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Francisco AA, Foxe JJ, Molholm S. Event-related potential (ERP) markers of 22q11.2 deletion syndrome and associated psychosis. J Neurodev Disord 2023; 15:19. [PMID: 37328766 PMCID: PMC10273715 DOI: 10.1186/s11689-023-09487-9] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/08/2022] [Accepted: 06/07/2023] [Indexed: 06/18/2023] Open
Abstract
22q11.2 deletion syndrome (22q11.2DS) is a multisystemic disorder characterized by a wide range of clinical features, ranging from life-threatening to less severe conditions. One-third of individuals with the deletion live with mild to moderate intellectual disability; approximately 60% meet criteria for at least one psychiatric condition.22q11.2DS has become an important model for several medical, developmental, and psychiatric disorders. We have been particularly interested in understanding the risk for psychosis in this population: Approximately 30% of the individuals with the deletion go on to develop schizophrenia. The characterization of cognitive and neural differences between those individuals who develop schizophrenia and those who do not, despite being at genetic risk, holds important promise in what pertains to the clarification of paths to disease and to the development of tools for early identification and intervention.Here, we review our previous event-related potential (ERP) findings as potential markers for 22q11.2DS and the associated risk for psychosis, while discussing others' work. We focus on auditory processing (auditory-evoked potentials, auditory adaptation, and auditory sensory memory), visual processing (visual-evoked potentials and visual adaptation), and inhibition and error monitoring.The findings discussed suggest basic mechanistic and disease process effects on neural processing in 22q11.2DS that are present in both early sensory and later cognitive processing, with possible implications for phenotype. In early sensory processes, both during auditory and visual processing, two mechanisms that impact neural responses in opposite ways seem to coexist-one related to the deletion, which increases brain responses; another linked to psychosis, decreasing neural activity. Later, higher-order cognitive processes may be equally relevant as markers for psychosis. More specifically, we argue that components related to error monitoring may hold particular promise in the study of risk for schizophrenia in the general population.
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Affiliation(s)
- Ana A Francisco
- Department of Pediatrics, The Cognitive Neurophysiology Laboratory, Albert Einstein College of Medicine, Bronx, NY, USA.
| | - John J Foxe
- Department of Pediatrics, The Cognitive Neurophysiology Laboratory, Albert Einstein College of Medicine, Bronx, NY, USA
- Department of Neuroscience, Rose F. Kennedy Center, Albert Einstein College of Medicine, Bronx, NY, USA
- Department of Neuroscience, The Frederick J. and Marion A, Schindler Cognitive Neurophysiology Laboratory, The Ernest J. Del Monde Institute for Neuroscience, University of Rochester, School of Medicine and Dentistry, Rochester, NY, USA
| | - Sophie Molholm
- Department of Pediatrics, The Cognitive Neurophysiology Laboratory, Albert Einstein College of Medicine, Bronx, NY, USA.
- Department of Neuroscience, Rose F. Kennedy Center, Albert Einstein College of Medicine, Bronx, NY, USA.
- Department of Neuroscience, The Frederick J. and Marion A, Schindler Cognitive Neurophysiology Laboratory, The Ernest J. Del Monde Institute for Neuroscience, University of Rochester, School of Medicine and Dentistry, Rochester, NY, USA.
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Devrim-Üçok M, Keskin-Ergen HY, Üçok A. Visual P3 abnormalities in patients with first-episode schizophrenia, unaffected siblings of schizophrenia patients and individuals at ultra-high risk for psychosis. Prog Neuropsychopharmacol Biol Psychiatry 2023; 122:110678. [PMID: 36427549 DOI: 10.1016/j.pnpbp.2022.110678] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/14/2022] [Revised: 11/11/2022] [Accepted: 11/12/2022] [Indexed: 11/24/2022]
Abstract
Cued version of the continuous performance test (AX-CPT) assesses sustained attention, working memory and cognitive control processes, which have been reported as impaired in schizophrenia. This study investigated visual P3 event-related potential elicited during cued CPT in patients with schizophrenia and in individuals who were at clinical or genetic high risk for psychosis to determine whether any abnormality may provide a marker of vulnerability for psychosis. Visual P3 elicited during cued CPT have not been reported in individuals at high risk for psychosis. Visual Go and NoGo P3 potentials were assessed in 34 antipsychotic-naive patients with first-episode schizophrenia (FES), 25 clinically unaffected siblings of these patients (familial high-risk for psychosis, FHR), 49 antipsychotic-naive individuals at ultra-high risk for psychosis (UHR) and 37 healthy control (HC) participants. FES patients had overall smaller P3 amplitudes than all other groups. P3 amplitude of the UHR participants was in-between the HC participants and FES patients. The anteroposterior P3 topography differed between the groups, with FES patients and FHR participants showing a more frontally distributed P3 compared with the HC participants. These findings suggest that the reduction in visual P3 amplitude may provide a vulnerability marker for psychosis in individuals who are at clinical high risk for psychosis and that a more frontally distributed visual P3 may be a marker of genetic liability for psychosis.
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Affiliation(s)
- Müge Devrim-Üçok
- Department of Physiology, Istanbul Faculty of Medicine, Istanbul University, Istanbul, Turkey.
| | - H Yasemin Keskin-Ergen
- Department of Physiology, Istanbul Faculty of Medicine, Istanbul University, Istanbul, Turkey
| | - Alp Üçok
- Department of Psychiatry, Istanbul Faculty of Medicine, Istanbul University, Istanbul, Turkey
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3
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Francisco AA, Foxe JJ, Horsthuis DJ, Molholm S. Early visual processing and adaptation as markers of disease, not vulnerability: EEG evidence from 22q11.2 deletion syndrome, a population at high risk for schizophrenia. SCHIZOPHRENIA (HEIDELBERG, GERMANY) 2022; 8:28. [PMID: 35314711 PMCID: PMC8938446 DOI: 10.1038/s41537-022-00240-0] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/26/2021] [Accepted: 02/21/2022] [Indexed: 01/17/2023]
Abstract
We investigated visual processing and adaptation in 22q11.2 deletion syndrome (22q11.2DS), a condition characterized by an increased risk for schizophrenia. Visual processing differences have been described in schizophrenia but remain understudied early in the disease course. Electrophysiology was recorded during a visual adaptation task with different interstimulus intervals to investigate visual processing and adaptation in 22q11.2DS (with (22q+) and without (22q−) psychotic symptoms), compared to control and idiopathic schizophrenia groups. Analyses focused on early windows of visual processing. While increased amplitudes were observed in 22q11.2DS in an earlier time window (90–140 ms), decreased responses were seen later (165–205 ms) in schizophrenia and 22q+. 22q11.2DS, and particularly 22q−, presented increased adaptation effects. We argue that while amplitude and adaptation in the earlier time window may reflect specific neurogenetic aspects associated with a deletion in chromosome 22, amplitude in the later window may be a marker of the presence of psychosis and/or of its chronicity/severity.
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Affiliation(s)
- Ana A Francisco
- The Cognitive Neurophysiology Laboratory, Department of Pediatrics, Albert Einstein College of Medicine, Bronx, NY, USA.
| | - John J Foxe
- The Cognitive Neurophysiology Laboratory, Department of Pediatrics, Albert Einstein College of Medicine, Bronx, NY, USA.,Department of Neuroscience, Rose F. Kennedy Center, Albert Einstein College of Medicine, Bronx, NY, USA.,The Cognitive Neurophysiology Laboratory, Department of Neuroscience, The Ernest J. Del Monde Institute for Neuroscience, School of Medicine and Dentistry, University of Rochester, Rochester, NY, USA
| | - Douwe J Horsthuis
- The Cognitive Neurophysiology Laboratory, Department of Pediatrics, Albert Einstein College of Medicine, Bronx, NY, USA
| | - Sophie Molholm
- The Cognitive Neurophysiology Laboratory, Department of Pediatrics, Albert Einstein College of Medicine, Bronx, NY, USA. .,Department of Neuroscience, Rose F. Kennedy Center, Albert Einstein College of Medicine, Bronx, NY, USA. .,The Cognitive Neurophysiology Laboratory, Department of Neuroscience, The Ernest J. Del Monde Institute for Neuroscience, School of Medicine and Dentistry, University of Rochester, Rochester, NY, USA.
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4
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Canu D, Ioannou C, Müller K, Martin B, Fleischhaker C, Biscaldi M, Beauducel A, Smyrnis N, van Elst LT, Klein C. Visual search in neurodevelopmental disorders: evidence towards a continuum of impairment. Eur Child Adolesc Psychiatry 2022; 31:1-18. [PMID: 33751240 PMCID: PMC9343296 DOI: 10.1007/s00787-021-01756-z] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/02/2020] [Accepted: 03/08/2021] [Indexed: 02/07/2023]
Abstract
Disorders with neurodevelopmental aetiology such as Attention-Deficit/Hyperactivity Disorder (ADHD), Autism Spectrum Disorder (ASD) and Schizophrenia share commonalities at many levels of investigation despite phenotypic differences. Evidence of genetic overlap has led to the concept of a continuum of neurodevelopmental impairment along which these disorders can be positioned in aetiological, pathophysiological and developmental features. This concept requires their simultaneous comparison at different levels, which has not been accomplished so far. Given that cognitive impairments are core to the pathophysiology of these disorders, we provide for the first time differentiated head-to-head comparisons in a complex cognitive function, visual search, decomposing the task with eye movement-based process analyses. N = 103 late-adolescents with schizophrenia, ADHD, ASD and healthy controls took a serial visual search task, while their eye movements were recorded. Patients with schizophrenia presented the greatest level of impairment across different phases of search, followed by patients with ADHD, who shared with patients with schizophrenia elevated intra-subject variability in the pre-search stage. ASD was the least impaired group, but similar to schizophrenia in post-search processes and to schizophrenia and ADHD in pre-search processes and fixation duration while scanning the items. Importantly, the profiles of deviancy from controls were highly correlated between all three clinical groups, in line with the continuum idea. Findings suggest the existence of one common neurodevelopmental continuum of performance for the three disorders, while quantitative differences appear in the level of impairment. Given the relevance of cognitive impairments in these three disorders, we argue in favour of overlapping pathophysiological mechanisms.
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Affiliation(s)
- Daniela Canu
- Department of Child and Adolescent Psychiatry, Psychotherapy, and Psychosomatics, Medical Center - University of Freiburg, Faculty of Medicine, University of Freiburg, Freiburg, Germany.
| | - Chara Ioannou
- Department of Child and Adolescent Psychiatry, Psychotherapy, and Psychosomatics, Medical Center - University of Freiburg, Faculty of Medicine, University of Freiburg, Freiburg, Germany
| | - Katarina Müller
- Psychotherapeutisches Wohnheim für junge Menschen Leppermühle, Buseck, Germany
| | - Berthold Martin
- Psychotherapeutisches Wohnheim für junge Menschen Leppermühle, Buseck, Germany
| | - Christian Fleischhaker
- Department of Child and Adolescent Psychiatry, Psychotherapy, and Psychosomatics, Medical Center - University of Freiburg, Faculty of Medicine, University of Freiburg, Freiburg, Germany
| | - Monica Biscaldi
- Department of Child and Adolescent Psychiatry, Psychotherapy, and Psychosomatics, Medical Center - University of Freiburg, Faculty of Medicine, University of Freiburg, Freiburg, Germany
| | | | - Nikolaos Smyrnis
- 2nd Psychiatry Department, National and Kapodistrian University of Athens, Medical School, University General Hospital "ATTIKON", Athens, Greece
| | - Ludger Tebartz van Elst
- Department of Psychiatry and Psychotherapy, Medical Center - University of Freiburg, Faculty of Medicine, University of Freiburg, Freiburg, Germany
| | - Christoph Klein
- Department of Child and Adolescent Psychiatry, Psychotherapy, and Psychosomatics, Medical Center - University of Freiburg, Faculty of Medicine, University of Freiburg, Freiburg, Germany.
- 2nd Psychiatry Department, National and Kapodistrian University of Athens, Medical School, University General Hospital "ATTIKON", Athens, Greece.
- Department of Child and Adolescent Psychiatry, Medical Faculty, University of Cologne, Cologne, Germany.
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Dias EC, Van Voorhis AC, Braga F, Todd J, Lopez-Calderon J, Martinez A, Javitt DC. Impaired Fixation-Related Theta Modulation Predicts Reduced Visual Span and Guided Search Deficits in Schizophrenia. Cereb Cortex 2021; 30:2823-2833. [PMID: 32030407 DOI: 10.1093/cercor/bhz277] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
During normal visual behavior, individuals scan the environment through a series of saccades and fixations. At each fixation, the phase of ongoing rhythmic neural oscillations is reset, thereby increasing efficiency of subsequent visual processing. This phase-reset is reflected in the generation of a fixation-related potential (FRP). Here, we evaluate the integrity of theta phase-reset/FRP generation and Guided Visual Search task in schizophrenia. Subjects performed serial and parallel versions of the task. An initial study (15 healthy controls (HC)/15 schizophrenia patients (SCZ)) investigated behavioral performance parametrically across stimulus features and set-sizes. A subsequent study (25-HC/25-SCZ) evaluated integrity of search-related FRP generation relative to search performance and evaluated visual span size as an index of parafoveal processing. Search times were significantly increased for patients versus controls across all conditions. Furthermore, significantly, deficits were observed for fixation-related theta phase-reset across conditions, that fully predicted impaired reduced visual span and search performance and correlated with impaired visual components of neurocognitive processing. By contrast, overall search strategy was similar between groups. Deficits in theta phase-reset mechanisms are increasingly documented across sensory modalities in schizophrenia. Here, we demonstrate that deficits in fixation-related theta phase-reset during naturalistic visual processing underlie impaired efficiency of early visual function in schizophrenia.
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Affiliation(s)
- Elisa C Dias
- Schizophrenia Research Division, Nathan Kline Institute for Psychiatric Research, Orangeburg, NY 10920 USA.,Department of Psychiatry, New York University School of Medicine, New York, NY 10016 USA
| | - Abraham C Van Voorhis
- Schizophrenia Research Division, Nathan Kline Institute for Psychiatric Research, Orangeburg, NY 10920 USA
| | - Filipe Braga
- Schizophrenia Research Division, Nathan Kline Institute for Psychiatric Research, Orangeburg, NY 10920 USA
| | - Julianne Todd
- Schizophrenia Research Division, Nathan Kline Institute for Psychiatric Research, Orangeburg, NY 10920 USA
| | - Javier Lopez-Calderon
- Schizophrenia Research Division, Nathan Kline Institute for Psychiatric Research, Orangeburg, NY 10920 USA
| | - Antigona Martinez
- Schizophrenia Research Division, Nathan Kline Institute for Psychiatric Research, Orangeburg, NY 10920 USA.,Department of Experimental Therapeutics, College of Physicians and Surgeons, Columbia University, New York, NY, 10032 USA
| | - Daniel C Javitt
- Schizophrenia Research Division, Nathan Kline Institute for Psychiatric Research, Orangeburg, NY 10920 USA.,Department of Experimental Therapeutics, College of Physicians and Surgeons, Columbia University, New York, NY, 10032 USA
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Klein SD, Olman CA, Sponheim SR. Perceptual Mechanisms of Visual Hallucinations and Illusions in Psychosis. JOURNAL OF PSYCHIATRY AND BRAIN SCIENCE 2020; 5:e200020. [PMID: 32944656 PMCID: PMC7494209 DOI: 10.20900/jpbs.20200020] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
Psychosis has been associated with neural anomalies across a number of brain regions and cortical networks. Nevertheless, the exact pathophysiology of the disorder remains unclear. Aberrant visual perceptions such as hallucinations are evident in psychosis, while the occurrence of visual distortions is elevated in individuals with genetic liability for psychosis. The overall goals of this project are to: (1) use psychophysical tasks and neuroimaging to characterize deficits in visual perception; (2) acquire a mechanistic understanding of these deficits through development and validation of a computational model; and (3) determine if said mechanisms mark genetic liability for psychosis. Visual tasks tapping both low- and high-level visual processing are being completed as individuals with psychotic disorders (IPD), first-degree biological siblings of IPDs (SibIPDs) and healthy controls (HCs) undergo 248-channel magneto-encephalography (MEG) recordings followed by 7 Tesla functional magnetic resonance imaging (MRI). By deriving cortical source signals from MEG and MRI data, we will characterize the timing, location and coordination of neural processes. We hypothesize that IPDs prone to visual hallucinations will exhibit deviant functions within early visual cortex, and that aberrant contextual influences on visual perception will involve higher-level visual cortical regions and be associated with visual hallucinations. SibIPDs who experience visual distortions-but not hallucinations-are hypothesized to exhibit deficits in higher-order visual processing reflected in abnormal inter-regional neural synchronization. We hope the results lead to the development of targeted interventions for psychotic disorders, as well as identify useful biomarkers for aberrant neural functions that give rise to psychosis.
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Affiliation(s)
- Samuel D. Klein
- Clinical Science and Psychopathology Research Program, University of Minnesota-Twin Cities, 75 East River Road, Minneapolis, MN 55455, USA
| | - Cheryl A. Olman
- Department of Psychology, University of Minnesota-Twin Cities, 75 East River Road, Minneapolis, MN 55455, USA
- Center for Magnetic Resonance Research, University of Minnesota-Twin Cities, 2021 6th St SE, Minneapolis, MN 55455, USA
| | - Scott R. Sponheim
- Minneapolis Veterans Affairs Health Care System, 1 Veterans Dr, Minneapolis, MN 55417, USA
- Department of Psychiatry and Behavioral Science, University of Minnesota, 606 24th Ave S, Minneapolis, MN 55454, USA
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7
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Jimenez AM, Lee J, Green MF, Wynn JK. Functional connectivity when detecting rare visual targets in schizophrenia. Psychiatry Res 2017; 261:35-43. [PMID: 28126618 PMCID: PMC5333783 DOI: 10.1016/j.pscychresns.2017.01.007] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/20/2016] [Revised: 01/05/2017] [Accepted: 01/12/2017] [Indexed: 02/01/2023]
Abstract
Individuals with schizophrenia demonstrate difficulties in attending to important stimuli (e.g., targets) and ignoring distractors (e.g., non-targets). We used a visual oddball task during fMRI to examine functional connectivity within and between the ventral and dorsal attention networks to determine the relative contribution of each network to detection of rare visual targets in schizophrenia. The sample comprised 25 schizophrenia patients and 27 healthy controls. Psychophysiological interaction analysis was used to examine whole-brain functional connectivity in response to targets. We used the right temporo parietal junction (TPJ) as the seed region for the ventral network and the right medial intraparietal sulcus (IPS) as the seed region for the dorsal network. We found that connectivity between right IPS and right anterior insula (AI; a component of the ventral network) was significantly greater in controls than patients. Expected patterns of within- and between-network connectivity for right TPJ were observed in controls, and not significantly different in patients. These findings indicate functional connectivity deficits between the dorsal and ventral attention networks in schizophrenia that may create problems in processing relevant versus irrelevant stimuli. Understanding the nature of network disruptions underlying cognitive deficits of schizophrenia may help shed light on the pathophysiology of this disorder.
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Affiliation(s)
- Amy M Jimenez
- Desert Pacific MIRECC, VA Greater Los Angeles Healthcare System, Los Angeles, CA, USA; Department of Psychiatry and Biobehavioral Sciences, University of California, Los Angeles, CA, USA.
| | - Junghee Lee
- Desert Pacific MIRECC, VA Greater Los Angeles Healthcare System, Los Angeles, CA, USA; Department of Psychiatry and Biobehavioral Sciences, University of California, Los Angeles, CA, USA
| | - Michael F Green
- Desert Pacific MIRECC, VA Greater Los Angeles Healthcare System, Los Angeles, CA, USA; Department of Psychiatry and Biobehavioral Sciences, University of California, Los Angeles, CA, USA
| | - Jonathan K Wynn
- Desert Pacific MIRECC, VA Greater Los Angeles Healthcare System, Los Angeles, CA, USA; Department of Psychiatry and Biobehavioral Sciences, University of California, Los Angeles, CA, USA
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Abnormal early brain responses during visual search are evident in schizophrenia but not bipolar affective disorder. Schizophr Res 2016; 170:102-8. [PMID: 26603466 DOI: 10.1016/j.schres.2015.11.007] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/25/2015] [Revised: 11/05/2015] [Accepted: 11/09/2015] [Indexed: 11/21/2022]
Abstract
People with schizophrenia show deficits in processing visual stimuli but neural abnormalities underlying the deficits are unclear and it is unknown whether such functional brain abnormalities are present in other severe mental disorders or in individuals who carry genetic liability for schizophrenia. To better characterize brain responses underlying visual search deficits and test their specificity to schizophrenia we gathered behavioral and electrophysiological responses during visual search (i.e., Span of Apprehension [SOA] task) from 38 people with schizophrenia, 31 people with bipolar disorder, 58 biological relatives of people with schizophrenia, 37 biological relatives of people with bipolar disorder, and 65 non-psychiatric control participants. Through subtracting neural responses associated with purely sensory aspects of the stimuli we found that people with schizophrenia exhibited reduced early posterior task-related neural responses (i.e., Span Endogenous Negativity [SEN]) while other groups showed normative responses. People with schizophrenia exhibited longer reaction times than controls during visual search but nearly identical accuracy. Those individuals with schizophrenia who had larger SENs performed more efficiently (i.e., shorter reaction times) on the SOA task suggesting that modulation of early visual cortical responses facilitated their visual search. People with schizophrenia also exhibited a diminished P300 response compared to other groups. Unaffected first-degree relatives of people with bipolar disorder and schizophrenia showed an amplified N1 response over posterior brain regions in comparison to other groups. Diminished early posterior brain responses are associated with impaired visual search in schizophrenia and appear to be specifically associated with the neuropathology of schizophrenia.
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9
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Oribe N, Hirano Y, Kanba S, del Re EC, Seidman LJ, Mesholam-Gately R, Spencer KM, McCarley RW, Niznikiewicz MA. Early and late stages of visual processing in individuals in prodromal state and first episode schizophrenia: an ERP study. Schizophr Res 2013; 146:95-102. [PMID: 23433503 DOI: 10.1016/j.schres.2013.01.015] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/06/2012] [Revised: 01/07/2013] [Accepted: 01/09/2013] [Indexed: 11/24/2022]
Abstract
BACKGROUND P300 deficits in schizophrenia patients are well established, especially in the auditory modality. Several studies have also reported P300 abnormalities in schizophrenia in visual tasks, but these findings are inconsistent. Furthermore, reports on P300 in visual modality in prodromal subjects are very limited. While P300 indexes relatively late and complex cognitive functions such as context updating in working memory, sensory-evoked components such as the P1/N1 primarily index early stages of perceptual processing. Several previous studies suggest that P300 reduction in schizophrenia patients may be dissociable from these earlier components. Therefore, in this study, we measured the P300 component as well as the P1/N1 in a visual oddball paradigm in prodromal subjects and first episode schizophrenia patients, and compared them with those of healthy controls. METHOD Visual P300 and P1/N1 were obtained from prodromal (PRO, n = 23), first episode schizophrenia patients (SZ, n = 17), and healthy control subjects (HC, n = 31), who silently counted infrequent target stimuli ("X") amid standard stimuli ("Y") presented on the screen while 64-channel EEG was recorded. RESULTS Both PRO and SZ subjects showed reduced P300 amplitudes and delayed P300 peak latencies in comparison to control subjects. On the other hand, N1 amplitude was significantly reduced only in SZ but not in PRO. Increased severity of positive symptoms was significantly associated with smaller P300 amplitude in PRO. CONCLUSIONS These results suggest that visual P300 is affected already at the prodromal stage and could be a marker of the prodromal phase of schizophrenia.
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Affiliation(s)
- Naoya Oribe
- Clinical Neuroscience Division, Laboratory of Neuroscience, VA Boston Healthcare System-Brockton Division, Department of Psychiatry, Harvard Medical School, Brockton, MA, United States
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10
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Finke M, Barceló F, Garolera M, Cortiñas M, Garrido G, Pajares M, Escera C. Impaired preparatory re-mapping of stimulus–response associations and rule-implementation in schizophrenic patients—The role for differences in early processing. Biol Psychol 2011; 87:358-65. [DOI: 10.1016/j.biopsycho.2011.04.006] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/13/2010] [Revised: 03/03/2011] [Accepted: 04/19/2011] [Indexed: 11/16/2022]
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11
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Neuhaus AH, Karl C, Hahn E, Trempler NR, Opgen-Rhein C, Urbanek C, Hahn C, Ta TMT, Dettling M. Dissection of early bottom-up and top-down deficits during visual attention in schizophrenia. Clin Neurophysiol 2011; 122:90-8. [DOI: 10.1016/j.clinph.2010.06.011] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2010] [Revised: 04/19/2010] [Accepted: 06/13/2010] [Indexed: 11/29/2022]
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12
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Lee SY, Namkoong K, Cho HH, Song DH, An SK. Reduced visual P300 amplitudes in individuals at ultra-high risk for psychosis and first-episode schizophrenia. Neurosci Lett 2010; 486:156-60. [DOI: 10.1016/j.neulet.2010.09.035] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/08/2010] [Revised: 08/31/2010] [Accepted: 09/14/2010] [Indexed: 11/30/2022]
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13
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Müller-Plath G, Ott DVM, Pollmann S. Deficits in subprocesses of visual feature search after frontal, parietal, and temporal brain lesions--a modeling approach. J Cogn Neurosci 2010; 22:1399-424. [PMID: 19445605 DOI: 10.1162/jocn.2009.21275] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
Abstract
Deficits in visuospatial attention are commonly observed after different kinds of brain lesions. However, the structure-function relationships are not well understood. We investigated whether our response time (RT) model, strategies of visual search (STRAVIS), combined with a linear model of brain lesions, enables us to relate specific impairments in cognitive processes to specific sites of focal brain lesions. In STRAVIS, RTs in overt visual feature search with graded target-distractor similarity are decomposed into the durations of successive search steps. Fitting the model to an observer's RTs yields individual estimates of the parameters "attentional focus size," "attentional dwell time," and "movement time of attention or the eyes." In 28 patients with various focal lesions to the frontal, parietal, and/or temporal cortex and 28 matched controls, we determined with the help of linear models which lesions were most predictive for each parameter. Predictions were validated with a second sample of 12 patients and 12 controls. Critical lesion areas for the STRAVIS focus size were the dorsolateral prefrontal cortex and the temporal lobe, with dorsolateral prefrontal cortex lesions reducing the focus and temporal lesions enlarging it. The STRAVIS dwell time was reduced in patients with lesions to the anterior insula and the superior parietal lobe. Lesions to the frontal eye fields, the superior parietal lobe, and the parieto-occipital cortex were most detrimental to the STRAVIS movement time. Applying linear models to a patient sample with heterogeneous lesions may be a promising new method for investigating how different brain areas interplay in a complex task.
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14
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Bachman P, Kim J, Yee CM, Therman S, Manninen M, Lönnqvist J, Kaprio J, Huttunen MO, Näätänen R, Cannon TD. Efficiency of working memory encoding in twins discordant for schizophrenia. Psychiatry Res 2009; 174:97-104. [PMID: 19853415 PMCID: PMC2792637 DOI: 10.1016/j.pscychresns.2009.04.010] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/27/2008] [Revised: 04/24/2009] [Accepted: 04/24/2009] [Indexed: 10/20/2022]
Abstract
It has been proposed that patients with schizophrenia and some of their relatives suffer from reduced neurocognitive efficiency, increasing their sensitivity to experimental task demands. The present study evaluated such a possibility during performance of a working memory task by schizophrenia patients and their co-twins along with a healthy control sample. Electrophysiological data were obtained from sets of nine twin pairs (monozygotic and dizygotic pairs collapsed) discordant for a diagnosis of schizophrenia and from nine matched healthy control twin pairs, during administration of a variable-load spatial working memory task. Event-related potentials (ERPs) were measured immediately after memory set onset and during a delay period. For correctly performed trials, slow-wave ERP activity measured during the late stimulus encoding and delay periods exhibited a significant Diagnostic Group-by-Memory Load interaction, with schizophrenia patients showing a differentially strong load effect. Patients' co-twins displayed an intermediate level of load sensitivity while healthy controls showed no significant load effect. These results support an inefficiency model of neurocognitive dysfunction in schizophrenia, a pattern that appears to be related to the pathogenesis and inheritance of the disorder. Furthermore, this inefficiency appeared during the late stimulus encoding stage of working memory functioning, possibly reflecting disruptions in stimulus representation consolidation.
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Affiliation(s)
- Peter Bachman
- Department of Psychology, University of California, Los Angeles, Los Angeles, CA 90095-1563, United States.
| | - Junghoon Kim
- Moss Rehabilitation Research Institute, Philadelphia, Pennsylvania, Korman Suite 218, 1200 W. Tabor Rd., Philadelphia, PA 19141,
| | - Cindy M. Yee
- Department of Psychology, and Department of Psychiatry & Biobehavioral Sciences, UCLA, 1285 Franz Hall, Box 951563, Los Angeles, CA 90095-1563, ,
| | - Sebastian Therman
- Department of Mental Health & Alcohol Research, National Public Health Institute, Mannerheimintie 166, FIN-00300 Helsinki, Finland, , , ,
| | - Marko Manninen
- Department of Mental Health & Alcohol Research, National Public Health Institute, Mannerheimintie 166, FIN-00300 Helsinki, Finland, , , ,
| | - Jouko Lönnqvist
- Department of Mental Health & Alcohol Research, National Public Health Institute, Mannerheimintie 166, FIN-00300 Helsinki, Finland, , , ,
| | - Jaakko Kaprio
- Department of Mental Health & Alcohol Research, National Public Health Institute, Mannerheimintie 166, FIN-00300 Helsinki, Finland, , , , ,Department of Public Health, University of Helsinki, Finland, Faculty of Medicine, P.O. Box 41 (Mannerheimintie 172), FIN-00014 University of Helsinki,
| | - Matti O. Huttunen
- Department of Mental Health & Alcohol Research, National Public Health Institute, Mannerheimintie 166, FIN-00300 Helsinki, Finland, , , ,
| | - Risto Näätänen
- Cognitive Brain Research Unit, Department of Psychology, University of Helsinki, Finland, P.O. Box 9 (Siltavuorenpenger 20 C), FIN-00014 University of Helsinki, ,Helsinki Brain Research Centre, Helsinki, Finland, P.O. Box 9 (Siltavuorenpenger 20 C), FIN-00014 University of Helsinki
| | - Tyrone D. Cannon
- Department of Psychology, and Department of Psychiatry & Biobehavioral Sciences, UCLA, 1285 Franz Hall, Box 951563, Los Angeles, CA 90095-1563, ,
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Filbey FM, Russell T, Morris RG, Murray RM, McDonald C. Functional magnetic resonance imaging (fMRI) of attention processes in presumed obligate carriers of schizophrenia: preliminary findings. Ann Gen Psychiatry 2008; 7:18. [PMID: 18834530 PMCID: PMC2569933 DOI: 10.1186/1744-859x-7-18] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/08/2008] [Accepted: 10/03/2008] [Indexed: 01/03/2023] Open
Abstract
BACKGROUND Presumed obligate carriers (POCs) are the first-degree relatives of people with schizophrenia who, although do not exhibit the disorder, are in direct lineage of it. Thus, this subpopulation of first-degree relatives could provide very important information with regard to the investigation of endophenotypes for schizophrenia that could clarify the often contradictory findings in schizophrenia high-risk populations. To date, despite the extant literature on schizophrenia endophenotypes, we are only aware of one other study that examined the neural mechanisms that underlie cognitive abnormalities in this group. The aim of this study was to investigate whether a more homogeneous group of relatives, such as POCs, have neural abnormalities that may be related to schizophrenia. METHODS We used functional magnetic resonance imaging (fMRI) to collect blood oxygenated level dependent (BOLD) response data in six POCs and eight unrelated healthy controls while performing under conditions of sustained, selective and divided attention. RESULTS The POCs indicated alterations in a widely distributed network of regions involved in attention processes, such as the prefrontal and temporal (including the parahippocampal gyrus) cortices, in addition to the anterior cingulate gyrus. More specifically, a general reduction in BOLD response was found in these areas compared to the healthy participants during attention processes. CONCLUSION These preliminary findings of decreased activity in POCs indicate that this more homogeneous population of unaffected relatives share similar neural abnormalities with people with schizophrenia, suggesting that reduced BOLD activity in the attention network may be an intermediate marker for schizophrenia.
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Gooding DC, Burroughs S, Boutros NN. Attentional deficits in cocaine-dependent patients: converging behavioral and electrophysiological evidence. Psychiatry Res 2008; 160:145-54. [PMID: 18555537 PMCID: PMC2546507 DOI: 10.1016/j.psychres.2007.11.019] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/16/2007] [Revised: 10/07/2007] [Accepted: 11/11/2007] [Indexed: 10/21/2022]
Abstract
Although there are several reports of patients with cocaine dependence displaying cognitive deficits, the nature of their information processing deficits is not well characterized. In the present study, the attentional performance of cocaine-dependent patients (n=14) was examined and compared with that of healthy control individuals (n=15). Attention was assessed using an auditory oddball event-related task as well as the Continuous Performance Test (CPT, Identical Pairs version). The cocaine-dependent group displayed P300 amplitude reduction compared to controls. The group difference in P300 response latency did not reach significance. On the CPT, the cocaine-dependent patients displayed significantly poorer discriminability and greater errors of commission than the controls. There was a positive correlation between performance on the oddball event-related task and performance on the CPT. This investigation provides converging behavioral and electrophysiological evidence of attentional deficits in cocaine-dependent patients.
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Affiliation(s)
- Diane Carol Gooding
- University of Wisconsin-Madison, Departments of Psychology and Psychiatry, 1202 West Johnson Street, Madison, WI 53706, USA.
| | - Scott Burroughs
- Wayne State University. Department of Psychiatry and Behavioral Neurosciences, Wayne State University, Detroit, MI, United States
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Yeap S, Kelly SP, Sehatpour P, Magno E, Garavan H, Thakore JH, Foxe JJ. Visual sensory processing deficits in Schizophrenia and their relationship to disease state. Eur Arch Psychiatry Clin Neurosci 2008; 258:305-16. [PMID: 18504634 DOI: 10.1007/s00406-008-0802-2] [Citation(s) in RCA: 67] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/08/2007] [Accepted: 01/17/2008] [Indexed: 11/29/2022]
Abstract
CONTEXT Visual Evoked Potential (VEP) abnormalities have been a fairly consistent finding in patients with schizophrenia, and it has been suggested that electrophysiological markers of early sensory processing may be useful as trait markers for the illness, and for development as potential diagnostic measures. OBJECTIVE Clear amplitude reductions in the occipital P1 component of the VEP (approximately 100 ms), have been repeatedly demonstrated in patients with schizophrenia. Here, we investigated whether the extent of this deficit was related to age, clinical symptoms, medication status and length of illness, in a large cohort of ethnically homogenous patients. DESIGN, SETTING AND PARTICIPANTS VEP responses to simple isolated-check stimuli were examined in 52 DSM-IV diagnosed patients with schizophrenia, and compared with responses from 26 healthy age-matched control subjects. Using high-density electrical scalp recordings, we assessed the integrity of the visual P1 component across the two groups. This study was conducted at St.Vincent's Psychiatric Hospital in Fairview, Dublin, Ireland. RESULTS Substantially reduced P1 amplitude was demonstrated in the patient group compared to controls. The deficit was not linked to age, length of illness or medication status. A small positive correlation, accounting for about 11% of the variance, was found between P1 amplitude and clinical symptoms scales (BPRS and SANS). In addition, we found that a slightly later (~110 ms) fronto-central component was relatively increased in the patient group, and was inversely correlated with the occipital P1 amplitude in the patients, but not in the healthy control subjects. CONCLUSIONS Our findings clearly demonstrate a deficit in early visual processing in patients with schizophrenia (with a large effect size; Cohen's d = 0.7) that is unrelated to chronicity. The results are consistent with recent findings showing that the P1 deficit is endophenotypic of the disorder and related to genetic risk factors rather than the disease process itself.
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Affiliation(s)
- Sherlyn Yeap
- The Cognitive Neurophysiology Laboratory, St. Vincent's Hospital, Richmond Road, Fairview, Dublin 3, Ireland
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