray matter volume abnormalities in youth at HR compared to controls, with an accelerated volume reduction over time in association with symptoms and cognitive deficits. In structural neuroimaging studies, prefrontal cortex (PFC) alterations were the most consistently reported finding in HR. There was also consistent evidence of smaller hippocampal volume. In functional studies, hyperactivity of the right PFC during performance of diverse tasks with common executive demands was consistently reported. The only longitudinal fMRI study to date revealed increasing left middle temporal activity in association with the emergence of psychotic symptoms. There was preliminary evidence of cerebellar and default mode network alterations in association with symptoms. Brain abnormalities in structure, function and neurochemistry are observed in the premorbid period in youth at HR for SZ. Future research should focus on the genetic and environmental contributions to these alterations, determine how early they emerge, and determine whether they can be partially or fully remediated by innovative treatments.
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Affiliation(s)
- H W Thermenos
- Harvard Medical School, Boston, Massachusetts; Massachusetts Mental Health Center, Division of Public Psychiatry, Boston, Massachusetts; Department of Psychiatry, Beth Israel Deaconess Medical Center, Boston, Massachusetts; Department of Psychiatry, Massachusetts General Hospital, Boston, Massachusetts
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24
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Goghari VM, Smith GN, Honer WG, Kopala LC, Thornton AE, Su W, Macewan GW, Lang DJ. Effects of eight weeks of atypical antipsychotic treatment on middle frontal thickness in drug-naïve first-episode psychosis patients. Schizophr Res 2013; 149:149-55. [PMID: 23830856 DOI: 10.1016/j.schres.2013.06.025] [Citation(s) in RCA: 45] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/07/2013] [Revised: 06/07/2013] [Accepted: 06/10/2013] [Indexed: 10/26/2022]
Abstract
Atypical antipsychotic medications generally maintain or increase gray matter amount and functioning. First-episode psychosis patients have lower gray matter volume in the middle frontal gyrus, as well as worse performance on spatial working memory tasks compared to controls. This study investigated the effects of short-term four- and eight-week atypical treatment on middle frontal thickness and spatial working memory in first-episode psychosis patients. Nineteen drug-naïve first-episode psychosis patients treated with risperidone or quetiapine and 26 controls completed structural magnetic resonance imaging, a spatial working memory task, and clinical assessment at three intervals (baseline, four weeks, and eight weeks; all patients and 23 controls completed all three assessments). Caudal and rostral middle frontal thicknesses were measured using the automated program Freesurfer. Positive, negative, and general symptoms of the Positive and Negative Syndrome Scale (PANSS) decreased significantly in patients, with most of the change occurring in the first four weeks of treatment. Patients demonstrated an increase in rostral middle frontal thickness over eight weeks of treatment compared to controls. There was a medium effect size relationship between reduction in negative symptoms at four and eight weeks, and a change in rostral middle frontal thickness over eight weeks. No changes were found in spatial working memory ability. Short-term atypical treatment with risperidone or quetiapine can increase prefrontal cortical thickness in psychosis. These findings are notable given the role of the rostral middle frontal region in cognition and the relationship between better cognitive functioning and better functional outcome in psychosis.
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Affiliation(s)
- Vina M Goghari
- Department of Psychology, Hotchkiss Brain Institute, University of Calgary, 2500 University Drive NW, Calgary, AB T2N 1N4, Canada.
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25
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Rawdon C, Murphy J, Blanchard MM, Kelleher I, Clarke MC, Kavanagh F, Cannon M, Roche RAP. Reduced P300 amplitude during retrieval on a spatial working memory task in a community sample of adolescents who report psychotic symptoms. BMC Psychiatry 2013; 13:125. [PMID: 23634909 PMCID: PMC3666949 DOI: 10.1186/1471-244x-13-125] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/21/2012] [Accepted: 04/20/2013] [Indexed: 11/13/2022] Open
Abstract
BACKGROUND Deficits in working memory are widely reported in schizophrenia and are considered a trait marker for the disorder. Event-related potentials (ERPs) and imaging data suggest that these differences in working memory performance may be due to aberrant functioning in the prefrontal and parietal cortices. Research suggests that many of the same risk factors for schizophrenia are shared with individuals from the general population who report psychotic symptoms. METHODS Forty-two participants (age range 11-13 years) were divided into those who reported psychotic symptoms (N = 17) and those who reported no psychotic symptoms, i.e. the control group (N = 25). Behavioural differences in accuracy and reaction time were explored between the groups as well as electrophysiological correlates of working memory using a Spatial Working Memory Task, which was a variant of the Sternberg paradigm. Specifically, differences in the P300 component were explored across load level (low load and high load), location (positive probe i.e. in the same location as shown in the study stimulus and negative probe i.e. in a different location to the study stimulus) and between groups for the overall P300 timeframe. The effect of load was also explored at early and late timeframes of the P300 component (250-430 ms and 430-750 ms respectively). RESULTS No between-group differences in the behavioural data were observed. Reduced amplitude of the P300 component was observed in the psychotic symptoms group relative to the control group at posterior electrode sites. Amplitude of the P300 component was reduced at high load for the late P300 timeframe at electrode sites Pz and POz. CONCLUSIONS These results identify neural correlates of neurocognitive dysfunction associated with population level psychotic symptoms and provide insights into ERP abnormalities associated with the extended psychosis phenotype.
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Affiliation(s)
- Caroline Rawdon
- Department of Psychology, National University of Ireland, Maynooth, Co. Kildare, Ireland
| | - Jennifer Murphy
- Department of Psychology, National University of Ireland, Maynooth, Co. Kildare, Ireland,Department of Psychiatry, Royal College of Surgeons in Ireland, Dublin, Ireland
| | - Mathieu M Blanchard
- Department of Psychiatry, Royal College of Surgeons in Ireland, Dublin, Ireland
| | - Ian Kelleher
- Department of Psychiatry, Royal College of Surgeons in Ireland, Dublin, Ireland
| | - Mary C Clarke
- Department of Psychiatry, Royal College of Surgeons in Ireland, Dublin, Ireland
| | - Fergal Kavanagh
- Department of Psychiatry, Royal College of Surgeons in Ireland, Dublin, Ireland
| | - Mary Cannon
- Department of Psychiatry, Royal College of Surgeons in Ireland, Dublin, Ireland,Department of Psychiatry, Beaumont Hospital, Dublin 9, Ireland
| | - Richard AP Roche
- Department of Psychology, National University of Ireland, Maynooth, Co. Kildare, Ireland
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26
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Linden DE, Lancaster TM, Wolf C, Baird A, Jackson MC, Johnston SJ, Donev R, Thome J. ZNF804A genotype modulates neural activity during working memory for faces. Neuropsychobiology 2013; 67:84-92. [PMID: 23295962 PMCID: PMC3928999 DOI: 10.1159/000344001] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/27/2012] [Accepted: 09/29/2012] [Indexed: 01/20/2023]
Abstract
BACKGROUND Genetic susceptibility to schizophrenia (SZ) has been suggested to influence the cortical systems supporting working memory (WM) and face processing. Genetic imaging studies link the SZ risk variant rs1344706 on the ZNF804A gene to psychosis via alterations in functional brain connectivity during WM, but no work has looked at the effects of ZNF804A on WM with face-processing components. METHODS We therefore investigated healthy controls that were genotyped for rs1344706 with a face WM task during functional magnetic resonance imaging. We suggested that variation at the rs1344706 locus would be associated with similar alterations as patients previously tested using the same WM task for faces. RESULTS The rs1344706 risk allele was indeed associated with altered activation in the right dorsolateral prefrontal (rDLPFC) cortex. We established that the rDLPFC was activated in a task-dependent manner, suggesting that the differences in activation between rs1344706 genotype groups reflected alterations in task processing. Furthermore, we demonstrated that the rDLPFC region showed significant volumetric overlap with the rDLPFC which had previously been reported to be altered during task processing for patients with SZ. CONCLUSIONS The findings support an association between rs1344706 and alterations in DLPFC activity during WM for faces. We further suggest that WM for faces may be a useful intermediate phenotype in the investigation of genetic susceptibility to psychosis.
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Affiliation(s)
- David E.J. Linden
- MRC Centre for Neuropsychiatric Genetics and Genomics, Cardiff University, Cardiff, Bangor, UK,Neuroscience and Mental Health Research Institute, Cardiff University, Cardiff, Bangor, UK,David E.J. Linden, MRC Centre for Neuropsychiatric Genetics and Genomics, Cardiff University, Cardiff CF14 4XN (UK), E-Mail LindenD©cardiff.ac.uk
| | - Thomas M. Lancaster
- MRC Centre for Neuropsychiatric Genetics and Genomics, Cardiff University, Cardiff, Bangor, UK,School of Medical Sciences Neuroscience, School of Psychology, Bangor University, Bangor, UK
| | - Claudia Wolf
- Wolfson Centre for Cognitive and Clinical Neuroscience, School of Psychology, Bangor University, Bangor, UK
| | - Alison Baird
- Laboratory of Molecular Psychiatry and Pharmacology, Institute of Life Science, School of Medicine, Swansea, UK
| | - Margaret C. Jackson
- Wolfson Centre for Cognitive and Clinical Neuroscience, School of Psychology, Bangor University, Bangor, UK
| | | | - Rossen Donev
- Laboratory of Molecular Psychiatry and Pharmacology, Institute of Life Science, School of Medicine, Swansea, UK
| | - Johannes Thome
- Department of Psychiatry and Psychotherapy, University of Rostock, Rostock, Germany
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27
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Silverstein SM, Wang Y, Keane BP. Cognitive and neuroplasticity mechanisms by which congenital or early blindness may confer a protective effect against schizophrenia. Front Psychol 2013; 3:624. [PMID: 23349646 PMCID: PMC3552473 DOI: 10.3389/fpsyg.2012.00624] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/03/2012] [Accepted: 12/31/2012] [Indexed: 12/12/2022] Open
Abstract
Several authors have noted that there are no reported cases of people with schizophrenia who were born blind or who developed blindness shortly after birth, suggesting that congenital or early (C/E) blindness may serve as a protective factor against schizophrenia. By what mechanisms might this effect operate? Here, we hypothesize that C/E blindness offers protection by strengthening cognitive functions whose impairment characterizes schizophrenia, and by constraining cognitive processes that exhibit excessive flexibility in schizophrenia. After briefly summarizing evidence that schizophrenia is fundamentally a cognitive disorder, we review areas of perceptual and cognitive function that are both impaired in the illness and augmented in C/E blindness, as compared to healthy sighted individuals. We next discuss: (1) the role of neuroplasticity in driving these cognitive changes in C/E blindness; (2) evidence that C/E blindness does not confer protective effects against other mental disorders; and (3) evidence that other forms of C/E sensory loss (e.g., deafness) do not reduce the risk of schizophrenia. We conclude by discussing implications of these data for designing cognitive training interventions to reduce schizophrenia-related cognitive impairment, and perhaps to reduce the likelihood of the development of the disorder itself.
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Affiliation(s)
- Steven M. Silverstein
- University Behavioral HealthCare, University of Medicine and Dentistry of New JerseyPiscataway, NJ, USA
- Department of Psychiatry, University of Medicine and Dentistry of New Jersey, Robert Wood Johnson Medical SchoolPiscataway, NJ, USA
| | - Yushi Wang
- University Behavioral HealthCare, University of Medicine and Dentistry of New JerseyPiscataway, NJ, USA
| | - Brian P. Keane
- University Behavioral HealthCare, University of Medicine and Dentistry of New JerseyPiscataway, NJ, USA
- Department of Psychiatry, University of Medicine and Dentistry of New Jersey, Robert Wood Johnson Medical SchoolPiscataway, NJ, USA
- Rutgers University Center for Cognitive SciencePiscataway, NJ, USA
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28
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Potential risk for healthy siblings to develop schizophrenia: evidence from pattern classification with whole-brain connectivity. Neuroreport 2012; 23:265-9. [PMID: 22158134 DOI: 10.1097/wnr.0b013e32834f60a5] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
Recent resting-state functional connectivity MRI studies using group-level statistical analysis have demonstrated the inheritable characters of schizophrenia. The objective of the present study was to use pattern classification as a means to investigate schizophrenia inheritance based on the whole-brain resting-state functional connectivity at the individual subject level. One-against-one pattern classifications were made amongst three groups (i.e. patients diagnosed with schizophrenia, healthy siblings, and healthy controls after preprocessing), resulting in an 80.4% separation between patients with schizophrenia and healthy controls, a 77.6% separation between schizophrenia patients and their healthy siblings, and a 78.7% separation between healthy siblings and healthy controls, respectively. These results suggest that the healthy siblings of schizophrenia patients have an altered resting-state functional connectivity pattern compared with healthy controls. Thus, healthy siblings may have a potential higher risk for developing schizophrenia compared with the general population. Moreover, this pattern differed from that of schizophrenia patients and may contribute to the normal behavior exhibition of healthy siblings in daily life.
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29
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Leonard CJ, Kaiser ST, Robinson BM, Kappenman ES, Hahn B, Gold JM, Luck SJ. Toward the neural mechanisms of reduced working memory capacity in schizophrenia. Cereb Cortex 2012; 23:1582-92. [PMID: 22661407 DOI: 10.1093/cercor/bhs148] [Citation(s) in RCA: 64] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
People with schizophrenia (PSZ) demonstrate reliable reductions in working memory (WM) capacity (i.e., the number of objects that can be held in memory). The present study asked whether WM impairments in PSZ can be explained by the same neural mechanisms that underlie individual differences in WM capacity among healthy individuals. Specifically, we examined event-related potentials in PSZ and healthy matched controls during a change detection task that required the storage of multiple objects in WM. The amplitude of contralateral delay activity (CDA), which correlates with WM capacity in healthy individuals, was larger in controls than in PSZ for memory loads of 3 and 5 objects, but larger in PSZ than in controls for a memory load of 1. This same pattern was found in the subgroups of PSZ and controls with an equivalent WM capacity. Moreover, the increase in CDA amplitude was correlated with individual differences in capacity in controls, but not in PSZ. These results demonstrate that WM impairment in PSZ is not associated with the same patterns of neural activity that characterize low WM capacity in healthy individuals. We propose that WM impairment in PSZ instead reflects a specific impairment in the ability to distribute attention broadly.
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Affiliation(s)
- Carly J Leonard
- Department of Psychology, Center for Mind and Brain, University of California, Davis, CA 95618, USA.
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30
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Structure-function relationship of working memory activity with hippocampal and prefrontal cortex volumes. Brain Struct Funct 2012; 218:173-86. [PMID: 22362200 DOI: 10.1007/s00429-012-0391-8] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/07/2011] [Accepted: 01/31/2012] [Indexed: 10/28/2022]
Abstract
A rapidly increasing number of studies are quantifying the system-level network architecture of the human brain based on structural-to-structural and functional-to-functional relationships. However, a largely unexplored area is the nature and existence of "cross-modal" structural-functional relationships, in which, for example, the volume (or other morphological property) of one brain region is related to the functional response to a given task either in that same brain region, or another brain region. The present study investigated whether the gray matter volume of a selected group of structures (superior, middle, and inferior frontal gyri, thalamus, and hippocampus) was correlated with the fMRI response to a working memory task, within a mask of regions previously identified as involved with working memory. The subjects included individuals with schizophrenia, their siblings, and healthy controls (n = 154 total). Using rigorous permutation testing to define the null distribution, we found that the volume of the superior and middle frontal gyri was correlated with working memory activity within clusters in the intraparietal sulcus (i.e., dorsal parietal cortex) and that the volume of the hippocampus was correlated with working memory activity within clusters in the dorsal anterior cingulate cortex and left inferior frontal gyrus. However, we did not find evidence that the identified structure-function relationships differed between subject groups. These results show that long-distance structural-functional relationships exist within the human brain. The study of such cross-modal relationships represents an additional approach for studying systems-level interregional brain networks.
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31
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Thormodsen R, Jensen J, Holmèn A, Juuhl-Langseth M, Emblem KE, Andreassen OA, Rund BR. Prefrontal hyperactivation during a working memory task in early-onset schizophrenia spectrum disorders: an fMRI study. Psychiatry Res 2011; 194:257-262. [PMID: 22079661 DOI: 10.1016/j.pscychresns.2011.05.011] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/14/2010] [Revised: 05/16/2011] [Accepted: 05/25/2011] [Indexed: 10/15/2022]
Abstract
Working memory (WM) dysfunction is increasingly recognized as a core feature of schizophrenia, but few studies have investigated prefrontal activation during WM tasks in early-onset schizophrenia spectrum disorder (EOS). Our aim was to explore prefrontal activation during a WM-task in EOS patients compared to healthy controls using functional magnetic resonance imaging (fMRI). Fifteen patients with EOS and 15 matched healthy controls performed a 0-back and a 2-back task while fMRI data were acquired. Results indicated that even though performance between patients and controls was comparable on both tasks, there was a hyperactivation in patients' ventrolateral prefrontal cortex (VLPFC) during the 2-back task compared to healthy controls. This pattern of activation suggests that, in patients with EOS, the VLPFC compensated in order to match performance of the controls. The activations in the EOS group may reflect the use of a compensatory, cognitive strategy while solving WM-tasks.
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Affiliation(s)
- Rune Thormodsen
- Vestre Viken Hospital Trust, 1309 Rud, Oslo, Norway; Department of Psychology, University of Oslo, Norway.
| | - Jimmy Jensen
- Department of Psychiatry, Oslo University Hospital, Norway; Institute of Psychiatry, University of Oslo, Norway; Department of Psychiatry and Psychotherapy, Charité Universitätsmedizin, Berlin, Germany.
| | - Aina Holmèn
- Department of Psychology, University of Oslo, Norway; Akershus University Hospital, Mental Health Division, Norway.
| | - Monica Juuhl-Langseth
- Department of Psychology, University of Oslo, Norway; Research unit Sogn, Oslo University Hospital, Norway.
| | - Kyrre Eeg Emblem
- The Interventional Centre, Rikshospitalet, Oslo University Hospital, Norway; Department of Medical Physics, Rikshospitalet, Oslo University Hospital, Norway.
| | - Ole Andreas Andreassen
- Department of Psychiatry, Oslo University Hospital, Norway; Institute of Psychiatry, University of Oslo, Norway.
| | - Bjørn Rishovd Rund
- Vestre Viken Hospital Trust, 1309 Rud, Oslo, Norway; Department of Psychology, University of Oslo, Norway.
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Rominger C, Weiss EM, Fink A, Schulter G, Papousek I. Allusive thinking (cognitive looseness) and the propensity to perceive “meaningful” coincidences. PERSONALITY AND INDIVIDUAL DIFFERENCES 2011. [DOI: 10.1016/j.paid.2011.08.012] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Wolf C, Linden S, Jackson MC, Healy D, Baird A, Linden DEJ, Thome J. Brain activity supporting working memory accuracy in patients with paranoid schizophrenia: a functional magnetic resonance imaging study. Neuropsychobiology 2011; 64:93-101. [PMID: 21701227 DOI: 10.1159/000323800] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/25/2010] [Accepted: 12/20/2010] [Indexed: 11/19/2022]
Abstract
BACKGROUND Dysfunctional working memory (WM) has been recognized as one of the most consistent deficits in schizophrenia. Studies that investigated the neural correlates of WM-related pathology by comparing patients with schizophrenia and control participants have produced controversial results, reporting task-related hyper- or hypoactivity in frontoparietal networks. METHOD We addressed this question by comparing BOLD signals for accurate responses during a WM task for emotional faces between a homogeneous group of high-performing patients and a control group. RESULTS Our results confirm previous findings of left prefrontal hyperactivity contrasted with hypoactivity in right prefrontal cortex to support WM performance. We also extend previous work by reporting enhanced activity in higher visual areas of patients during encoding and maintenance. CONCLUSION Our findings and those of the literature can be integrated into a model, where preserved visual cognition in high-functioning patients with hypofrontality is explained by activation of contralateral homologue areas combined with enhanced recruitment of sensory areas.
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Affiliation(s)
- Claudia Wolf
- Wolfson Centre for Cognitive and Clinical Neuroscience, School of Psychology, Bangor University, Bangor, UK
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34
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Smith MJ, Wang L, Cronenwett W, Goldman MB, Mamah D, Barch DM, Csernansky JG. Alcohol use disorders contribute to hippocampal and subcortical shape differences in schizophrenia. Schizophr Res 2011; 131:174-83. [PMID: 21658914 PMCID: PMC3159796 DOI: 10.1016/j.schres.2011.05.014] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/25/2011] [Revised: 05/11/2011] [Accepted: 05/18/2011] [Indexed: 12/25/2022]
Abstract
BACKGROUND Alcohol abuse and dependence have been reported to exacerbate the clinical course of schizophrenia. However, the neurobiological basis of this co-morbid interaction is unknown. The aim of this study was to determine the relationship of co-morbid alcohol use disorder (AUD) with brain structure abnormalities in schizophrenia patients. METHODS T1-weighted magnetic resonance images were collected from schizophrenia patients without a history of any substance use disorder (SCZ_0, n=35), schizophrenia patients with a history of AUD only (SCZ_AUD, n=16), and a healthy comparison group without a history of any substance use disorder (CON, n=56). Large-deformation, high-dimensional brain mapping was used to quantify the surface shapes of the hippocampus, thalamus, striatum, and globus pallidus in these subject groups. Analysis of variance was used to test for differences in surface shape measures among the groups. RESULTS SCZ_AUD demonstrated the greatest severity of shape abnormalities in the hippocampus, thalamus, striatum, and globus pallidus as compared to SCZ_0 and CON. SCZ_AUD demonstrated a combination of exaggerated shape differences in regions where SCZ_0 also showed shape differences, and unique shape differences that were not observed in SCZ_0 or CON. CONCLUSIONS Shape differences in schizophrenia were compounded by a history of co-morbid AUD. Future research is needed to determine whether these differences are simply additive or whether they are due to an interaction between the underlying neurobiology of schizophrenia and alcoholism. The consequences of such shape differences for the clinical course of schizophrenia are not yet understood.
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Affiliation(s)
- Matthew J. Smith
- Northwestern University Feinberg School of Medicine, Department of Psychiatry and Behavioral Sciences
| | - Lei Wang
- Northwestern University Feinberg School of Medicine, Department of Psychiatry and Behavioral Sciences,Northwestern University Feinberg School of Medicine, Department of Radiology
| | - Will Cronenwett
- Northwestern University Feinberg School of Medicine, Department of Psychiatry and Behavioral Sciences
| | - Morris B. Goldman
- Northwestern University Feinberg School of Medicine, Department of Psychiatry and Behavioral Sciences
| | | | - Deanna M. Barch
- Washington University, Department of Psychiatry,Washington University, Department of Psychology,Washington University, Department of Radiology
| | - John G. Csernansky
- Northwestern University Feinberg School of Medicine, Department of Psychiatry and Behavioral Sciences
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Barr MS, Farzan F, Arenovich T, Chen R, Fitzgerald PB, Daskalakis ZJ. The effect of repetitive transcranial magnetic stimulation on gamma oscillatory activity in schizophrenia. PLoS One 2011; 6:e22627. [PMID: 21818354 PMCID: PMC3144924 DOI: 10.1371/journal.pone.0022627] [Citation(s) in RCA: 60] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/26/2010] [Accepted: 07/01/2011] [Indexed: 11/19/2022] Open
Abstract
Background Gamma (γ) oscillations (30–50 Hz) have been shown to be excessive in patients with schizophrenia (SCZ) during working memory (WM). WM is a cognitive process that involves the online maintenance and manipulation of information that is mediated largely by the dorsolateral prefrontal cortex (DLPFC). Repetitive transcranial magnetic stimulation (rTMS) represents a non-invasive method to stimulate the cortex that has been shown to enhance cognition and γ oscillatory activity during WM. Methodology and Principal Findings We examined the effect of 20 Hz rTMS over the DLPFC on γ oscillatory activity elicited during the N-back task in 24 patients with SCZ compared to 22 healthy subjects. Prior to rTMS, patients with SCZ elicited excessive γ oscillatory activity compared to healthy subjects across WM load. Active rTMS resulted in the reduction of frontal γ oscillatory activity in patients with SCZ, while potentiating activity in healthy subjects in the 3-back, the most difficult condition. Further, these effects on γ oscillatory activity were found to be specific to the frontal brain region and were absent in the parieto-occipital brain region. Conclusions and Significance We suggest that this opposing effect of rTMS on γ oscillatory activity in patients with SCZ versus healthy subjects may be related to homeostatic plasticity leading to differential effects of rTMS on γ oscillatory activity depending on baseline differences. These findings provide important insights into the neurophysiological mechanisms underlying WM deficits in SCZ and demonstrated that rTMS can modulate γ oscillatory activity that may be a possible avenue for cognitive potentiation in this disorder.
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Affiliation(s)
- Mera S. Barr
- Schizophrenia Program, Department of Psychiatry, Centre for Addiction and Mental Health, University of Toronto, Toronto, Ontario, Canada
| | - Faranak Farzan
- Schizophrenia Program, Department of Psychiatry, Centre for Addiction and Mental Health, University of Toronto, Toronto, Ontario, Canada
| | - Tamara Arenovich
- Biostatistical Consultant, Centre for Addiction and Mental Health, Toronto, Ontario, Canada
| | - Robert Chen
- Division of Neurology, Toronto Research Institute, University of Toronto, Toronto, Ontario, Canada
| | - Paul B. Fitzgerald
- Monash Alfred Psychiatry Research Centre, The Alfred and Monash University School of Psychology and Psychiatry, Melbourne, Victoria, Australia
| | - Zafiris J. Daskalakis
- Schizophrenia Program, Department of Psychiatry, Centre for Addiction and Mental Health, University of Toronto, Toronto, Ontario, Canada
- * E-mail:
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Goghari VM. Executive functioning-related brain abnormalities associated with the genetic liability for schizophrenia: an activation likelihood estimation meta-analysis. Psychol Med 2011; 41:1239-1252. [PMID: 20942994 DOI: 10.1017/s0033291710001972] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
BACKGROUND Relatives of schizophrenia patients demonstrate abnormalities in prefrontal cortical activation during executive processing as measured by functional neuroimaging, albeit not consistently. A meta-analysis was conducted to determine whether reliable patterns of brain hypo- and hyperactivity, especially in the middle frontal region, were present in the relatives of patients. METHOD Seventeen studies, containing 18 samples of relatives and controls, were included in this meta-analysis. Studies were included if relatives of schizophrenia patients were compared to controls, an executive processing task was used, and standard space coordinates were reported for the functional activations. Activation likelihood estimation (ALE) was implemented to find convergence across functional neuroimaging experiment coordinates. A separate analysis was conducted to assess the potential impact of a priori hypothesis testing used in region-of-interest (ROI) approaches on the meta-analysis results. RESULTS Relatives demonstrated hypo- and hyperactivity in statistically overlapping right middle frontal regions [Brodmann area (BA) 9/10]. Use of an ROI analysis that a priori focused on prefrontal regions resulted in more findings of reduced activity in the middle frontal region. CONCLUSIONS The cortical regions identified by this meta-analysis could potentially serve as intermediate biological markers in the search for candidate genes for schizophrenia. As neurocognitive deficits are related to functional impairments in patients, a better understanding of neural and genetic vulnerabilities would be beneficial in our efforts to remediate these important deficits.
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Affiliation(s)
- V M Goghari
- Department of Psychology and Psychiatry, University of Calgary, Calgary, AB, Canada.
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Waters-Metenier SL, Toulopoulou T. Qualifying brain functional MRI parameters as endophenotypes in schizophrenia. FUTURE NEUROLOGY 2010. [DOI: 10.2217/fnl.10.68] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Although the genetic contribution to schizophrenia pathogenesis has been well established, with an approximate heritability of 81%, the endeavor to elucidate the complex genetic architecture of schizophrenia has met limited success. ‘Endophenotypes’, or ‘intermediate phenotypes’, are more restricted constructs of genetic risk than the clinical manifestations hitherto employed by molecular geneticists. They are, putatively, intermediate in the pathophysiological pathway between genetic variation and clinical phenomenology and can possibly be used to assist in the elucidation of genetic diathesis for schizophrenia. In this article, we present the current evidence that supports functional MRI parameters as promising candidate endophenotypes in schizophrenia.
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Affiliation(s)
- Sheena Lindsey Waters-Metenier
- Department of Psychosis Studies, King’s College London, King’s Health Partners, Institute of Psychiatry, London SE5 8AF, UK
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Lin PI, Shuldiner AR. Rethinking the genetic basis for comorbidity of schizophrenia and type 2 diabetes. Schizophr Res 2010; 123:234-43. [PMID: 20832248 DOI: 10.1016/j.schres.2010.08.022] [Citation(s) in RCA: 88] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/23/2009] [Revised: 07/29/2010] [Accepted: 08/12/2010] [Indexed: 11/16/2022]
Abstract
The co-occurrence of schizophrenia (SCZ) and type 2 diabetes mellitus (T2D) has been well documented. This review article focuses on the hypothesis that the co-occurrence of SCZ and T2D may be, at least in part, driven by shared genetic factors. Previous genetic studies of T2D and SCZ evidence have disclosed a number of overlapped risk loci. However, the putative common genetic factors for SCZ and T2D remain inconclusive due to inconsistent findings. A systemic review of methods of identifying genetic loci contributing to the comorbidity link between SCZ and T2D is hence needed. In the current review article, we have discussed several different approaches to localizing the shared susceptibility genes for these two diseases. To begin with, one could start with probing the gene involved in both glucose and dopamine metabolisms. Additionally, hypothesis-free genome-wide association studies (GWAS) may provide more clues to the common genetic basis for these two diseases. Genetic similarities inferred from GWAS may shed some light on the genetic mechanism underlying the comorbidity link between SCZ and T2D. Meanwhile, endophenotypes (e.g., adiponectin level in T2D and working memory in SCZ) may serve as alternative phenotypes that are more directly influenced by genes than target diseases. Hence, endophenotypes of these diseases may be more tractable to identification. To summarize, novel approaches are needed to dissect the complex genetic basis of the comorbidity of SCZ and T2D.
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Affiliation(s)
- P I Lin
- Maryland Psychiatric Research Center, University of Maryland School of Medicine, Baltimore, MD, United States.
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39
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Developmental differences in sustained and transient activity underlying working memory. Brain Res 2010; 1354:140-51. [PMID: 20659432 DOI: 10.1016/j.brainres.2010.07.055] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/10/2009] [Revised: 06/04/2010] [Accepted: 07/17/2010] [Indexed: 11/24/2022]
Abstract
The amount of information one can maintain in working memory (WM) increases between childhood and adulthood (Gathercole, 1994, 1999; Klingberg, 1998; Luciana, 1998; Luciana and Nelson, 1998). In addition to cognitive changes that occur early in life, childhood and adolescence are periods marked by significant neuroanatomical changes that are thought to underlie cognitive maturation. This study used a mixed state-item design and a parametric "n-back" task to explore the relationship between WM load and neural activity changes with age. Thirty-five participants from two age groups (9 to 13 and 18 to 23years) were recruited. Our behavioral results indicated that children performed significantly worse than adults at loads of 2-back, but not 0- and 1-back. Our imaging results indicated that during performance of the 2-back task, children showed evidence for increased transient, but decreased sustained activity, in comparison to adults. These results suggest that for the 2-back condition, children had more difficulty maintaining task relevant information across trials and seemed to engage in a more reactive strategy wherein they reactivated context information on a trial-by-trial basis rather than maintaining over a delay. These results have important implications for understanding the development of specific processes within the WM system.
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40
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Emmerson LC, Ben-Zeev D, Granholm E, Tiffany M, Golshan S, Jeste DV. Prevalence and longitudinal stability of negative symptoms in healthy participants. Int J Geriatr Psychiatry 2009; 24:1438-44. [PMID: 19388007 DOI: 10.1002/gps.2284] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Abstract
OBJECTIVE Although negative symptoms are prominent in older patients with schizophrenia, it is unknown whether this pattern is prevalent in healthy participants. The objective of this study was to evaluate whether negative symptoms are present in healthy populations and to determine whether they are linked to illness-related processes or normal aging. METHODS A systemic review of 26 studies that have administered negative symptom assessments to healthy participants was conducted. In addition, 213 (age > 40 years old) healthy participants completed PANSS and SANS ratings at both baseline and 1-year follow-up. One-hundred participants also completed ratings after 3 years. RESULTS Across all reviewed studies, negative symptoms were absent in the majority of participants. Comparable results were found in the current study's large longitudinal evaluation with middle-aged to older adults. CONCLUSIONS Taken together, the data suggest that healthy volunteers do not suffer from prominent negative symptoms. This finding is consistent with the hypothesis that the greater prevalence and severity of negative symptoms in older patients is not related to normal aging but to illness-related processes.
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Pearlson GD, Calhoun VD. Convergent approaches for defining functional imaging endophenotypes in schizophrenia. Front Hum Neurosci 2009; 3:37. [PMID: 19956400 PMCID: PMC2786299 DOI: 10.3389/neuro.09.037.2009] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/08/2009] [Accepted: 10/06/2009] [Indexed: 01/24/2023] Open
Abstract
In complex genetic disorders such as schizophrenia, endophenotypes have potential utility both in identifying risk genes and in illuminating pathophysiology. This is due to their presumed status as closer in the etiopathological pathway to the causative genes than is the currently defining clinical phenomenology of the illness and thus their simpler genetic architecture than that of the full syndrome. There, many genes conferring slight individual risk are additive or epistatic (interactive) with regard to cumulative schizophrenia risk. In addition the use of endophenotypes has encouraged a conceptual shift away from the exclusive study of categorical diagnoses in manifestly ill patients, towards the study of quantitative traits in patients, unaffected relatives and healthy controls. A more recently employed strategy is thus to study unaffected first-degree relatives of schizophrenia patients, who share some of the genetic diathesis without illness-related confounds that may themselves impact fMRI task performance. Consistent with the multiple biological abnormalities associated with the disorder, many candidate endophenotypes have been advanced for schizophrenia, including measures derived from structural brain imaging, EEG, sensorimotor integration, eye movements and cognitive performance (Allen et al., 2009), but recent data derived from quantitative functional brain imaging measures present additional attractive putative endophenotypes. We will review two major, conceptually different approaches that use fMRI in this context. One, the dominant paradigm, employs defined cognitive tasks on which schizophrenia patients perform poorly as "cognitive stress tests". The second uses very simple probes or "task-free" approaches where performance in patients and controls is equal. We explore the potential advantages and disadvantages of each method, the associated data analytic approaches and recent studies exploring their interface with the genetic risk architecture of schizophrenia.
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Affiliation(s)
- Godfrey D Pearlson
- Olin Neuropsychiatry Research Center, Institute of Living Hartford, CT 06106, USA.
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Wolf RC, Vasic N, Sambataro F, Höse A, Frasch K, Schmid M, Walter H. Temporally anticorrelated brain networks during working memory performance reveal aberrant prefrontal and hippocampal connectivity in patients with schizophrenia. Prog Neuropsychopharmacol Biol Psychiatry 2009; 33:1464-73. [PMID: 19666074 DOI: 10.1016/j.pnpbp.2009.07.032] [Citation(s) in RCA: 76] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/03/2009] [Revised: 07/22/2009] [Accepted: 07/26/2009] [Indexed: 01/19/2023]
Abstract
Functional neuroimaging studies on cognitive dysfunction in schizophrenia have suggested regional brain activation changes in the dorsolateral prefrontal cortex and the medial temporal lobe. However, less is known about the functional coupling of these areas during cognitive performance. In this study, we used functional magnetic resonance imaging, a verbal working memory (WM) task and multivariate statistical techniques to investigate the functional coupling of temporally anticorrelated neural networks during cognitive processing in patients with schizophrenia (n=16) compared to healthy controls (n=16). Independent component analysis identified 18 independent components (ICs) among which two ICs were selected for further analyses. These ICs included temporally anticorrelated networks which were most highly associated with the delay period of the task in both healthy controls and patients with schizophrenia. Functional network abnormalities in patients with schizophrenia were detected within a "task-positive" lateral frontoparietal network, where increased functional connectivity was found in bilateral dorsolateral prefrontal regions. In addition, aberrant functional coupling of the hippocampal cortex in patients with schizophrenia was detected within a "task-negative" medial frontotemporal network. In patients with schizophrenia, functional connectivity indices in the left dorsolateral prefrontal cortex and the right hippocampal cortex were positively correlated with accuracy during the WM task, while the connectivity strength in the right dorsolateral prefrontal cortex was negatively correlated with measures of symptom severity. These data suggest that within two temporally anticorrelated network states, patients with schizophrenia exhibit increased and persistent dorsolateral prefrontal and hippocampal connectivity during WM performance.
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Affiliation(s)
- Robert Christian Wolf
- Department of Psychiatry and Psychotherapy III, University of Ulm, Leimgrubenweg 12-14 89075 Ulm, Germany.
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43
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MacDonald AW, Thermenos HW, Barch DM, Seidman LJ. Imaging genetic liability to schizophrenia: systematic review of FMRI studies of patients' nonpsychotic relatives. Schizophr Bull 2009; 35:1142-62. [PMID: 18556667 PMCID: PMC2762618 DOI: 10.1093/schbul/sbn053] [Citation(s) in RCA: 111] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Abstract
There is a growing literature on brain activity in the nonpsychotic first-degree relatives of patients with schizophrenia as measured using functional imaging. This systematic review examined 20 studies in 4 domains of cognition, including cognitive control (7 samples), working memory (5 samples), long-term memory (4 samples), and language (4 samples). While the literature was widely divergent, these studies did consistently find activation differences between patients' relatives and controls. The most consistent increases in activation within hemisphere were found in right ventral prefrontal cortex (PFC) and right parietal cortex. Abnormal activity, defined as significant increases or decreases in activation relative to controls irrespective of hemisphere, was found in about two-thirds of contrasts in the cerebellum, dorsal prefrontal, lateral temporal, and parietal cortices, and thalamus, with basal ganglia and ventral PFC showing abnormalities in approximately half of those contrasts. Anterior cingulate was generally spared in patients' relatives. The diversity of findings in studies of patients' relatives may derive from differences between the cognitive demands across studies. We identify avenues for building a more accurate and cumulative literature, including symmetrical inclusion criteria for relatives and controls, recording in-scanner responses, using both a priori and whole-brain tests, explicitly reporting threshold values, reporting main effects of task, reporting effect sizes, and quantifying the risk of false negatives. While functional imaging in the relatives of schizophrenia patients remains a promising methodology for understanding the impact of the unexpressed genetic liability to schizophrenia, no single region or mechanism of abnormalities has yet emerged.
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Affiliation(s)
- Angus W MacDonald
- Department of Psychology, University of Minnesota, N218 Elliott Hall, 75 East River Road, Minneapolis, MN 55455, USA.
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Karch S, Leicht G, Giegling I, Lutz J, Kunz J, Buselmeier M, Hey P, Spörl A, Jäger L, Meindl T, Pogarell O, Möller HJ, Hegerl U, Rujescu D, Mulert C. Inefficient neural activity in patients with schizophrenia and nonpsychotic relatives of schizophrenic patients: evidence from a working memory task. J Psychiatr Res 2009; 43:1185-94. [PMID: 19426993 DOI: 10.1016/j.jpsychires.2009.04.004] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/05/2008] [Revised: 03/31/2009] [Accepted: 04/14/2009] [Indexed: 01/03/2023]
Abstract
Studies of schizophrenia with functional MRI have shown hyper- and hypoactivations in various brain regions including the prefrontal cortex. Functional anomalies have also been reported in first-degree relatives of schizophrenic patients. The aim of this study was to examine working memory related brain functions in healthy subjects, schizophrenic patients and unaffected relatives and to determine the influence of psychopathology on these processes. A parametric n-back working memory task and functional MRI were used to examine 61 patients with schizophrenia, 11 nonpsychotic relatives of schizophrenic patients and a comparison group of 61 healthy subjects. The results indicated increased as well as decreased brain functions in schizophrenic patients compared to the control group depending on the task difficulty and the performance: during the attention task (0-back), which served as control condition, behavioral responses of patients and healthy subjects hardly differed but BOLD responses were considerably enhanced in schizophrenic patients. With increasing task difficulty differences between groups in BOLD responses diminished whereas behavioral deficits of patients increased. The examination of attention-independent working memory-functions (2- vs. 0-back) produced hypoactivations in patients, especially in frontal, temporal and subcortical brain regions. Furthermore, positive symptoms were associated with parietal dysfunctions. Behavioral performance and neural responses of unaffected relatives of schizophrenic patients were intermediate between schizophrenic patients and controls indicating slight brain dysfunctions. In addition, compensatory strategies were demonstrated. These findings suggest that the genetic risk for schizophrenia is accompanied by neural inefficiency which is associated with cognitive deficits, especially in difficult tasks.
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Affiliation(s)
- Susanne Karch
- Department of Psychiatry and Psychotherapy, Ludwig-Maximilians-University, Nussbaumstrasse 7, D-80336 Munich, Germany.
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Structural and functional brain correlates of subclinical psychotic symptoms in 11-13 year old schoolchildren. Neuroimage 2009; 49:1875-85. [PMID: 19770054 DOI: 10.1016/j.neuroimage.2009.09.015] [Citation(s) in RCA: 106] [Impact Index Per Article: 7.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/22/2009] [Revised: 08/07/2009] [Accepted: 09/11/2009] [Indexed: 12/17/2022] Open
Abstract
Studying children experiencing psychotic symptoms provides a unique opportunity to examine the vulnerability to psychosis within the context of development. Using neuroimaging techniques this study investigated cognitive control functions, brain volumetrics and white matter integrity in an at-risk cohort of children. Between-subjects assessment of brain function and structure among 11 school-going, non-treatment seeking children aged 11-13 who were at symptomatic risk for psychosis (AR) and 14 healthy control children aged 11-12 without subclinical psychotic symptoms (CON). MRI assessments included functional measures of response inhibition and error-related processes, whole brain voxel-based morphometry (VBM) of gray matter (GM) and diffusion tensor imaging (DTI) utilizing fractional anisotropy to probe white matter (WM) integrity. fMRI results showed reduced activity in the AR group within right frontal and bilateral temporal cortex for response inhibition and reduced activity within the anterior cingulate, insula and middle frontal gyrus for error-related processing (p<.05, corrected). VBM analysis revealed GM increases in the AR group within middle and superior temporal gyri, angular gyrus, orbitofrontal gyrus and GM decrease within the inferior temporal gyrus (p<.05, corrected). DTI analysis identified WM decreases in the AR group along the inferior fronto-occipital fasciculus, cingulum and inferior longitudinal fasciculus (p<.05, corrected). This multimodal investigation revealed aberrant prefrontal-temporal dysfunction in addition to cingulate and insular dysfunctions which provide potential early neurocognitive risk markers related to the susceptibility for developing psychosis and subsequently the neurodevelopmental trajectory leading to schizophrenia.
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Henseler I, Falkai P, Gruber O. A systematic fMRI investigation of the brain systems subserving different working memory components in schizophrenia. Eur J Neurosci 2009; 30:693-702. [PMID: 19686473 DOI: 10.1111/j.1460-9568.2009.06850.x] [Citation(s) in RCA: 51] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Abstract
Working memory impairment is one of the cardinal cognitive disturbances in schizophrenia and considerable evidence suggests that it can be traced to functional alterations in the brain. The exact allocation of specific deficits to regional specific dysfunctions, however, remains elusive. The aim of this study was to examine the functional integrity of three distinguishable brain systems underlying maintenance-related subprocesses of working memory (articulatory rehearsal, non-articulatory maintenance of phonological information, maintenance of visuospatial information) in patients with schizophrenia. Using an experimental paradigm, which had been designed to selectively activate these different brain systems, we assessed the brain activation of patients and controls with functional magnetic resonance imaging. Compared with controls, patients showed reduced activation of the fronto-opercular, intraparietal and anterior cingulate cortex during the non-articulatory maintenance of phonological information, as well as attenuated deactivation of the hippocampus. Additionally, we found prefrontal activation to depend critically on the patients' current symptom status. During visuospatial maintenance, patients showed impaired activation of the superior parietal, temporal and occipital cortex, combined with enhanced activation of the frontal eye field and the inferior parietal cortex. No abnormal activations were observed during the articulatory rehearsal task. All activation differences were independent of group differences in task performance. Our fine-grained analysis of dysfunctions in particular aspects of working memory circuitry provides evidence for a differential impairment of the brain systems supporting working memory subcomponents in schizophrenia and extends knowledge of the relationship between cognitive deficits, brain activation abnormalities and symptoms in schizophrenia.
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Affiliation(s)
- I Henseler
- Department of Psychiatry and Psychotherapy, Georg August University, Göttingen, Germany.
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Takizawa R, Tochigi M, Kawakubo Y, Marumo K, Sasaki T, Fukuda M, Kasai K. Association between catechol-O-methyltrasferase Val108/158Met genotype and prefrontal hemodynamic response in schizophrenia. PLoS One 2009; 4:e5495. [PMID: 19424500 PMCID: PMC2675059 DOI: 10.1371/journal.pone.0005495] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/03/2009] [Accepted: 04/16/2009] [Indexed: 11/19/2022] Open
Abstract
Background “Imaging genetics” studies have shown that brain function by neuroimaging is a sensitive intermediate phenotype that bridges the gap between genes and psychiatric conditions. Although the evidence of association between functional val108/158met polymorphism of the catechol-O-methyltransferase gene (COMT) and increasing risk for developing schizophrenia from genetic association studies remains to be elucidated, one of the most topical findings from imaging genetics studies is the association between COMT genotype and prefrontal function in schizophrenia. The next important step in the translational approach is to establish a useful neuroimaging tool in clinical settings that is sensitive to COMT variation, so that the clinician could use the index to predict clinical response such as improvement in cognitive dysfunction by medication. Here, we investigated spatiotemporal characteristics of the association between prefrontal hemodynamic activation and the COMT genotype using a noninvasive neuroimaging technique, near-infrared spectroscopy (NIRS). Methodology/Principal Findings Study participants included 45 patients with schizophrenia and 60 healthy controls matched for age and gender. Signals that are assumed to reflect regional cerebral blood volume were monitored over prefrontal regions from 52-channel NIRS and compared between two COMT genotype subgroups (Met carriers and Val/Val individuals) matched for age, gender, premorbid IQ, and task performance. The [oxy-Hb] increase in the Met carriers during the verbal fluency task was significantly greater than that in the Val/Val individuals in the frontopolar prefrontal cortex of patients with schizophrenia, although neither medication nor clinical symptoms differed significantly between the two subgroups. These differences were not found to be significant in healthy controls. Conclusions/Significance These data suggest that the prefrontal NIRS signals can noninvasively detect the impact of COMT variation in patients with schizophrenia. NIRS may be a promising candidate translational approach in psychiatric neuroimaging.
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Affiliation(s)
- Ryu Takizawa
- Department of Neuropsychiatry, Graduate School of Medicine, The University of Tokyo, Tokyo, Japan.
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Takizawa R, Hashimoto K, Tochigi M, Kawakubo Y, Marumo K, Sasaki T, Fukuda M, Kasai K. Association between sigma-1 receptor gene polymorphism and prefrontal hemodynamic response induced by cognitive activation in schizophrenia. Prog Neuropsychopharmacol Biol Psychiatry 2009; 33:491-8. [PMID: 19439245 DOI: 10.1016/j.pnpbp.2009.01.014] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/06/2008] [Revised: 01/22/2009] [Accepted: 01/27/2009] [Indexed: 12/01/2022]
Abstract
The molecular biological role of the sigma-1 receptor (Sig-1R) has attracted much attention. Evidence suggests that the Sig-1R engaged in modulating NMDA and dopamine receptors is involved in the pathophysiology of schizophrenia and the mechanism of psychotropic drug efficacy. However, whether the Sig-1R genotype affects brain function in schizophrenia in vivo remains unknown. We investigated the association between Sig-1R functional polymorphism (Gln2Pro) and brain function in schizophrenia. The subjects were 40 patients with schizophrenia and 60 healthy controls, all right-handed, who gave written informed consent to participate. Signals, detected from prefrontal regions by 52-channel near-infrared spectroscopy (NIRS) during cognitive activation, were compared between two Sig1-R genotype subgroups (Gln/Gln individuals and Pro carriers) matched for age, gender, premorbid IQ and task performance. The prefrontal hemodynamic response of healthy controls during the verbal fluency task was higher than that of patients with schizophrenia. For the patients with schizophrenia, even after controlling the effect of medication, the [oxy-Hb] increase in the prefrontal cortex of the Gln/Gln genotype group was significantly greater than that of the Pro carriers (false discovery rate corrected p<0.05). Clinical symptoms were not significantly different between the two Sig-1R genotype subgroups. These differences were not significant in the healthy controls. This is the first functional imaging genetics study that implicated the association between Sig-1R genotype and prefrontal cortical function in schizophrenia in vivo. Our findings also suggest that the prefrontal hemodynamic response assessed by noninvasive and less demanding NIRS is a useful intermediate phenotype for translational research in schizophrenia.
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Affiliation(s)
- Ryu Takizawa
- Department of Neuropsychiatry, Graduate School of Medicine, The University of Tokyo, Japan.
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Liu J, Pearlson G, Windemuth A, Ruano G, Perrone-Bizzozero NI, Calhoun V. Combining fMRI and SNP data to investigate connections between brain function and genetics using parallel ICA. Hum Brain Mapp 2009; 30:241-55. [PMID: 18072279 DOI: 10.1002/hbm.20508] [Citation(s) in RCA: 169] [Impact Index Per Article: 11.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023] Open
Abstract
There is current interest in understanding genetic influences on both healthy and disordered brain function. We assessed brain function with functional magnetic resonance imaging (fMRI) data collected during an auditory oddball task--detecting an infrequent sound within a series of frequent sounds. Then, task-related imaging findings were utilized as potential intermediate phenotypes (endophenotypes) to investigate genomic factors derived from a single nucleotide polymorphism (SNP) array. Our target is the linkage of these genomic factors to normal/abnormal brain functionality. We explored parallel independent component analysis (paraICA) as a new method for analyzing multimodal data. The method was aimed to identify simultaneously independent components of each modality and the relationships between them. When 43 healthy controls and 20 schizophrenia patients, all Caucasian, were studied, we found a correlation of 0.38 between one fMRI component and one SNP component. This fMRI component consisted mainly of parietal lobe activations. The relevant SNP component was contributed to significantly by 10 SNPs located in genes, including those coding for the nicotinic alpha-7 cholinergic receptor, aromatic amino acid decarboxylase, disrupted in schizophrenia 1, among others. Both fMRI and SNP components showed significant differences in loading parameters between the schizophrenia and control groups (P = 0.0006 for the fMRI component; P = 0.001 for the SNP component). In summary, we constructed a framework to identify interactions between brain functional and genetic information; our findings provide a proof-of-concept that genomic SNP factors can be investigated by using endophenotypic imaging findings in a multivariate format.
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Affiliation(s)
- Jingyu Liu
- The Mind Research Network, Albuquerque, New Mexico, USA.
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Barch DM, Berman MG, Engle R, Jones JH, Jonides J, Macdonald A, Nee DE, Redick TS, Sponheim SR. CNTRICS final task selection: working memory. Schizophr Bull 2009; 35:136-52. [PMID: 18990711 PMCID: PMC2643954 DOI: 10.1093/schbul/sbn153] [Citation(s) in RCA: 81] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
The third meeting of the Cognitive Neuroscience Treatment Research to Improve Cognition in Schizophrenia (CNTRICS) was focused on selecting promising measures for each of the cognitive constructs selected in the first CNTRICS meeting. In the domain of working memory, the 2 constructs of interest were goal maintenance and interference control. CNTRICS received 3 task nominations for each of these constructs, and the breakout group for working memory evaluated the degree to which each of these tasks met prespecified criteria. For goal maintenance, the breakout group for working memory recommended the AX-Continuous Performance Task/Dot Pattern Expectancy task for translation for use in clinical trial contexts in schizophrenia research. For interference control, the breakout group recommended the recent probes and operation/symmetry span tasks for translation for use in clinical trials. This article describes the ways in which each of these tasks met the criteria used by the breakout group to recommend tasks for further development.
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Affiliation(s)
- Deanna M Barch
- Department of Psychology, Washington University, St Louis, MO 63130, USA.
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