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Harkness K, Bray S, Murias K. The role of stimulant washout status in functional connectivity of default mode and fronto-parietal networks in children with neurodevelopmental conditions. RESEARCH IN DEVELOPMENTAL DISABILITIES 2024; 146:104691. [PMID: 38340416 DOI: 10.1016/j.ridd.2024.104691] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/28/2023] [Revised: 01/22/2024] [Accepted: 01/24/2024] [Indexed: 02/12/2024]
Abstract
BACKGROUND Stimulant medication is the primary pharmacological treatment for attention dysregulation and is commonly prescribed for children with Attention-Deficit/Hyperactivity Disorder (ADHD) and Autism. Neuroimaging studies of these groups commonly use a 24-48-hour washout period to mediate the effects of stimulant medication on functional connectivity (FC) metrics. However, the impact of washout on functional connectivity has received limited study. METHODS We used fMRI data from participants with diagnosis of Autism and ADHD (and an off stimulant control) from the Adolescent Brain and Cognitive Development (ABCD) and Autism Brain Imaging Data Exchange (ABIDE) databases to explore the effect of simulant washout on FC. Connectivity within and between the default mode (DMN) and fronto-parietal networks (FPN) was examined, as these networks have previously been implicated in attention dysregulation and associated with stimulant medication usage. For each diagnostic group, we assessed effects in interconnectivity between DMN and FPN, intraconnectivity within DMN, and intraconnectivity within FPN. RESULTS We found no significant effect of medication status in intra- and inter-connectivity of the DMN and the FPN in either diagnostic group. IMPLICATIONS Our findings suggest that more information is needed about the effect of stimulant medication, and washout, on the FC of attention networks in clinical populations.
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Affiliation(s)
- Kelsey Harkness
- Department of Graduate Studies, University of Calgary, Canada; Hotchkiss Brain Institute, Cumming School of Medicine, Canada; Alberta Children's Hospital Research Institute, Canada.
| | - Signe Bray
- Hotchkiss Brain Institute, Cumming School of Medicine, Canada; Alberta Children's Hospital Research Institute, Canada; Cumming School of Medicine, University of Calgary, Canada
| | - Kara Murias
- Hotchkiss Brain Institute, Cumming School of Medicine, Canada; Alberta Children's Hospital Research Institute, Canada; Cumming School of Medicine, University of Calgary, Canada
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2
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Chang SE, Lenartowicz A, Hellemann GS, Uddin LQ, Bearden CE. Variability in Cognitive Task Performance in Early Adolescence Is Associated With Stronger Between-Network Anticorrelation and Future Attention Problems. BIOLOGICAL PSYCHIATRY GLOBAL OPEN SCIENCE 2023; 3:948-957. [PMID: 37881561 PMCID: PMC10593900 DOI: 10.1016/j.bpsgos.2022.11.003] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/15/2022] [Revised: 09/22/2022] [Accepted: 11/09/2022] [Indexed: 11/28/2022] Open
Abstract
Background Intraindividual variability (IIV) during cognitive task performance is a key behavioral index of attention and a consistent marker of attention-deficit/hyperactivity disorder. In adults, lower IIV has been associated with anticorrelation between the default mode network (DMN) and dorsal attention network (DAN)-thought to underlie effective allocation of attention. However, whether these behavioral and neural markers of attention are 1) associated with each other and 2) can predict future attention-related deficits has not been examined in a developmental, population-based cohort. Methods We examined relationships at the baseline visit between IIV on 3 cognitive tasks, DMN-DAN anticorrelation, and parent-reported attention problems using data from the Adolescent Brain Cognitive Development (ABCD) Study (N = 11,878 participants, ages 9 to 10 years, female = 47.8%). We also investigated whether behavioral and neural markers of attention at baseline predicted attention problems 1, 2, and 3 years later. Results At baseline, greater DMN-DAN anticorrelation was associated with lower IIV across all 3 cognitive tasks (B = 0.22 to 0.25). Older age at baseline was associated with stronger DMN-DAN anticorrelation and lower IIV (B = -0.005 to -0.0004). Weaker DMN-DAN anticorrelation and IIV were cross-sectionally associated with attention problems (B = 1.41 to 7.63). Longitudinally, lower IIV at baseline was associated with less severe attention problems 1 to 3 years later, after accounting for baseline attention problems (B = 0.288 to 0.77). Conclusions The results suggest that IIV in early adolescence is associated with worsening attention problems in a representative cohort of U.S. youth. Attention deficits in early adolescence may be important for understanding and predicting future cognitive and clinical outcomes.
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Affiliation(s)
- Sarah E. Chang
- Department of Psychiatry and Biobehavioral Sciences, Semel Institute for Neuroscience and Human Behavior, University of California, Los Angeles, Los Angeles, California
| | - Agatha Lenartowicz
- Department of Psychiatry and Biobehavioral Sciences, Semel Institute for Neuroscience and Human Behavior, University of California, Los Angeles, Los Angeles, California
| | - Gerhard S. Hellemann
- Department of Psychiatry and Biobehavioral Sciences, Semel Institute for Neuroscience and Human Behavior, University of California, Los Angeles, Los Angeles, California
- Department of Public Health, University of Alabama at Birmingham, Birmingham, Alabama
| | - Lucina Q. Uddin
- Department of Psychiatry and Biobehavioral Sciences, Semel Institute for Neuroscience and Human Behavior, University of California, Los Angeles, Los Angeles, California
| | - Carrie E. Bearden
- Department of Psychiatry and Biobehavioral Sciences, Semel Institute for Neuroscience and Human Behavior, University of California, Los Angeles, Los Angeles, California
- Department of Psychology, University of California, Los Angeles, Los Angeles, California
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3
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Marcos-Vidal L, Martínez-García M, Martín de Blas D, Navas-Sánchez FJ, Pretus C, Ramos-Quiroga JA, Richarte V, Vilarroya Ó, Sepulcre J, Desco M, Carmona S. Local Functional Connectivity as a Parsimonious Explanation of the Main Frameworks for ADHD in Medication-Naïve Adults. J Atten Disord 2022; 26:1788-1801. [PMID: 35684934 DOI: 10.1177/10870547221101646] [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] [Indexed: 11/16/2022]
Abstract
Objective: Neuroimaging studies in children with ADHD indicate that their brain exhibits an atypical functional connectivity pattern characterized by increased local connectivity and decreased distant connectivity. We aim to evaluate if the local and distant distribution of functional connectivity is also altered in adult samples with ADHD who have never received medication before. Methods: We compared local and distant functional connectivity between 31 medication-naïve adults with ADHD and 31 healthy controls and tested whether this pattern was associated with symptoms severity scores. Results: ADHD sample showed increased local connectivity in the dACC and the SFG and decreased local connectivity in the PCC. Conclusion: Results parallel those obtained in children samples suggesting a deficient integration within the DMN and segregation between DMN, FPN, and VAN. These results are consistent with the three main frameworks that explain ADHD: the neurodevelopmental delay hypothesis, the DMN interference hypothesis, and multi-network models.
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Affiliation(s)
- Luis Marcos-Vidal
- Universidad Carlos III de Madrid, Madrid, Spain.,Instituto de Investigación Gregorio Marañón, Madrid, Spain.,Centro de Investigación Biomédica En Red de Salud Mental, Madrid, Spain
| | - Magdalena Martínez-García
- Instituto de Investigación Gregorio Marañón, Madrid, Spain.,Centro de Investigación Biomédica En Red de Salud Mental, Madrid, Spain
| | | | | | - Clara Pretus
- Unitat de Reserca en Neurociencia Cognitiva, Departament de Psiquiatría i Neurociencia Legal, Universitat Autònoma de Barcelona, Spain.,Hospital del Mar Medical Research Institute, Barcelona, Spain
| | - Josep Antoni Ramos-Quiroga
- Centro de Investigación Biomédica En Red de Salud Mental, Madrid, Spain.,Psychiatry Department, Vall d'Hebron University Hospital, Barcelona, Spain.,Group of Psychiatry, Mental Health and Addiction, Vall d'Hebron Research Institute, Barcelona, Spain
| | - Vanesa Richarte
- Centro de Investigación Biomédica En Red de Salud Mental, Madrid, Spain.,Psychiatry Department, Vall d'Hebron University Hospital, Barcelona, Spain.,Group of Psychiatry, Mental Health and Addiction, Vall d'Hebron Research Institute, Barcelona, Spain
| | - Óscar Vilarroya
- Unitat de Reserca en Neurociencia Cognitiva, Departament de Psiquiatría i Neurociencia Legal, Universitat Autònoma de Barcelona, Spain.,Hospital del Mar Medical Research Institute, Barcelona, Spain
| | - Jorge Sepulcre
- Department of Radiology, Athinoula A. Martinos Center for Biomedical Imaging, Massachusetts General Hospital and Harvard Medical School, Charlestown, MA, USA.,Division of Nuclear Medicine and Molecular Imaging, Department of Radiology, Massachusetts General Hospital and Harvard Medical School, Boston, MA, USA
| | - Manuel Desco
- Universidad Carlos III de Madrid, Madrid, Spain.,Instituto de Investigación Gregorio Marañón, Madrid, Spain.,Centro de Investigación Biomédica En Red de Salud Mental, Madrid, Spain.,Fundación Centro Nacional de Investigaciones Cardiovasculares Carlos III, Madrid, Spain
| | - Susanna Carmona
- Universidad Carlos III de Madrid, Madrid, Spain.,Instituto de Investigación Gregorio Marañón, Madrid, Spain.,Centro de Investigación Biomédica En Red de Salud Mental, Madrid, Spain
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4
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Marcos-Vidal L, Martínez-García M, Martín-de Blas D, Navas-Sánchez FJ, Pretus C, Ramos-Quiroga JA, Richarte V, Vilarroya Ó, Sepulcre J, Desco M, Carmona S. Local Functional Connectivity as a Parsimonious Explanation of the Main Frameworks for ADHD in Medication-Naïve Adults. J Atten Disord 2022; 26:1563-1575. [PMID: 35947490 DOI: 10.1177/10870547211031998] [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] [Indexed: 11/15/2022]
Abstract
OBJECTIVE Neuroimaging studies in children with ADHD indicate that their brain exhibits an atypical functional connectivity pattern characterized by increased local connectivity and decreased distant connectivity. We aim to evaluate if the local and distant distribution of functional connectivity is also altered in adult samples with ADHD who have never received medication before. METHODS We compared local and distant functional connectivity between 31 medication-naïve adults with ADHD and 31 healthy controls and tested whether this pattern was associated with symptoms severity scores. RESULTS ADHD sample showed increased local connectivity in the dACC and the SFG and decreased local connectivity in the PCC. CONCLUSION Results parallel those obtained in children samples suggesting a deficient integration within the DMN and segregation between DMN, FPN, and VAN. These results are consistent with the three main frameworks that explain ADHD: the neurodevelopmental delay hypothesis, the DMN interference hypothesis and multi-network models.
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Affiliation(s)
- Luis Marcos-Vidal
- Universidad Carlos III de Madrid, Spain.,Instituto de Investigación Sanitaria Gregorio Marañón, Madrid, Spain.,Health Institute Carlos III, Madrid, Spain
| | - Magdalena Martínez-García
- Instituto de Investigación Sanitaria Gregorio Marañón, Madrid, Spain.,Health Institute Carlos III, Madrid, Spain
| | | | | | - Clara Pretus
- Universitat Autònoma de Barcelona, Spain.,Fundació Institut Mar d'Investigacions Mèdiques, Barcelona, Spain
| | - Josep Antoni Ramos-Quiroga
- Health Institute Carlos III, Madrid, Spain.,Vall d'Hebron University Hospital, Barcelona, Spain.,Vall d'Hebron Research Institute, Barcelona, Spain
| | - Vanesa Richarte
- Health Institute Carlos III, Madrid, Spain.,Vall d'Hebron University Hospital, Barcelona, Spain.,Vall d'Hebron Research Institute, Barcelona, Spain
| | - Óscar Vilarroya
- Universitat Autònoma de Barcelona, Spain.,Fundació Institut Mar d'Investigacions Mèdiques, Barcelona, Spain
| | - Jorge Sepulcre
- Massachusetts General Hospital and Harvard Medical School, Charlestown, USA
| | - Manuel Desco
- Universidad Carlos III de Madrid, Spain.,Instituto de Investigación Sanitaria Gregorio Marañón, Madrid, Spain.,Health Institute Carlos III, Madrid, Spain.,Fundación Centro Nacional de Investigaciones Cardiovasculares Carlos III, Madrid, Spain
| | - Susanna Carmona
- Universidad Carlos III de Madrid, Spain.,Instituto de Investigación Sanitaria Gregorio Marañón, Madrid, Spain.,Health Institute Carlos III, Madrid, Spain
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Merrill BM, Raiker JS, Mattfeld AT, Macphee FL, Ramos MC, Zhao X, Altszuler AR, Schooler JW, Coxe S, Gnagy EM, Greiner AR, Coles EK, Pelham WE. Mind-Wandering and Childhood ADHD: Experimental Manipulations across Laboratory and Naturalistic Settings. Res Child Adolesc Psychopathol 2022; 50:1139-1149. [PMID: 35247108 PMCID: PMC11103794 DOI: 10.1007/s10802-022-00912-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 02/24/2022] [Indexed: 10/18/2022]
Abstract
The conceptual overlap between mind-wandering and attention-deficit/hyperactivity disorder (ADHD)-related impairments is considerable, yet little experimental research examining this overlap among children is available. The current study aims to experimentally manipulate mind-wandering among children with and without ADHD and examine effects on task performance. Participants were 59 children with ADHD and 55 age-matched controls. Participants completed a novel mind-wandering sustained attention to response task (SART) that included non-self-referential and self-referential stimuli to experimentally increase self-referential mind-wandering, reflected by increases in reaction time variability (RTV) following self-referential stimuli. The ADHD group participated in a classroom study with analogue conditions aimed at encouraging self-referential future-oriented thinking (free play/movie before and after class work) compared to a control condition (newscast) and a cross-over methylphenidate trial. The significant interaction between ADHD status and self-referential stimuli on SART performance indicated that self-referential stimuli led to greater RTV among children with ADHD (within-subject d = 1.29) but not among controls. Methylphenidate significantly reduced RTV among youth with ADHD across self-referential (d = 1.07) and non-self-referential conditions (d = 0.72). In the ADHD classroom study, the significant interaction between mind-wandering condition and methylphenidate indicated that methylphenidate led to higher work completion (ds > 5.00), and the free-play mind-wandering condition had more consistent detrimental effects on productivity (ds ≥ 1.25) than the movie mind-wandering condition. This study is the first to manipulate mind-wandering and assess effects among children with ADHD using a behavioral task. Results provide evidence that children with ADHD are uniquely susceptible to mind-wandering interference.
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Affiliation(s)
- Brittany M Merrill
- Center for Children and Families, Florida International University, Miami, FL, USA.
- Department of Psychology, Florida International University, Miami, FL, USA.
| | - Joseph S Raiker
- Center for Children and Families, Florida International University, Miami, FL, USA
- Department of Psychology, Florida International University, Miami, FL, USA
| | - Aaron T Mattfeld
- Center for Children and Families, Florida International University, Miami, FL, USA
- Department of Psychology, Florida International University, Miami, FL, USA
| | - Fiona L Macphee
- Center for Children and Families, Florida International University, Miami, FL, USA
- Department of Psychology, Florida International University, Miami, FL, USA
| | - Marcela C Ramos
- Center for Children and Families, Florida International University, Miami, FL, USA
- Department of Psychology, Florida International University, Miami, FL, USA
| | - Xin Zhao
- Center for Children and Families, Florida International University, Miami, FL, USA
- Department of Psychology, Florida International University, Miami, FL, USA
| | - Amy R Altszuler
- Center for Children and Families, Florida International University, Miami, FL, USA
- Department of Psychology, Florida International University, Miami, FL, USA
| | | | - Stefany Coxe
- Center for Children and Families, Florida International University, Miami, FL, USA
- Department of Psychology, Florida International University, Miami, FL, USA
| | - Elizabeth M Gnagy
- Center for Children and Families, Florida International University, Miami, FL, USA
| | - Andrew R Greiner
- Center for Children and Families, Florida International University, Miami, FL, USA
| | - Erika K Coles
- Center for Children and Families, Florida International University, Miami, FL, USA
- Department of Psychology, Florida International University, Miami, FL, USA
| | - William E Pelham
- Center for Children and Families, Florida International University, Miami, FL, USA
- Department of Psychology, Florida International University, Miami, FL, USA
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6
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Flannery JS, Riedel MC, Hill-Bowen LD, Poudel R, Bottenhorn KL, Salo T, Laird AR, Gonzalez R, Sutherland MT. Altered large-scale brain network interactions associated with HIV infection and error processing. Netw Neurosci 2022; 6:791-815. [PMID: 36605414 PMCID: PMC9810366 DOI: 10.1162/netn_a_00241] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/25/2021] [Accepted: 02/14/2022] [Indexed: 01/07/2023] Open
Abstract
Altered activity within and between large-scale brain networks has been implicated across various neuropsychiatric conditions. However, patterns of network dysregulation associated with human immunodeficiency virus (HIV), and further impacted by cannabis (CB) use, remain to be delineated. We examined the impact of HIV and CB on resting-state functional connectivity (rsFC) between brain networks and associations with error awareness and error-related network responsivity. Participants (N = 106), stratified into four groups (HIV+/CB+, HIV+/CB-, HIV-/CB+, HIV-/CB-), underwent fMRI scanning while completing a resting-state scan and a modified Go/NoGo paradigm assessing brain responsivity to errors and explicit error awareness. We examined separate and interactive effects of HIV and CB on resource allocation indexes (RAIs), a measure quantifying rsFC strength between the default mode network (DMN), central executive network (CEN), and salience network (SN). We observed reduced RAIs among HIV+ (vs. HIV-) participants, which was driven by increased SN-DMN rsFC. No group differences were detected for SN-CEN rsFC. Increased SN-DMN rsFC correlated with diminished error awareness, but not with error-related network responsivity. These outcomes highlight altered network interactions among participants with HIV and suggest such rsFC dysregulation may persist during task performance, reflecting an inability to disengage irrelevant mental operations, ultimately hindering error processing.
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Affiliation(s)
- Jessica S. Flannery
- Department of Psychology and Neuroscience, University of North Carolina at Chapel Hill, Chapel Hill, NC, USA
| | - Michael C. Riedel
- Department of Physics, Florida International University, Miami, FL, USA
| | | | - Ranjita Poudel
- Department of Psychology, Florida International University, Miami, FL, USA
| | - Katherine L. Bottenhorn
- Department of Population and Public Health Sciences, University of Southern California, Los Angeles, CA, USA
| | - Taylor Salo
- Department of Psychology, Florida International University, Miami, FL, USA
| | - Angela R. Laird
- Department of Physics, Florida International University, Miami, FL, USA
| | - Raul Gonzalez
- Department of Psychology, Florida International University, Miami, FL, USA
| | - Matthew T. Sutherland
- Department of Psychology, Florida International University, Miami, FL, USA,* Corresponding Author:
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7
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Kim SM, Min KJ, Han DH. Effects of Methylphenidate on Somatic Symptoms and Brain Functional Connectivity in Adolescents with Attention Deficit Hyperactivity Disorder: A Pilot Study. CLINICAL PSYCHOPHARMACOLOGY AND NEUROSCIENCE 2022; 20:259-270. [PMID: 35466097 PMCID: PMC9048013 DOI: 10.9758/cpn.2022.20.2.259] [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: 12/07/2020] [Revised: 03/01/2021] [Accepted: 03/03/2021] [Indexed: 01/10/2023]
Abstract
Objective This study aimed to evaluate whether somatic symptoms in adolescents with attention deficit hyperactivity disorder (ADHD) are associated with a dissociative pattern of functional connectivity (FC) within the default mode network (DMN) and whether methylphenidate administration can improve clinical and somatic symptoms. We also evaluated whether the improvement of somatic symptoms is associated with increased FC within the DMN in response to methylphenidate treatment. Methods Fifteen male adolescents with somatic symptoms of ADHD and 15 male adolescents with ADHD without somatic symptoms were included. At baseline and after 6 months of methylphenidate treatment, all adolescents were asked to complete questionnaires for the Korean version of the Dupaul’s ADHD rating scale, the symptom checklist-90- revised-somatization subscales, the Beck Depression Inventory, and the Beck Anxiety Inventory. Additionally, a resting-state functional magnetic resonance imaging scan was conducted. Results Methylphenidate treatment improved clinical and somatic symptoms in adolescents with ADHD. In addition, it increased brain FC within the DMN from the posterior cingulate cortex (posterior DMN) to the middle prefrontal cortex (anterior DMN). The improvement of somatic symptoms was associated with FC within the DMN from the posterior cingulate cortex to the middle prefrontal cortex in ADHD adolescents with somatic symptoms. Conclusion Methylphenidate increased brain FC between the anterior and posterior DMN. The improvement of somatic symptoms in adolescents with ADHD was associated with FC within the DMN. The DMN in adolescents with ADHD seems to be associated with the severity of the clinical and somatic symptoms of ADHD.
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Affiliation(s)
- Sun Mi Kim
- Department of Psychiatry, Chung-Ang University College of Medicine, Seoul, Korea
| | - Kyung Joon Min
- Department of Psychiatry, Chung-Ang University College of Medicine, Seoul, Korea
| | - Doug Hyun Han
- Department of Psychiatry, Chung-Ang University College of Medicine, Seoul, Korea
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8
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Tripathi V, Garg R. Weak Task Synchronization of Default Mode Network in Task Based Paradigms. Neuroimage 2022; 251:118940. [PMID: 35121184 DOI: 10.1016/j.neuroimage.2022.118940] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/16/2021] [Revised: 01/21/2022] [Accepted: 01/25/2022] [Indexed: 11/15/2022] Open
Abstract
The brains Default mode network (DMN) is generally characterized by brain areas that gets deactivated upon the presentation of a wide variety of externally focused, attention demanding tasks. These areas also exhibit significant intra-DMN functional connectivity and significant negative functional connectivity with other brain areas, especially with attention networks, in both resting state and task conditions. Therefore, the DMN has been hypothesized to be involved in internally directed cognitive activities such as autobiographical recall of the past, future planning and mind wandering. Recent research has discovered the role of bottom-up attention in modulating the behaviour of DMN. We hypothesize that the de-engagement of the DMN regions upon the presentation of an externally-focused attention-demanding stimulus may not be strictly stimulus locked and may exhibit significant trial-to-trial as well as subject-to-subject variability. Due to the involvement of frontoparietal control network in modulating the anticorrelations between DMN and dorsal attention network (DAN), we expect the DMN regions to have lower inter-trial and inter-subject synchronization in their fMRI BOLD responses as compared to the bottom-up early-sensory task-positive regions. To test this hypothesis, we designed new statistical methods called Inter Trial Temporal Synchronization Analysis (IT-TSA) and Inter Subject TSA (IS-TSA) to analyse variability across trials and subjects respectively. We analysed four publicly available datasets (total 223 subjects) across seven tasks related to different cognitive modalities and found out that there is significantly low stimulus-locked synchronization across trials and subjects in the DMN regions as compared to early sensory task positive regions. Our study challenges the understanding of DMN as a strictly task-negative region and supports the recent findings that DMN acts as an active component associated with intrinsic processing which deactivates differentially and non-linearly across trials and subjects in the presence of extrinsic processes.
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Affiliation(s)
- Vaibhav Tripathi
- Department of Psychological and Brain Sciences, Boston University, MA, 02215, USA.
| | - Rahul Garg
- Department of Computer Science and Engineering, Indian Institute of Technology, Delhi, 110052, India; Amar Nath and Shashi Khosla School of Information Technology, Indian Institute of Technology, Delhi, 110052, India; National Resource Centre for Value Education in Engineering, Indian Institute of Technology, Delhi, 110052, India
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9
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Ding K, Wang H, Li C, Liu F, Yu D. Decreased Right Prefrontal Synchronization Strength and Asymmetry During Joint Attention in the Left-Behind Children: A Functional Near-Infrared Spectroscopy Study. Front Physiol 2021; 12:759788. [PMID: 34867465 PMCID: PMC8634881 DOI: 10.3389/fphys.2021.759788] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/17/2021] [Accepted: 10/11/2021] [Indexed: 11/24/2022] Open
Abstract
Although there are millions of left-behind children in China, the researches on brain structure and functions in left-behind children are not sufficient at the brain imaging level. This study aimed to explore whether there is decreased prefrontal synchronization during joint attention in left-behind children. Sixty children (65.12 ± 6.54 months, 29 males) with 34 left-behind children were recruited. The functional near-infrared spectroscopy (fNIRS) imaging data from the prefrontal cortex during joint attention, as well as behavioral measures (associated with family income, intelligence, language, and social-emotional abilities), were collected. Results verified that brain imaging data and behavioral measures are correlative and support that left-behind children have deficits in social-emotional abilities. More importantly, left-behind children showed decreased synchronization strength and asymmetry in the right middle frontal gyrus during joint attention. The findings suggest that decreased right prefrontal synchronization strength and asymmetry during joint attention might be vulnerability factors in the development of left-behind children.
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Affiliation(s)
- Keya Ding
- Key Laboratory of Child Development and Learning Science, Research Center for Learning Science, Southeast University, Nanjing, China.,School of Biological Science and Medical Engineering, Southeast University, Nanjing, China
| | - Hongan Wang
- Key Laboratory of Child Development and Learning Science, Research Center for Learning Science, Southeast University, Nanjing, China.,School of Biological Science and Medical Engineering, Southeast University, Nanjing, China
| | - Chuanjiang Li
- Hangzhou College of Early Childhood Teachers' Education, Zhejiang Normal University, Hangzhou, China
| | - Fulin Liu
- Key Laboratory of Child Development and Learning Science, Research Center for Learning Science, Southeast University, Nanjing, China.,School of Biological Science and Medical Engineering, Southeast University, Nanjing, China
| | - Dongchuan Yu
- Key Laboratory of Child Development and Learning Science, Research Center for Learning Science, Southeast University, Nanjing, China.,School of Biological Science and Medical Engineering, Southeast University, Nanjing, China.,Department of Child Development and Behavior, Third Affiliated Hospital of Zhengzhou University, Zhengzhou, China
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10
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Yang Y, Yang B, Zhang L, Peng G, Fang D. Dynamic Functional Connectivity Reveals Abnormal Variability in the Amygdala Subregions of Children With Attention-Deficit/Hyperactivity Disorder. Front Neurosci 2021; 15:648143. [PMID: 34658751 PMCID: PMC8514188 DOI: 10.3389/fnins.2021.648143] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/31/2020] [Accepted: 09/06/2021] [Indexed: 11/17/2022] Open
Abstract
Objective: This study investigates whether the dynamic functional connectivity (dFC) of the amygdala subregions is altered in children with attention-deficit/hyperactivity disorder (ADHD). Methods: The dFC of the amygdala subregions was systematically calculated using a sliding time window method, for 75 children with ADHD and 20 healthy control (HC) children. Results: Compared with the HC group, the right superficial amygdala exhibited significantly higher dFC with the right prefrontal cortex, the left precuneus, and the left post-central gyrus for children in the ADHD group. The dFC of the amygdala subregions showed a negative association with the cognitive functions of children in the ADHD group. Conclusion: Functional connectivity of the amygdala subregions is more unstable among children with ADHD. In demonstrating an association between the stability of functional connectivity of the amygdala and cognitive functions, this study may contribute by providing a new direction for investigating the internal mechanism of ADHD.
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Affiliation(s)
- Yue Yang
- Children's Healthcare & Mental Health Center, Shenzhen Children's Hospital, Shenzhen, China
| | - Binrang Yang
- Children's Healthcare & Mental Health Center, Shenzhen Children's Hospital, Shenzhen, China
| | - Linlin Zhang
- Children's Healthcare & Mental Health Center, Shenzhen Children's Hospital, Shenzhen, China
| | - Gang Peng
- Children's Healthcare & Mental Health Center, Shenzhen Children's Hospital, Shenzhen, China
| | - Diangang Fang
- Children's Healthcare & Mental Health Center, Shenzhen Children's Hospital, Shenzhen, China
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11
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Kowalczyk OS, Mehta MA, O’Daly OG, Criaud M. Task-based functional connectivity in attention-deficit/hyperactivity disorder: A systematic review. BIOLOGICAL PSYCHIATRY GLOBAL OPEN SCIENCE 2021; 2:350-367. [DOI: 10.1016/j.bpsgos.2021.10.006] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/02/2021] [Revised: 10/07/2021] [Accepted: 10/11/2021] [Indexed: 11/30/2022] Open
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12
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Ahmadi M, Kazemi K, Kuc K, Cybulska-Klosowicz A, Helfroush MS, Aarabi A. Resting state dynamic functional connectivity in children with attention deficit/hyperactivity disorder. J Neural Eng 2021; 18. [PMID: 34289458 DOI: 10.1088/1741-2552/ac16b3] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/29/2021] [Accepted: 07/21/2021] [Indexed: 11/11/2022]
Abstract
Attention deficit/hyperactivity disorder (ADHD) is characterized by inattention, hyperactivity and impulsivity. In this study, we investigated group differences in dynamic functional connectivity (dFC) between 113 children with inattentive (46 ADHDI) and combined (67 ADHDC) ADHD and 76 typically developing (TD) children using resting-state functional MRI data. For dynamic connectivity analysis, the data were first decomposed into 100 independent components, among which 88 were classified into eight well-known resting-state networks (RSNs). Three discrete FC states were then identified using k-means clustering and used to estimate transition probabilities between states in both patient and control groups using a hidden Markov model. Our results showed state-dependent alterations in intra and inter-network connectivity in both ADHD subtypes in comparison with TD. Spending less time than healthy controls in state 1, both ADHDIand ADHDCwere characterized with weaker intra-hemispheric connectivity with functional asymmetries. In this state, ADHDIfurther showed weaker inter-hemispheric connectivity. The patients spent more time in state 2, exhibiting characteristic abnormalities in corticosubcortical and corticocerebellar connectivity. In state 3, a less frequently state observed across the ADHD and TD children, ADHDCwas differentiated from ADHDIby significant alterations in FC between bilateral temporal regions and other brain areas in comparison with TD. Across all three states, several strategic brain regions, mostly bilateral, exhibited significant alterations in both static functional connectivity (sFC) and dFC in the ADHD groups compared to TD, including inferior, middle and superior temporal gyri, middle frontal gyri, insula, anterior cingulum cortex, precuneus, calcarine, fusiform, superior motor area, and cerebellum. Our results show distributed abnormalities in sFC and dFC between different large-scale RSNs including cortical and subcortical regions in both ADHD subtypes compared to TD. Our findings show that the dynamic changes in brain FC can better explain the underlying pathophysiology of ADHD such as deficits in visual cognition, attention, memory and emotion processing, and cognitive and motor control.
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Affiliation(s)
- Maliheh Ahmadi
- Department of Electrical and Electronics Engineering, Shiraz University of Technology, Shiraz, Iran
| | - Kamran Kazemi
- Department of Electrical and Electronics Engineering, Shiraz University of Technology, Shiraz, Iran
| | - Katarzyna Kuc
- SWPS University of Social Sciences and Humanities, Warsaw, Poland
| | - Anita Cybulska-Klosowicz
- Laboratory of Emotions Neurobiology, Nencki Institute of Experimental Biology, Polish Academy of Sciences, Warsaw, Poland
| | | | - Ardalan Aarabi
- Laboratory of Functional Neuroscience and Pathologies (LNFP EA4559), University Research Center (CURS), University Hospital, Amiens, France.,Faculty of Medicine, University of Picardy Jules Verne, Amiens, France
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13
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Ashinoff BK, Abu-Akel A. Hyperfocus: the forgotten frontier of attention. PSYCHOLOGICAL RESEARCH 2021; 85:1-19. [PMID: 31541305 PMCID: PMC7851038 DOI: 10.1007/s00426-019-01245-8] [Citation(s) in RCA: 31] [Impact Index Per Article: 10.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/24/2019] [Accepted: 09/09/2019] [Indexed: 01/20/2023]
Abstract
'Hyperfocus' is a phenomenon that reflects one's complete absorption in a task, to a point where a person appears to completely ignore or 'tune out' everything else. Hyperfocus is most often mentioned in the context of autism, schizophrenia, and attention deficit hyperactivity disorder, but research into its effect on cognitive and neural functioning is limited. We propose that hyperfocus is a critically important aspect of cognition, particularly with regard to clinical populations, and that it warrants significant investigation. Hyperfocus, though ostensibly self-explanatory, is poorly defined within the literature. In many cases, hyperfocus goes undefined, relying on the assumption that the reader inherently knows what it entails. Thus, there is no single consensus to what constitutes hyperfocus. Moreover, some studies do not refer to hyperfocus by name, but describe processes that may be related. In this paper, we review how hyperfocus (as well as possibly related phenomena) has been defined and measured, the challenges associated with hyperfocus research, and assess how hyperfocus affects both neurotypical and clinical populations. Using this foundation, we provide constructive criticism about previously used methods and analyses. We also propose an operational definition of hyperfocus for researchers to use moving forward.
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Affiliation(s)
- Brandon K Ashinoff
- Department of Psychiatry, Columbia University, 1051 Riverside Dr, New York, NY, 10032, USA.
- Centre for Human Brain Health (CHBH), School of Psychology, University of Birmingham, Edgbaston, Birmingham, B15 2TT, UK.
| | - Ahmad Abu-Akel
- Institute of Psychology, University of Lausanne, Quartier UNIL-Mouline, Geopolis, Lausanne, 1015, Switzerland
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14
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Chang JC, Lin HY, Lv J, Tseng WYI, Gau SSF. Regional brain volume predicts response to methylphenidate treatment in individuals with ADHD. BMC Psychiatry 2021; 21:26. [PMID: 33430830 PMCID: PMC7798216 DOI: 10.1186/s12888-021-03040-5] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/08/2020] [Accepted: 12/24/2020] [Indexed: 12/01/2022] Open
Abstract
BACKGROUND Despite the effectiveness of methylphenidate for treating ADHD, up to 30% of individuals with ADHD show poor responses to methylphenidate. Neuroimaging biomarkers to predict medication responses remain elusive. This study characterized neuroanatomical features that differentiated between clinically good and poor methylphenidate responders with ADHD. METHODS Using a naturalistic observation design selected from a larger cohort, we included 79 drug-naive individuals (aged 6-42 years) with ADHD without major psychiatric comorbidity, who had acceptable baseline structural MRI data quality. Based on a retrospective chart review, we defined responders by individuals' responses to at least one-month treatment with methylphenidate. A nonparametric mass-univariate voxel-based morphometric analysis was used to compare regional gray matter volume differences between good and poor responders. A multivariate pattern recognition based on the support vector machine was further implemented to identify neuroanatomical indicators to predict an individual's response. RESULTS 63 and 16 individuals were classified in the good and poor responder group, respectively. Using the small-volume correction procedure based on the hypothesis-driven striatal and default-mode network masks, poor responders had smaller regional volumes of the left putamen as well as larger precuneus volumes compared to good responders at baseline. The machine learning approach identified that volumetric information among these two regions alongside the left frontoparietal regions, occipital lobes, and posterior/inferior cerebellum could predict clinical responses to methylphenidate in individuals with ADHD. CONCLUSION Our results suggest regional striatal and precuneus gray matter volumes play a critical role in mediating treatment responses in individuals with ADHD.
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Affiliation(s)
- Jung-Chi Chang
- grid.412094.a0000 0004 0572 7815Department of Psychiatry, National Taiwan University Hospital, Taipei, Taiwan ,grid.412094.a0000 0004 0572 7815Department of Psychiatry, National Taiwan University Hospital, Hsin-Chu Branch, Hsin-Chu, Taiwan ,grid.19188.390000 0004 0546 0241Graduate Institute of Clinical Medicine, College of Medicine, National Taiwan University, Taipei, Taiwan
| | - Hsiang-Yuan Lin
- grid.155956.b0000 0000 8793 5925Azrieli Adult Neurodevelopmental Centre and Adult Neurodevelopment and Geriatric Psychiatry Division, Centre for Addiction and Mental Health, Toronto, Ontario Canada ,grid.17063.330000 0001 2157 2938Department of Psychiatry, University of Toronto, Toronto, Ontario Canada
| | - Junglei Lv
- grid.1013.30000 0004 1936 834XSydney Imaging and School of Biomedical Engineering, University of Sydney, Camperdown, NSW Australia
| | - Wen-Yih Issac Tseng
- grid.19188.390000 0004 0546 0241Graduate Institute of Brain and Mind Sciences, National Taiwan University College of Medicine, Taipei, Taiwan ,grid.19188.390000 0004 0546 0241Institute of Medical Device and Imaging, National Taiwan University College of Medicine, Taipei, Taiwan
| | - Susan Shur-Fen Gau
- Department of Psychiatry, National Taiwan University Hospital, Taipei, Taiwan. .,Graduate Institute of Clinical Medicine, College of Medicine, National Taiwan University, Taipei, Taiwan. .,Graduate Institute of Brain and Mind Sciences, National Taiwan University College of Medicine, Taipei, Taiwan. .,Department of Psychiatry, College of Medicine, National Taiwan University, Taipei, Taiwan.
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15
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Knyazev GG, Savostyanov AN, Bocharov AV, Levin EA, Rudych PD. Intrinsic Connectivity Networks in the Self- and Other-Referential Processing. Front Hum Neurosci 2020; 14:579703. [PMID: 33304255 PMCID: PMC7693553 DOI: 10.3389/fnhum.2020.579703] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/03/2020] [Accepted: 10/05/2020] [Indexed: 12/26/2022] Open
Abstract
Neuroimaging studies have revealed a multitude of brain regions associated with self- and other-referential processing, but the question how the distinction between self, close other, and distant other is processed in the brain still remains unanswered. The default mode network (DMN) is the primary network associated with the processing of self, whereas task-positive networks (TPN) are indispensable for the processing of external objects. We hypothesize that self- and close-other-processing would engage DMN more than TPN, whereas distant-other-processing would engage TPN to a greater extent. To test this hypothesis, we used functional magnetic resonance imaging (fMRI) functional connectivity data obtained in the course of a trait adjective judgment task while subjects evaluated themselves, the best friend, a neutral stranger, and an unpleasant person. A positive association between the degree of self-relatedness and the degree of DMN dominance was revealed in cortical midline structures (CMS) and the left lateral prefrontal cortex. Relative to TPN, DMN showed greater connectivity in me than in friend, in friend than in stranger, and in stranger than in unpleasant conditions. These results show that the less the evaluated person is perceived as self-related, the more the balance of activity in the brain shifts from the DMN to the TPN.
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Affiliation(s)
- Gennady G Knyazev
- Laboratory of Psychophysiology of Individual Differences, Institute of Physiology and Basic Medicine, Novosibirsk, Russia
| | - Alexander N Savostyanov
- Laboratory of Psychophysiology of Individual Differences, Institute of Physiology and Basic Medicine, Novosibirsk, Russia.,Joint Laboratory of Psychological Genetics at the Institute of Cytology and Genetics SB RAS, Institute of Physiology and Basic Medicine, Novosibirsk, Russia
| | - Andrey V Bocharov
- Laboratory of Psychophysiology of Individual Differences, Institute of Physiology and Basic Medicine, Novosibirsk, Russia
| | - Evgeny A Levin
- E.N. Meshalkin National Medical Research Center, Novosibirsk, Russia
| | - Pavel D Rudych
- Laboratory of Psychophysiology of Individual Differences, Institute of Physiology and Basic Medicine, Novosibirsk, Russia
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16
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Zhang Y, Yang X, Wang Z. The COMT rs4680 polymorphism, family functioning and preschoolers' attentional control indexed by intraindividual reaction time variability. Dev Psychobiol 2020; 63:713-724. [PMID: 32974928 DOI: 10.1002/dev.22040] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/23/2020] [Revised: 08/20/2020] [Accepted: 08/29/2020] [Indexed: 01/06/2023]
Abstract
Trial-to-trial intraindividual reaction time variability (IIRTV) serves as an index of attentional control and related endogenous brain function. What determinants contribute to preschoolers' attentional control indexed by IIRTV remains unknown. The present study examined how catechol-o-methyltransferase (COMT) rs4680 polymorphism interacted with family functioning (cohesion and adaptability) to impact on preschoolers' attentional control indexed by IIRTV. One hundred forty-four preschool children (Mage = 4.19, SD = 0.63) completed the flanker task to assess their IIRTV. Their parents were asked to fill out the Family Adaptability and Cohesion Evaluation Scale II to assess family functioning. After controlling for age, socioeconomic status (SES) and mean reaction time, results showed that the COMT rs4680 polymorphism was positively associated with preschoolers' IIRTV at the 5% significance level (p = .02) but not after multiple testing adjustment (p = .08). Moreover the COMT rs4680 polymorphism significantly interacted with family functioning to impact on preschoolers' IIRTV and the interaction effects remained significant after correction for multiple testing (p = .01, ΔR2 = 0.06 in congruent conditions; p = .04, ΔR2 = 0.04 in combined conditions). In addition, the significant interaction between SES and COMT rs4680 polymorphism was also found in the present study (p = .01, ΔR2 = 0.05 in congruent conditions; p = .05, ΔR2 = 0.03 in combined conditions). No sex differences were found in the present sample. The findings of the present study expand our knowledge about the gene × environment underpinnings of children's attentional control and endogenous brain function, and provide evidence for the Vantage Sensitivity model on children's development.
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Affiliation(s)
- Yuewen Zhang
- School of Psychology, Shaanxi Normal University, Xi'an, China.,Shaanxi Provincial Key Research Center of Child Mental and Behavioral Health, Xi'an, China
| | - Xiaohui Yang
- School of Psychology, Shaanxi Normal University, Xi'an, China.,Shaanxi Provincial Key Research Center of Child Mental and Behavioral Health, Xi'an, China
| | - Zhenhong Wang
- School of Psychology, Shaanxi Normal University, Xi'an, China.,Shaanxi Provincial Key Research Center of Child Mental and Behavioral Health, Xi'an, China
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17
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Abbas A, Bassil Y, Keilholz S. Quasi-periodic patterns of brain activity in individuals with attention-deficit/hyperactivity disorder. Neuroimage Clin 2019; 21:101653. [PMID: 30690417 PMCID: PMC6356002 DOI: 10.1016/j.nicl.2019.101653] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/02/2018] [Revised: 12/05/2018] [Accepted: 01/03/2019] [Indexed: 11/25/2022]
Abstract
Individuals with attention-deficit/hyperactivity disorder have disrupted functional connectivity in the default mode and task positive networks. Traditional fMRI analysis techniques that focus on 'static' changes in functional connectivity have been successful in identifying differences between healthy controls and individuals with ADHD. However, such analyses are unable to explain the mechanisms behind the functional connectivity differences observed. Here, we study dynamic changes in functional connectivity in individuals with ADHD through investigation of quasi-periodic patterns (QPPs). QPPs are reliably recurring low-frequency spatiotemporal patterns in the brain linked to infra-slow electrical activity. They have been shown to contribute to functional connectivity observed through static analysis techniques. We find that QPPs contribute to functional connectivity specifically in regions that are disrupted in individuals with ADHD. Individuals with ADHD also show differences in the spatiotemporal pattern observed within the QPPs. This difference results in a weaker contribution of QPPs to functional connectivity in the default mode and task positive networks. We conclude that quasi-periodic patterns provide insight into the mechanisms behind functional connectivity differences seen in individuals with ADHD. This allows for a better understanding of the etiology of the disorder and development of effective treatments.
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Affiliation(s)
- Anzar Abbas
- Neuroscience, Emory University, 1760 Haygood Dr NE W200, Atlanta, GA 30322, United States
| | - Yasmine Bassil
- College of Sciences, Georgia Institute of Technology, 225 North Ave, Atlanta, GA 30332, United States
| | - Shella Keilholz
- Neuroscience, Emory University, 1760 Haygood Dr NE W200, Atlanta, GA 30322, United States; Biomedical Engineering, Emory University and Georgia Institute of Technology, 1760 Haygood Dr NE W200, Atlanta, GA 30322, United States.
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18
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Zhou ZW, Fang YT, Lan XQ, Sun L, Cao QJ, Wang YF, Luo H, Zang YF, Zhang H. Inconsistency in Abnormal Functional Connectivity Across Datasets of ADHD-200 in Children With Attention Deficit Hyperactivity Disorder. Front Psychiatry 2019; 10:692. [PMID: 31611824 PMCID: PMC6777421 DOI: 10.3389/fpsyt.2019.00692] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/21/2019] [Accepted: 08/27/2019] [Indexed: 01/22/2023] Open
Abstract
Many studies have shown abnormal functional connectivity in children with attention deficit hyperactivity disorder (ADHD) by using resting-state functional magnetic resonance imaging (rs-fMRI). However, few studies illustrated that to what extent these findings were consistent across different datasets. The present study aimed to assess the consistency of abnormal functional connectivity in children with ADHD across the four datasets from a public-assess rs-fMRI ADHD cohort, namely, ADHD-200. We employed the identical analysis process of previous studies and examined a few factors, including connectivity with the seed regions of the bilateral dorsal anterior cingulate cortex, bilateral inferior frontal gyrus, and bilateral middle frontal gyrus; connectivity between default mode network and executive control network; stringent and lenient statistical thresholds; and the ADHD subtypes. Our results revealed a high inconsistency of abnormal seed-based connectivity in children with ADHD across all datasets, even across three datasets from the same research site. This inconsistency could also be observed with a lenient statistical threshold. Besides, each dataset did not show abnormal connectivity between default mode network and executive control network for ADHD, albeit this abnormal connectivity between networks was intensively reported in previous studies. Importantly, the ADHD combined subtype showed greater consistency than did the inattention subtype. These findings provided methodological insights into the studies on spontaneous brain activity of ADHD, and the ADHD subtypes deserve more attention in future studies.
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Affiliation(s)
- Zhi-Wei Zhou
- Institute of Psychological Sciences, College of Education, Hangzhou Normal University, Hangzhou, China.,Center for Cognition and Brain Disorders and the Affiliated Hospital, Hangzhou Normal University, Hangzhou, China.,Zhejiang Key Laboratory for Research in Assessment of Cognitive Impairments, Hangzhou, China
| | - Yan-Tong Fang
- Center for Cognition and Brain Disorders and the Affiliated Hospital, Hangzhou Normal University, Hangzhou, China
| | - Xia-Qing Lan
- Institute of Psychological Sciences, College of Education, Hangzhou Normal University, Hangzhou, China.,Center for Cognition and Brain Disorders and the Affiliated Hospital, Hangzhou Normal University, Hangzhou, China.,Zhejiang Key Laboratory for Research in Assessment of Cognitive Impairments, Hangzhou, China
| | - Li Sun
- Institute of Mental Health, The Sixth Hospital, Peking University, Beijing, China
| | - Qing-Jiu Cao
- Institute of Mental Health, The Sixth Hospital, Peking University, Beijing, China
| | - Yu-Feng Wang
- Institute of Psychological Sciences, College of Education, Hangzhou Normal University, Hangzhou, China.,Institute of Mental Health, The Sixth Hospital, Peking University, Beijing, China
| | - Hong Luo
- Institute of Psychological Sciences, College of Education, Hangzhou Normal University, Hangzhou, China.,Center for Cognition and Brain Disorders and the Affiliated Hospital, Hangzhou Normal University, Hangzhou, China
| | - Yu-Feng Zang
- Institute of Psychological Sciences, College of Education, Hangzhou Normal University, Hangzhou, China.,Center for Cognition and Brain Disorders and the Affiliated Hospital, Hangzhou Normal University, Hangzhou, China.,Zhejiang Key Laboratory for Research in Assessment of Cognitive Impairments, Hangzhou, China
| | - Hang Zhang
- Institute of Psychological Sciences, College of Education, Hangzhou Normal University, Hangzhou, China.,Center for Cognition and Brain Disorders and the Affiliated Hospital, Hangzhou Normal University, Hangzhou, China.,Zhejiang Key Laboratory for Research in Assessment of Cognitive Impairments, Hangzhou, China
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19
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Rubia K, Criaud M, Wulff M, Alegria A, Brinson H, Barker G, Stahl D, Giampietro V. Functional connectivity changes associated with fMRI neurofeedback of right inferior frontal cortex in adolescents with ADHD. Neuroimage 2018; 188:43-58. [PMID: 30513395 PMCID: PMC6414400 DOI: 10.1016/j.neuroimage.2018.11.055] [Citation(s) in RCA: 40] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2018] [Revised: 11/28/2018] [Accepted: 11/29/2018] [Indexed: 11/21/2022] Open
Abstract
Attention Deficit Hyperactivity Disorder (ADHD) is associated with poor self-control, underpinned by inferior fronto-striatal deficits. We showed previously that 18 ADHD adolescents over 11 runs of 8.5 min of real-time functional magnetic resonance neurofeedback of the right inferior frontal cortex (rIFC) progressively increased activation in 2 regions of the rIFC which was associated with clinical symptom improvement. In this study, we used functional connectivity analyses to investigate whether fMRI-Neurofeedback of rIFC resulted in dynamic functional connectivity changes in underlying neural networks. Whole-brain seed-based functional connectivity analyses were conducted using the two clusters showing progressively increased activation in rIFC as seed regions to test for changes in functional connectivity before and after 11 fMRI-Neurofeedback runs. Furthermore, we tested whether the resulting functional connectivity changes were associated with clinical symptom improvements and whether they were specific to fMRI-Neurofeedback of rIFC when compared to a control group who had to self-regulate another region. rIFC showed increased positive functional connectivity after relative to before fMRI-Neurofeedback with dorsal caudate and anterior cingulate and increased negative functional connectivity with regions of the default mode network (DMN) such as posterior cingulate and precuneus. Furthermore, the functional connectivity changes were correlated with clinical improvements and the functional connectivity and correlation findings were specific to the rIFC-Neurofeedback group. The findings show for the first time that fMRI-Neurofeedback of a typically dysfunctional frontal region in ADHD adolescents leads to strengthening within fronto-cingulo-striatal networks and to weakening of functional connectivity with posterior DMN regions and that this may be underlying clinical improvement.
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Affiliation(s)
- K Rubia
- Department of Child and Adolescent Psychiatry, Institute of Psychiatry, Psychology and Neuroscience, King's College London, UK.
| | - M Criaud
- Department of Child and Adolescent Psychiatry, Institute of Psychiatry, Psychology and Neuroscience, King's College London, UK
| | - M Wulff
- Department of Child and Adolescent Psychiatry, Institute of Psychiatry, Psychology and Neuroscience, King's College London, UK
| | - A Alegria
- Department of Child and Adolescent Psychiatry, Institute of Psychiatry, Psychology and Neuroscience, King's College London, UK
| | - H Brinson
- Department of Child and Adolescent Psychiatry, Institute of Psychiatry, Psychology and Neuroscience, King's College London, UK
| | - G Barker
- Department of Neuroimaging, Institute of Psychiatry, Psychology & Neuroscience, King's College London, UK
| | - D Stahl
- Department of Biostatistics & Health Informatics, King's College London, UK
| | - V Giampietro
- Department of Neuroimaging, Institute of Psychiatry, Psychology & Neuroscience, King's College London, UK
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20
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Cary RP, Ray S, Grayson DS, Painter J, Carpenter S, Maron L, Sporns O, Stevens AA, Nigg JT, Fair DA. Network Structure among Brain Systems in Adult ADHD is Uniquely Modified by Stimulant Administration. Cereb Cortex 2018; 27:3970-3979. [PMID: 27422412 DOI: 10.1093/cercor/bhw209] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/06/2016] [Accepted: 07/06/2016] [Indexed: 11/12/2022] Open
Abstract
Current research in connectomics highlights that self-organized functional networks or "communities" of cortical areas can be detected in the adult brain. This perspective may provide clues to mechanisms of treatment response in psychiatric conditions. Here we examine functional brain community topology based on resting-state fMRI in adult Attention-Deficit/Hyperactivity Disorder (ADHD; n = 22) and controls (n = 31). We sought to evaluate ADHD patterns in adulthood and their modification by short term stimulants administration. Participants with ADHD were scanned one or two weeks apart, once with medication and once without; comparison participants were scanned at one time-point. Functional connectivity was estimated from these scans and community detection applied to determine cortical network topology. Measures of change in connectivity profile were calculated via a graph measure, termed the Node Dissociation Index (NDI). Compared to controls, several cortical networks had atypical connectivity in adults with ADHD when withholding stimulants, as measured by NDI. In most networks stimulants significantly reduced, but did not eliminate, differences in the distribution of connections between key brain systems relative to the control sample. These findings provide an enriched model of connectivity in ADHD and demonstrate how stimulants may exert functional effects by altering connectivity profiles in the brain.
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Affiliation(s)
- Robert P Cary
- Department of Behavioral Neuroscience, Oregon Health & Science University, USA.,Department of Psychiatry, Oregon Health & Science University, USA
| | - Siddharth Ray
- Department of Behavioral Neuroscience, Oregon Health & Science University, USA
| | - David S Grayson
- Department of Behavioral Neuroscience, Oregon Health & Science University, USA
| | - Julia Painter
- Department of Behavioral Neuroscience, Oregon Health & Science University, USA
| | - Samuel Carpenter
- Department of Behavioral Neuroscience, Oregon Health & Science University, USA
| | - Leeza Maron
- Department of Psychiatry, Oregon Health & Science University, USA
| | - Olaf Sporns
- Department of Psychological and Brain Sciences, Indiana University, USA
| | | | - Joel T Nigg
- Department of Psychiatry, Oregon Health & Science University, USA
| | - Damien A Fair
- Department of Behavioral Neuroscience, Oregon Health & Science University, USA.,Department of Psychiatry, Oregon Health & Science University, USA.,Advanced Imaging Research Center, Oregon Health & Science University, USA
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21
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Sitaram R, Ros T, Stoeckel L, Haller S, Scharnowski F, Lewis-Peacock J, Weiskopf N, Blefari ML, Rana M, Oblak E, Birbaumer N, Sulzer J. Closed-loop brain training: the science of neurofeedback. Nat Rev Neurosci 2016; 18:86-100. [PMID: 28003656 DOI: 10.1038/nrn.2016.164] [Citation(s) in RCA: 519] [Impact Index Per Article: 64.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
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22
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Yamamuro K, Ota T, Iida J, Nakanishi Y, Matsuura H, Uratani M, Okazaki K, Kishimoto N, Tanaka S, Kishimoto T. Event-related potentials reflect the efficacy of pharmaceutical treatments in children and adolescents with attention deficit/hyperactivity disorder. Psychiatry Res 2016; 242:288-294. [PMID: 27318633 DOI: 10.1016/j.psychres.2016.05.061] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/14/2015] [Revised: 05/31/2016] [Accepted: 05/31/2016] [Indexed: 11/19/2022]
Abstract
Few objective biological measures of pharmacological treatment efficacy exist for attention deficit/hyperactivity disorder (ADHD). Although we have previously demonstrated that event-related potentials (ERPs) reflect the effects of osmotic-release methylphenidate in treatment of naïve pediatric patients with ADHD, whether this is true for the therapeutic effects of atomoxetine (ATX) is unknown. Here, we used the Japanese version of the ADHD rating-scale IV to evaluate 14 patients with ADHD, and compared their ERP data with 14 age- and sex-matched controls. We measured P300 and mismatch negativity (MMN) components during an auditory oddball task before treatment (treatment naïve) and after 2 months of ATX treatment. Compared with controls, P300 components at baseline were attenuated and prolonged in the ADHD group at Fz (fronto-central), Cz (centro-parietal), Pz (parietal regions), C3 and C4 electrodes. ATX treatment reduced ADHD symptomology, and after 2 months of treatment, P300 latencies at Fz, Cz, Pz, C3, and C4 electrodes were significantly shorter than those at baseline. Moreover, MMN amplitudes at Cz and C3 electrodes were significantly greater than those at baseline. Thus, ERPs may be useful for evaluating the pharmacological effects of ATX in pediatric and adolescent patients with ADHD.
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Affiliation(s)
- Kazuhiko Yamamuro
- Department of Psychiatry, Nara Medical University School of Medicine, Kashihara, Japan
| | - Toyosaku Ota
- Department of Psychiatry, Nara Medical University School of Medicine, Kashihara, Japan.
| | - Junzo Iida
- Faculty of Nursing, Nara Medical University School of Medicine, Kashihara, Japan
| | - Yoko Nakanishi
- Department of Psychiatry, Nara Medical University School of Medicine, Kashihara, Japan
| | | | - Mitsuhiro Uratani
- Department of Psychiatry, Nara Prefectural General Rehabilitation Center, Shiki, Japan
| | - Kosuke Okazaki
- Department of Psychiatry, Nara Medical University School of Medicine, Kashihara, Japan
| | - Naoko Kishimoto
- Department of Psychiatry, Nara Medical University School of Medicine, Kashihara, Japan
| | - Shohei Tanaka
- Department of Psychiatry, Nara Medical University School of Medicine, Kashihara, Japan
| | - Toshifumi Kishimoto
- Department of Psychiatry, Nara Medical University School of Medicine, Kashihara, Japan
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23
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Battel L, Kieling RR, Kieling C, Anés M, Aurich NK, da Costa JC, Rohde LA, Franco AR. Intrinsic Brain Connectivity Following Long-Term Treatment with Methylphenidate in Children with Attention-Deficit/Hyperactivity Disorder. J Child Adolesc Psychopharmacol 2016; 26:555-61. [PMID: 27027427 DOI: 10.1089/cap.2015.0221] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
INTRODUCTION Although widely used for the treatment of attention-deficit/hyperactivity disorder (ADHD) across the life span, the effects of methylphenidate (MPH) on the brain are not completely understood. Functional neuroimaging techniques may help increase knowledge about the mechanisms of MPH action. OBJECTIVE To evaluate changes in functional connectivity patterns of the default mode network (DMN) in children with ADHD following long-term treatment with MPH. METHODS Twenty-three right-handed treatment-naïve boys with ADHD underwent a protocol of intrinsic functional connectivity before and after 6 months of treatment with MPH. Functional connectivity was analyzed using a region of interest (ROI) approach and independent component analysis (ICA). RESULTS ROI analyses showed no significant changes in connectivity between regions of the DMN following treatment, with a relatively small increase in the anterior-posterior connectivity of the network. ICA revealed a significant increase in connectivity between the left putamen and the DMN (p < 0.001, corrected). There was a correlation between the reduction of symptoms and the increased connectivity between the putamen and the DMN after treatment (rho = -0.65, p = 0.017). CONCLUSION Dysfunctions in cortical-subcortical circuits have often been associated with the pathophysiology of ADHD. Our findings suggest that effective treatment with MPH in children with ADHD may affect brain functioning by increasing connectivity between the DMN and subcortical nuclei.
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Affiliation(s)
- Lucas Battel
- 1 Department of Psychiatry, Hospital de Clínicas de Porto Alegre , Universidade Federal do Rio Grande do Sul, Porto Alegre, Brazil
| | - Renata R Kieling
- 1 Department of Psychiatry, Hospital de Clínicas de Porto Alegre , Universidade Federal do Rio Grande do Sul, Porto Alegre, Brazil
| | - Christian Kieling
- 1 Department of Psychiatry, Hospital de Clínicas de Porto Alegre , Universidade Federal do Rio Grande do Sul, Porto Alegre, Brazil
| | - Maurício Anés
- 1 Department of Psychiatry, Hospital de Clínicas de Porto Alegre , Universidade Federal do Rio Grande do Sul, Porto Alegre, Brazil .,2 Brain Institute (InsCer) , PUCRS, Porto Alegre, Brazil
| | - Nathassia Kadletz Aurich
- 3 National Institute of Developmental Psychiatry for Children and Adolescents , Porto Alegre, Brazil
| | | | - Luis Augusto Rohde
- 1 Department of Psychiatry, Hospital de Clínicas de Porto Alegre , Universidade Federal do Rio Grande do Sul, Porto Alegre, Brazil .,3 National Institute of Developmental Psychiatry for Children and Adolescents , Porto Alegre, Brazil
| | - Alexandre Rosa Franco
- 2 Brain Institute (InsCer) , PUCRS, Porto Alegre, Brazil .,4 School of Engineering , PUCRS, Porto Alegre, Brazil
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24
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Biskup CS, Helmbold K, Baurmann D, Klasen M, Gaber TJ, Bubenzer-Busch S, Königschulte W, Fink GR, Zepf FD. Resting state default mode network connectivity in children and adolescents with ADHD after acute tryptophan depletion. Acta Psychiatr Scand 2016; 134:161-71. [PMID: 27145324 DOI: 10.1111/acps.12573] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Accepted: 02/25/2016] [Indexed: 11/28/2022]
Abstract
OBJECTIVE Alterations of the default mode network (DMN) have been described in patients with neuropsychiatric disorders, including attention deficit hyperactivity disorder (ADHD), and the neurotransmitter serotonin (5-HT) is known to modulate DMN activity. This study aimed to explore the role of 5-HT on the DMN and its functional connectivity (FC) in young patients with ADHD. METHODS Young male patients with ADHD (n = 12) and healthy controls (n = 10) (both aged 12-17 years) were subjected to acute tryptophan depletion (ATD) and subsequently diminished brain 5-HT synthesis. Three hours after challenge intake (ATD or a balanced control condition, BAL), resting state fMRI scans were obtained. RESULTS In patients, ATD led to attenuated FC of the right superior premotor cortex (BA 6) with the DMN, comparable to the extent found in controls after BAL administration. ATD lowered FC of the left somatosensory cortex (BA 3) with the DMN, independently of the factor group, but with stronger effects in controls. CONCLUSIONS Data reveal a serotonergic modulation of FC between BA 6 and 3, known to be relevant for motor planning and sensory perception, and the DMN, thereby possibly pointing toward ATD acting beneficially on neural planning of motor activity in patients with ADHD.
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Affiliation(s)
- C S Biskup
- Department of Child and Adolescent Psychiatry, Psychosomatics and Psychotherapy, RWTH Aachen University, Aachen, Germany.,JARA Translational Brain Medicine, Aachen & Jülich, Germany.,Cognitive Neuroscience, Institute for Neuroscience and Medicine (INM3), Research Centre Jülich, Jülich, Germany
| | - K Helmbold
- Department of Child and Adolescent Psychiatry, Psychosomatics and Psychotherapy, RWTH Aachen University, Aachen, Germany.,JARA Translational Brain Medicine, Aachen & Jülich, Germany
| | - D Baurmann
- Department of Child and Adolescent Psychiatry, Psychosomatics and Psychotherapy, RWTH Aachen University, Aachen, Germany.,JARA Translational Brain Medicine, Aachen & Jülich, Germany.,Cognitive Neuroscience, Institute for Neuroscience and Medicine (INM3), Research Centre Jülich, Jülich, Germany
| | - M Klasen
- Department of Psychiatry, Psychosomatics and Psychotherapy, RWTH Aachen University, Aachen, Germany
| | - T J Gaber
- Department of Child and Adolescent Psychiatry, Psychosomatics and Psychotherapy, RWTH Aachen University, Aachen, Germany.,JARA Translational Brain Medicine, Aachen & Jülich, Germany
| | - S Bubenzer-Busch
- Department of Child and Adolescent Psychiatry, Psychosomatics and Psychotherapy, RWTH Aachen University, Aachen, Germany.,JARA Translational Brain Medicine, Aachen & Jülich, Germany.,Cognitive Neuroscience, Institute for Neuroscience and Medicine (INM3), Research Centre Jülich, Jülich, Germany
| | - W Königschulte
- Department of Child and Adolescent Psychiatry, Psychosomatics and Psychotherapy, RWTH Aachen University, Aachen, Germany.,JARA Translational Brain Medicine, Aachen & Jülich, Germany.,Cognitive Neuroscience, Institute for Neuroscience and Medicine (INM3), Research Centre Jülich, Jülich, Germany
| | - G R Fink
- Cognitive Neuroscience, Institute for Neuroscience and Medicine (INM3), Research Centre Jülich, Jülich, Germany.,Department of Neurology, University of Cologne, Cologne, Germany
| | - F D Zepf
- Department of Child and Adolescent Psychiatry, Psychosomatics and Psychotherapy, RWTH Aachen University, Aachen, Germany.,JARA Translational Brain Medicine, Aachen & Jülich, Germany.,Cognitive Neuroscience, Institute for Neuroscience and Medicine (INM3), Research Centre Jülich, Jülich, Germany.,Centre & Discipline of Child and Adolescent Psychiatry, Psychosomatics and Psychotherapy; School of Psychiatry and Clinical Neurosciences & School of Paediatrics and Child Health, Faculty of Medicine, Dentistry and Health Sciences, The University of Western Australia, Perth, WA, Australia.,Specialised Child and Adolescent Mental Health Services (CAMHS), Department of Health in Western Australia, Perth, WA, Australia
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25
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Kessler D, Angstadt M, Sripada C. Growth Charting of Brain Connectivity Networks and the Identification of Attention Impairment in Youth. JAMA Psychiatry 2016; 73:481-9. [PMID: 27076193 PMCID: PMC5507181 DOI: 10.1001/jamapsychiatry.2016.0088] [Citation(s) in RCA: 77] [Impact Index Per Article: 9.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/14/2022]
Abstract
IMPORTANCE Intrinsic connectivity networks (ICNs), important units of brain functional organization, demonstrate substantial maturation during youth. In addition, interrelationships between ICNs have been reliably implicated in attention performance. It is unknown whether alterations in ICN maturational profiles can reliably detect impaired attention functioning in youth. OBJECTIVE To use a network growth charting approach to investigate the association between alterations in ICN maturation and attention performance. DESIGN, SETTING, AND PARTICIPANTS Data were obtained from the publicly available Philadelphia Neurodevelopmental Cohort, a prospective, population-based sample of 9498 youths who underwent genomic testing, neurocognitive assessment, and neuroimaging. Data collection was conducted at an academic and children's hospital health care network between November 1, 2009, and November 30, 2011, and data analysis was conducted between February 1, 2015, and January 15, 2016. MAIN OUTCOMES AND MEASURES Statistical associations between deviations from normative network growth were assessed as well as 2 main outcome measures: accuracy during the Penn Continuous Performance Test and diagnosis with attention-deficit/hyperactivity disorder. RESULTS Of the 9498 individuals identified, 1000 youths aged 8 to 22 years underwent brain imaging. A sample of 519 youths who met quality control criteria entered analysis, of whom 25 (4.8%) met criteria for attention-deficit/hyperactivity disorder. The mean (SD) age of the youth was 15.7 (3.1) years, and 223 (43.0%) were male. Participants' patterns of deviations from normative maturational trajectories were indicative of sustained attention functioning (R2 = 24%; F6,512 = 26.89; P < 2.2 × 10-16). Moreover, these patterns were found to be a reliable biomarker of severe attention impairment (peak receiver operating characteristic curve measured by area under the curve, 79.3%). In particular, a down-shifted pattern of ICN maturation (shallow maturation), rather than a right-shifted pattern (lagged maturation), was implicated in reduced attention performance (Akaike information criterion relative likelihood, 3.22 × 1026). Finally, parallel associations between ICN dysmaturation and diagnosis of attention-deficit/hyperactivity disorder were identified. CONCLUSIONS AND RELEVANCE Growth charting methods are widely used to assess the development of physical or other biometric characteristics, such as weight and head circumference. To date, this is the first demonstration that this method can be extended to development of functional brain networks to identify clinically relevant conditions, such as dysfunction of sustained attention.
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Affiliation(s)
- Daniel Kessler
- Department of Psychiatry, University of Michigan, Ann Arbor
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26
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Fall S, Querne L, Le Moing AG, Berquin P. Individual differences in subcortical microstructure organization reflect reaction time performances during a flanker task: a diffusion tensor imaging study in children with and without ADHD. Psychiatry Res 2015; 233:50-6. [PMID: 26025013 DOI: 10.1016/j.pscychresns.2015.05.001] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/19/2014] [Revised: 03/30/2015] [Accepted: 05/01/2015] [Indexed: 11/25/2022]
Abstract
The results of several previous magnetic resonance imaging studies suggest that the fronto-striato-thalamic circuitry is involved in the pathophysiology of attention-deficit/hyperactivity disorder (ADHD). However, few studies have investigated the putative association between quantitative diffusion tensor imaging measurements of subcortical gray matter and subject task performances in children with ADHD. Here, we examined whether reaction time (RT) parameters during a flanker task were correlated with mean diffusivity (MD) measurements in the basal ganglia and thalamus in children with ADHD and in controls. For the study group as a whole, both the mean RT and the intra-individual variability in RTs were found to be significantly correlated with MD measurements in the right and left caudate, putamen and thalamus. In contrast, the correlation between the interference effect and MD failed to reach statistical significance. The present results may advance our understanding of the anatomical substrates of ADHD.
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Affiliation(s)
- Sidy Fall
- Department of Pediatric Neurology. INSERM U-1105, Amiens University Medical Center, F-80054, France.
| | - Laurent Querne
- Department of Pediatric Neurology. INSERM U-1105, Amiens University Medical Center, F-80054, France
| | - Anne-Gaëlle Le Moing
- Department of Pediatric Neurology. INSERM U-1105, Amiens University Medical Center, F-80054, France
| | - Patrick Berquin
- Department of Pediatric Neurology. INSERM U-1105, Amiens University Medical Center, F-80054, France
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27
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Abstract
Resting state functional magnetic imaging (fMRI) is a novel means to examine functional brain networks. It allows investigators to identify functional networks defined by distinct, spontaneous signal fluctuations. Resting state functional connectivity (RSFC) studies examining child and adolescent psychiatric disorders are being published with increasing frequency, despite concerns about the impact of motion on findings. Here we review important RSFC findings on typical brain development and recent publications of child and adolescent psychiatric disorders. We close with a summary of the major findings and current strengths and limitations of RSFC studies.
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