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Rosenberg MD, Hsu WT, Scheinost D, Todd Constable R, Chun MM. Connectome-based Models Predict Separable Components of Attention in Novel Individuals. J Cogn Neurosci 2017; 30:160-173. [PMID: 29040013 DOI: 10.1162/jocn_a_01197] [Citation(s) in RCA: 60] [Impact Index Per Article: 8.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
Although we typically talk about attention as a single process, it comprises multiple independent components. But what are these components, and how are they represented in the functional organization of the brain? To investigate whether long-studied components of attention are reflected in the brain's intrinsic functional organization, here we apply connectome-based predictive modeling (CPM) to predict the components of Posner and Petersen's influential model of attention: alerting (preparing and maintaining alertness and vigilance), orienting (directing attention to a stimulus), and executive control (detecting and resolving cognitive conflict) [Posner, M. I., & Petersen, S. E. The attention system of the human brain. Annual Review of Neuroscience, 13, 25-42, 1990]. Participants performed the Attention Network Task (ANT), which measures these three factors, and rested during fMRI scanning. CPMs tested with leave-one-subject-out cross-validation successfully predicted novel individual's overall ANT accuracy, RT variability, and executive control scores from functional connectivity observed during ANT performance. CPMs also generalized to predict participants' alerting scores from their resting-state functional connectivity alone, demonstrating that connectivity patterns observed in the absence of an explicit task contain a signature of the ability to prepare for an upcoming stimulus. Suggesting that significant variance in ANT performance is also explained by an overall sustained attention factor, the sustained attention CPM, a model defined in prior work to predict sustained attentional abilities, predicted accuracy, RT variability, and executive control from task-based data and predicted RT variability from resting-state data. Our results suggest that, whereas executive control may be closely related to sustained attention, the infrastructure that supports alerting is distinct and can be measured at rest. In the future, CPM may be applied to elucidate additional independent components of attention and relationships between the functional brain networks that predict them.
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102
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Gazzellini S, Napolitano A, Bauleo G, Bisozzi E, Lispi ML, Ardu E, Castelli E, Benso F. Time-frequency analyses of reaction times and theta/beta EEG ratio in pediatric patients with traumatic brain injury: A preliminary study. Dev Neurorehabil 2017; 20:393-407. [PMID: 27629793 DOI: 10.1080/17518423.2016.1216470] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
Abstract
PURPOSE The literature on patients with attention deficit reports peculiar reaction time (RT) oscillation at very low frequencies (VLFO=0.06-0.2 Hz). The data were explained as default mode network (DMN) intrusion in goal-oriented activity. The present study investigates whether a pattern of recurrent lapses in attention can be detected in TBI patients and whether VLFO can be generalized to the sustained attention deficit, regardless of etiology. METHODS Groups of pediatric TBIs and healthy controls performed four attentional tasks. RT and theta/beta timeseries were subjected to wavelet analyses. RESULTS Significant high-power VLFOs were recorded in patient group performances but not in those of controls, both for RTs and theta/beta in all the tasks. CONCLUSION This preliminary study suggests that central-midline theta/beta ratio could be considered a neurophysiological correlate of RT variability and that the general continuous goal-oriented activity can be cross-etiologically affected by recurrent lapses in attention regardless of the specific cognitive component involved.
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Affiliation(s)
- Simone Gazzellini
- a Department of Neuroscience and Neurorehabilitation, Bambino Gesù Children's Hospital IRCCS , Rome , Italy
| | - Antonio Napolitano
- b Clinical Technology Innovations Research Area, Bambino Gesù Children's Hospital IRCCS , Rome , Italy
| | - Graziella Bauleo
- c "Il filo dalla Torre" Centre for Education, Autism and Disability , Rome , Italy
| | - Eleonora Bisozzi
- a Department of Neuroscience and Neurorehabilitation, Bambino Gesù Children's Hospital IRCCS , Rome , Italy
| | - Maria Luisa Lispi
- a Department of Neuroscience and Neurorehabilitation, Bambino Gesù Children's Hospital IRCCS , Rome , Italy
| | | | - Enrico Castelli
- a Department of Neuroscience and Neurorehabilitation, Bambino Gesù Children's Hospital IRCCS , Rome , Italy
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Liu ZZ, Qu HJ, Tian ZL, Han MJ, Fan Y, Ge LZ, Zang YF, Zhang H. Reproducibility of frequency-dependent low frequency fluctuations in reaction time over time and across tasks. PLoS One 2017; 12:e0184476. [PMID: 28910331 PMCID: PMC5598978 DOI: 10.1371/journal.pone.0184476] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/14/2016] [Accepted: 08/21/2017] [Indexed: 11/19/2022] Open
Abstract
Objective Increased levels of reaction time variability (RTV) are characteristics of sustained attention deficits. The clinical significance of RTV has been widely recognized. However, the reliability of RTV measurements has not been widely studied. The present study aimed to assess the test-retest reliability of RTV conventional measurements, e.g., the standard deviation (SD), the coefficient of variation (CV), and a new measurement called the amplitude of low frequency fluctuation (ALFF) of RT. In addition, we aimed to assess differences and similarities of these measurements between different tasks. Method Thirty-seven healthy college students participated in 2 tasks, i.e., an Eriksen flanker task (EFT) and a simple reaction task (SRT), twice over a mean interval of 56 days. Conventional measurements of RTV including RT-SD and RT-CV were assessed first. Then the RT time series were converted into frequency domains, and RT-ALFF was further calculated for the whole frequency band (0.0023–0.167 Hz) and for a few sub-frequency bands including Slow-6 (<0.01 Hz), Slow-5 (0.01–0.027 Hz), Slow-4 (0.027–0.073 Hz), and Slow-3 (0.073–0.167 Hz). The test-retest reliability of these measurements was evaluated through intra-class correlation (ICC) tests. Differences and correlations between each EFT and SRT measurement were further examined during both visits. Results 1) The RT-ALFF of the Slow-5/4/3 and conventional measurements of RT-SD and RT-CV showed moderate to high levels of test-retest reliability. EFT RT-ALFF patterns generated slightly higher ICC values than SRT values in higher frequency bands (Slow-3), but SRT RT-ALFF values showed slightly higher ICC values than EFT values in lower frequency bands (Slow-5 and Slow-4). 2) RT-ALFF magnitudes in each sub-frequency band were greater for the SRT than those for the EFT. 3) The RT-ALFF in the Slow-4 of the EFT was found to be correlated with the RT-ALFF in the Slow-5 of the SRT for both two visits, but no consistently significant correlation was found between the same frequency bands. Conclusions These findings reveal good test-retest reliability for conventional measurements and for the RT-ALFF of RTV. The RT-ALFF presented frequency-dependent similarities across tasks. All of our results reveal the presence of different frequency structures between the two tasks, and thus the frequency-dependent characteristics of different tasks deserve more attention in future studies.
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Affiliation(s)
- Zan-Zan Liu
- Department of Psychology, Zhejiang Sci-Tech University, Hangzhou, China
| | - Hui-Jie Qu
- Department of Psychology, Zhejiang Sci-Tech University, Hangzhou, China
| | - Zhuo-Ling Tian
- Institutes of Psychological Sciences, Hangzhou Normal University, Hangzhou, China
- Zhejiang Key Laboratory for Research in Assessment of Cognitive Impairments, Hangzhou, China
- Center for Cognition and Brain Disorders, Hangzhou Normal University, Hangzhou, China
| | - Meng-Jian Han
- Department of Physics, Zhejiang Sci-Tech University, Hangzhou, China
| | - Yi Fan
- Institutes of Psychological Sciences, Hangzhou Normal University, Hangzhou, China
- Zhejiang Key Laboratory for Research in Assessment of Cognitive Impairments, Hangzhou, China
- Center for Cognition and Brain Disorders, Hangzhou Normal University, Hangzhou, China
| | - Lie-Zhong Ge
- Department of Psychology, Zhejiang Sci-Tech University, Hangzhou, China
| | - Yu-Feng Zang
- Institutes of Psychological Sciences, Hangzhou Normal University, Hangzhou, China
- Zhejiang Key Laboratory for Research in Assessment of Cognitive Impairments, Hangzhou, China
- Center for Cognition and Brain Disorders, Hangzhou Normal University, Hangzhou, China
- * E-mail: (YFZ); (HZ)
| | - Hang Zhang
- Paul C. Lauterbur Research Centers for Biomedical Imaging, Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences, Shenzhen, China
- * E-mail: (YFZ); (HZ)
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Kim H, Kim JI, Kim H, Kim JW, Kim BN. Interaction effects of GIT1 and DRD4 gene variants on continuous performance test variables in patients with ADHD. Brain Behav 2017; 7:e00785. [PMID: 28948080 PMCID: PMC5607549 DOI: 10.1002/brb3.785] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/13/2016] [Revised: 05/18/2017] [Accepted: 06/26/2017] [Indexed: 11/28/2022] Open
Abstract
INTRODUCTION The G protein-coupled receptor kinase interacting protein 1 gene (GIT1) has been proposed to be a risk gene for attention deficit hyperactivity disorder (ADHD), and it regulates the endocytosis of G protein-coupled receptors like dopamine receptors. The purpose of this study was to investigate the interaction effects of GIT1 and dopamine receptor D4 (DRD4) gene variants on variables of the continuous performance test (CPT). METHODS This study recruited 255 ADHD patients and 98 healthy controls (HC) who underwent CPT and genetic analyses. The genotypes were classified into two groups (the C/C and C/T genotype groups for GIT1, 4R homozygotes and others for DRD4) and the genotype × genotype effects were examined using hierarchical multivariable linear regression analyses. RESULTS There were significant GIT1 × DRD4 effects for commission errors on the CPT in the ADHD group (p = .006). In contrast, there were no significant GIT1 × DRD4 effects on any CPT variables in the HC. CONCLUSIONS The present findings demonstrated that there were significant interaction effects of the GIT1 and DRD4 gene variants on impulsivity in ADHD. Replication studies with larger sample sizes that include patients from various ethnic backgrounds are warranted to confirm these findings.
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Affiliation(s)
- Hyojin Kim
- Division of Child and Adolescent Psychiatry Department of Psychiatry Seoul National University College of Medicine Seoul Republic of Korea
| | - Johanna Inhyang Kim
- Department of Public Health Medical Services Seoul National University Bundang Hospital Seong-nam Gyeonggi-do Republic of Korea
| | - Haebin Kim
- Division of Child and Adolescent Psychiatry Department of Psychiatry Seoul National University College of Medicine Seoul Republic of Korea
| | - Jae-Won Kim
- Division of Child and Adolescent Psychiatry Department of Psychiatry Seoul National University College of Medicine Seoul Republic of Korea
| | - Bung-Nyun Kim
- Division of Child and Adolescent Psychiatry Department of Psychiatry Seoul National University College of Medicine Seoul Republic of Korea
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105
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Kyeong S, Kim JJ, Kim E. Novel subgroups of attention-deficit/hyperactivity disorder identified by topological data analysis and their functional network modular organizations. PLoS One 2017; 12:e0182603. [PMID: 28829775 PMCID: PMC5567504 DOI: 10.1371/journal.pone.0182603] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/22/2017] [Accepted: 07/23/2017] [Indexed: 11/18/2022] Open
Abstract
Attention-deficit/hyperactivity disorder (ADHD) is a clinically heterogeneous condition and identification of clinically meaningful subgroups would open up a new window for personalized medicine. Thus, we aimed to identify new clinical phenotypes in children and adolescents with ADHD and to investigate whether neuroimaging findings validate the identified phenotypes. Neuroimaging and clinical data from 67 children with ADHD and 62 typically developing controls (TDCs) from the ADHD-200 database were selected. Clinical measures of ADHD symptoms and intelligence quotient (IQ) were used as input features into a topological data analysis (TDA) to identify ADHD subgroups within our sample. As external validators, graph theoretical measures obtained from the functional connectome were compared to address the biological meaningfulness of the identified subtypes. The TDA identified two unique subgroups of ADHD, labelled as mild symptom ADHD (mADHD) and severe symptom ADHD (sADHD). The output topology shape was repeatedly observed in the independent validation dataset. The graph theoretical analysis showed a decrease in the degree centrality and PageRank in the bilateral posterior cingulate cortex in the sADHD group compared with the TDC group. The mADHD group showed similar patterns of intra- and inter-module connectivity to the sADHD group. Relative to the TDC group, the inter-module connectivity between the default mode network and executive control network were significantly increased in the sADHD group but not in the mADHD group. Taken together, our results show that the data-driven TDA is potentially useful in identifying objective and biologically relevant disease phenotypes in children and adolescents with ADHD.
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Affiliation(s)
- Sunghyon Kyeong
- Severance Biomedical Science Institute, Yonsei University College of Medicine, Seoul, Republic of Korea
| | - Jae-Jin Kim
- Severance Biomedical Science Institute, Yonsei University College of Medicine, Seoul, Republic of Korea
- Department of Psychiatry and Institute of Behavioral Science in Medicine, Yonsei University College of Medicine, Seoul, Republic of Korea
| | - Eunjoo Kim
- Department of Psychiatry and Institute of Behavioral Science in Medicine, Yonsei University College of Medicine, Seoul, Republic of Korea
- * E-mail:
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106
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Sustained attention to a predictable, unengaging Go/No-Go task shows ongoing development between 6 and 11 years. Atten Percept Psychophys 2017; 79:1726-1741. [DOI: 10.3758/s13414-017-1351-4] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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107
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Neural dynamics underlying varying attentional control facing invariant cognitive task upon invariant stimuli. Neuroscience 2017; 353:133-146. [DOI: 10.1016/j.neuroscience.2017.04.023] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2016] [Revised: 03/28/2017] [Accepted: 04/18/2017] [Indexed: 11/22/2022]
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108
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Salari R, Bohlin G, Rydell AM, Thorell LB. Neuropsychological Functioning and Attachment Representations in Early School Age as Predictors of ADHD Symptoms in Late Adolescence. Child Psychiatry Hum Dev 2017; 48:370-384. [PMID: 27349655 DOI: 10.1007/s10578-016-0664-1] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
This study aimed to examine relations between parent and child attachment representations and neuropsychological functions at age 8, as well as relations between these constructs and ADHD symptoms over a 10-year period. A community-based sample of 105 children (52 boys) participated. Measures of attachment representations and a range of neuropsychological functions were collected at age 8. Parents rated emotion dysregulation and ADHD symptoms at age 8 and ADHD symptoms again at age 18. Significant, although modest, relations were found between disorganized attachment and some aspects of neuropsychological functioning in childhood. When studying outcomes in late adolescence and controlling for early ADHD symptom levels, spatial working memory and disorganized attachment remained significant in relation to both ADHD symptom domains, and one measure of inhibition remained significant for hyperactivity/impulsivity. When examining independent effects, spatial working memory and disorganized attachment were related to inattention, whereas spatial working memory and dysregulation of happiness/exuberance were related to hyperactivity/impulsivity. Our findings showing that disorganized attachment is longitudinally related to ADHD symptoms over and above the influence of both neuropsychological functioning and early ADHD symptom levels highlights the importance of including measures of attachment representations when trying to understand the development of ADHD symptoms. If replicated in more "at-risk" samples, these findings could also suggest that parent-child attachment should be taken into consideration when children are referred for assessment and treatment of ADHD.
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Affiliation(s)
- Raziye Salari
- Division of Psychology, Department of Clinical Neuroscience and Stockholm Brain Institute, Karolinska Institutet, Nobels Väg 9, 171 65, Stockholm, Sweden
- Department of Women's and Children's Health, Uppsala University, Uppsala, Sweden
| | - Gunilla Bohlin
- Department of Psychology, Uppsala University, Uppsala, Sweden
| | | | - Lisa B Thorell
- Division of Psychology, Department of Clinical Neuroscience and Stockholm Brain Institute, Karolinska Institutet, Nobels Väg 9, 171 65, Stockholm, Sweden.
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109
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Lewis FC, Reeve RA, Kelly SP, Johnson KA. Evidence of substantial development of inhibitory control and sustained attention between 6 and 8years of age on an unpredictable Go/No-Go task. J Exp Child Psychol 2017; 157:66-80. [DOI: 10.1016/j.jecp.2016.12.008] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/11/2016] [Revised: 12/19/2016] [Accepted: 12/20/2016] [Indexed: 11/25/2022]
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110
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Cheung CHM, McLoughlin G, Brandeis D, Banaschewski T, Asherson P, Kuntsi J. Neurophysiological Correlates of Attentional Fluctuation in Attention-Deficit/Hyperactivity Disorder. Brain Topogr 2017; 30:320-332. [PMID: 28289850 PMCID: PMC5408051 DOI: 10.1007/s10548-017-0554-2] [Citation(s) in RCA: 33] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/30/2016] [Accepted: 02/01/2017] [Indexed: 11/25/2022]
Abstract
Cognitive performance in attention-deficit/hyperactivity disorder (ADHD) is characterised, in part, by frequent fluctuations in response speed, resulting in high reaction time variability (RTV). RTV captures a large proportion of the genetic risk in ADHD but, importantly, is malleable, improving significantly in a fast-paced, rewarded task condition. Using the temporal precision offered by event-related potentials (ERPs), we aimed to examine the neurophysiological measures of attention allocation (P3 amplitudes) and preparation (contingent negative variation, CNV), and their associations with the fluctuating RT performance and its improvement in ADHD. 93 participants with ADHD and 174 controls completed the baseline and fast-incentive conditions of a four-choice reaction time task, while EEG was simultaneously recorded. Compared to controls, individuals with ADHD showed both increased RTV and reduced P3 amplitudes during performance on the RT task. In the participants with ADHD, attenuated P3 amplitudes were significantly associated with high RTV, and the increase in P3 amplitudes from a slow baseline to a fast-paced, rewarded condition was significantly associated with the RTV decrease. Yet, the individuals with ADHD did not show the same increase in CNV from baseline to fast-incentive condition as observed in controls. ADHD is associated both with a neurophysiological impairment of attention allocation (P3 amplitudes) and an inability to adjust the preparatory state (CNV) in a changed context. Our findings suggest that both neurophysiological and cognitive performance measures of attention are malleable in ADHD, which are potential targets for non-pharmacological interventions.
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Affiliation(s)
- Celeste H M Cheung
- MRC Social, Genetic and Developmental Psychiatry Centre, Institute of Psychiatry, Psychology and Neuroscience, King's College London, London, UK
| | - Gráinne McLoughlin
- MRC Social, Genetic and Developmental Psychiatry Centre, Institute of Psychiatry, Psychology and Neuroscience, King's College London, London, UK
| | - Daniel Brandeis
- Department of Child and Adolescent Psychiatry and Psychotherapy, Central Institute of Mental Health, Medical Faculty Mannheim, Heidelberg University, Mannheim, Germany.,Department of Child and Adolescent Psychiatry, University of Zurich, Zurich, Switzerland.,Center for Integrative Human Physiology, University of Zurich, Zurich, Switzerland.,Neuroscience Center Zurich, University of Zurich, Zurich, Switzerland
| | - Tobias Banaschewski
- Department of Child and Adolescent Psychiatry and Psychotherapy, Central Institute of Mental Health, Medical Faculty Mannheim, Heidelberg University, Mannheim, Germany
| | - Philip Asherson
- MRC Social, Genetic and Developmental Psychiatry Centre, Institute of Psychiatry, Psychology and Neuroscience, King's College London, London, UK
| | - Jonna Kuntsi
- MRC Social, Genetic and Developmental Psychiatry Centre, Institute of Psychiatry, Psychology and Neuroscience, King's College London, London, UK.
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111
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Kim JI, Yoo JH, Kim D, Jeong B, Kim BN. The effects of GRIN2B and DRD4 gene variants on local functional connectivity in attention-deficit/hyperactivity disorder. Brain Imaging Behav 2017; 12:247-257. [DOI: 10.1007/s11682-017-9690-2] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
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112
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Weigard A, Huang-Pollock C. The role of speed in ADHD-related working memory deficits: A time-based resource-sharing and diffusion model account. Clin Psychol Sci 2017; 5:195-211. [PMID: 28533945 PMCID: PMC5437983 DOI: 10.1177/2167702616668320] [Citation(s) in RCA: 48] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Several recent commentaries suggest that, for psychological science to move beyond "homuncular" explanations for cognitive control, it is critically important to examine the role of basic and computationally well-defined processes (e.g. cognitive processing speed). Correlational evidence has previously linked slow speed to working memory (WM) deficits in ADHD, but the directionality of this relationship has not been investigated experimentally and the mechanisms through which speed may influence WM are unclear. Herein, we demonstrate in school-aged children with and without ADHD, that manipulating speed (indexed with the diffusion model) within a WM paradigm reduces WM capacity due to an increase in cognitive load, in a manner that is consistent with predictions of the time-based resource-sharing model of WM. Results suggest slow speed is a plausible cause of WM deficits in ADHD, provide a mechanistic account of this relationship, and urge the exploration of non-executive neurocognitive processes in clinical research on etiology.
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113
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Sotnikova A, Soff C, Tagliazucchi E, Becker K, Siniatchkin M. Transcranial Direct Current Stimulation Modulates Neuronal Networks in Attention Deficit Hyperactivity Disorder. Brain Topogr 2017; 30:656-672. [DOI: 10.1007/s10548-017-0552-4] [Citation(s) in RCA: 50] [Impact Index Per Article: 7.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/26/2015] [Accepted: 01/27/2017] [Indexed: 12/19/2022]
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114
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Remmelink E, Chau U, Smit AB, Verhage M, Loos M. A one-week 5-choice serial reaction time task to measure impulsivity and attention in adult and adolescent mice. Sci Rep 2017; 7:42519. [PMID: 28198416 PMCID: PMC5309744 DOI: 10.1038/srep42519] [Citation(s) in RCA: 30] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/26/2016] [Accepted: 01/11/2017] [Indexed: 11/19/2022] Open
Abstract
Many psychiatric disorders emerge during adolescence. The study of executive functions in animal models of these disorders critically requires short-duration tasks measuring these functions before the animal ages. Here, a novel 5-choice serial reaction time task (5-CSRTT) protocol is presented, to measure attention and impulsivity within one week, without scheduled food deprivation and with little animal handling. Mice were allowed 24-h/day task access from their home-cage, during which they could self-pace task progression and earn unlimited food rewards depending on task performance. Manipulation of task parameters in this self-paced 5-CSRTT protocol (SP-5C) affected attentional performance and impulsivity to a similar extent as previously observed in the 5-CSRTT. Task activity followed intrinsic circadian rhythm, distinctive for the SP-5C protocol, with task performance stable over the day. The sensitivity of the SP-5C protocol to detect strain differences between C57BL/6J, DBA/2 J, BXD16 and BXD62 mice was demonstrated as well as its suitability for testing adolescent mice. Acute administration of the muscarinic acetylcholine receptor antagonist scopolamine impaired attentional performance, providing initial pharmacological validation of the task. The SP-5C substantially shortens the assessment of impulsivity and attention, increases test efficiency and enables the assessment of adolescent mouse models of psychiatric disorders.
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Affiliation(s)
- Esther Remmelink
- Sylics (Synaptologics B.V.), 1008 BA Amsterdam, The Netherlands
- Department of Molecular and Cellular Neurobiology, Center for Neurogenomics and Cognitive Research, Neuroscience Campus Amsterdam, VU University, 1081 HV Amsterdam, The Netherlands
- Department of Functional Genomics, Center for Neurogenomics and Cognitive Research, Neuroscience Campus Amsterdam, VU University, 1081 HV Amsterdam, The Netherlands
| | - Uyen Chau
- Sylics (Synaptologics B.V.), 1008 BA Amsterdam, The Netherlands
| | - August B. Smit
- Department of Molecular and Cellular Neurobiology, Center for Neurogenomics and Cognitive Research, Neuroscience Campus Amsterdam, VU University, 1081 HV Amsterdam, The Netherlands
| | - Matthijs Verhage
- Department of Functional Genomics, Center for Neurogenomics and Cognitive Research, Neuroscience Campus Amsterdam, VU University, 1081 HV Amsterdam, The Netherlands
| | - Maarten Loos
- Sylics (Synaptologics B.V.), 1008 BA Amsterdam, The Netherlands
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115
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Tucha L, Fuermaier ABM, Koerts J, Buggenthin R, Aschenbrenner S, Weisbrod M, Thome J, Lange KW, Tucha O. Sustained attention in adult ADHD: time-on-task effects of various measures of attention. J Neural Transm (Vienna) 2017; 124:39-53. [PMID: 26206605 PMCID: PMC5281679 DOI: 10.1007/s00702-015-1426-0] [Citation(s) in RCA: 40] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/14/2015] [Accepted: 07/11/2015] [Indexed: 11/28/2022]
Abstract
Neuropsychological research on adults with ADHD showed deficits in various aspects of attention. However, the majority of studies failed to explore the change of performance over time, so-called time-on-task effects. As a consequence, little is known about sustained attention performance of adults with ADHD. The aim of the present study was therefore to test the hypothesis of sustained attention deficits of adults with ADHD. Twenty-nine adults with ADHD and 30 healthy individuals were assessed on four 20-min tests of sustained attention, measuring alertness, selective attention, divided attention and flexibility. The deterioration of performance over time (time-on-task effects) was compared between patients with ADHD and healthy individuals to conclude on sustained attention performance. Compared to healthy individuals, patients with ADHD showed significant deficits of medium size in selective attention and divided attention. Furthermore, medium sustained attention deficits was observed in measures of alertness, selective attention and divided attention. This study supports the notion of sustained attention deficits of adults with ADHD.
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Affiliation(s)
- Lara Tucha
- Department of Clinical and Developmental Neuropsychology, University of Groningen, Grote Kruisstraat 2/1, 9712 TS, Groningen, The Netherlands
| | - Anselm B M Fuermaier
- Department of Clinical and Developmental Neuropsychology, University of Groningen, Grote Kruisstraat 2/1, 9712 TS, Groningen, The Netherlands.
| | - Janneke Koerts
- Department of Clinical and Developmental Neuropsychology, University of Groningen, Grote Kruisstraat 2/1, 9712 TS, Groningen, The Netherlands
| | - Rieka Buggenthin
- Department of Clinical and Developmental Neuropsychology, University of Groningen, Grote Kruisstraat 2/1, 9712 TS, Groningen, The Netherlands
| | - Steffen Aschenbrenner
- Department of Clinical Psychology and Neuropsychology, SRH Clinic Karlsbad-Langensteinbach, Karlsbad-Langensteinbach, Germany
| | - Matthias Weisbrod
- Department of Psychiatry and Psychotherapy, SRH Clinic Karlsbad-Langensteinbach, Karlsbad-Langensteinbach, Germany
- Section for Experimental Psychopathology, Centre for Psychosocial Medicine, University of Heidelberg, Heidelberg, Germany
| | - Johannes Thome
- Department of Psychiatry and Psychotherapy, University of Rostock, Rostock, Germany
| | - Klaus W Lange
- Department of Experimental Psychology, University of Regensburg, Regensburg, Germany
| | - Oliver Tucha
- Department of Clinical and Developmental Neuropsychology, University of Groningen, Grote Kruisstraat 2/1, 9712 TS, Groningen, The Netherlands
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116
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Holst Y, Thorell LB. Neuropsychological Functioning in Adults With ADHD and Adults With Other Psychiatric Disorders. J Atten Disord 2017; 21:137-148. [PMID: 24134875 DOI: 10.1177/1087054713506264] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
OBJECTIVE The aim was to investigate how well neuropsychological measures can discriminate between adults with ADHD and those with other psychiatric disorders. METHOD Adults with ADHD and a clinical control group ( n = 110) were included. Neuropsychological functioning was investigated using measures of inhibition, working memory, set shifting, planning, fluency, reaction-time variability, and delay aversion. RESULTS Adults with ADHD performed more poorly compared with clinical controls with regard to all constructs. The effects of verbal memory, inhibition, set shifting, fluency, and delay aversion remained significant when controlling for IQ. However, when controlling for basic cognitive functions, only the effects of inhibition, fluency, and delay aversion were significant. Sensitivity ranged between 64% and 75%, and specificity between 66% and 81%. CONCLUSION Neuropsychological tests have a relatively poor ability to discriminate between adults with ADHD and clinical controls, but they may be used to identify individuals at particularly high risk for poor daily functioning.
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Affiliation(s)
- Ylva Holst
- 1 Karolinska Institutet, Stockholm, Sweden.,2 Stockholm County Council, Sweden
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117
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Gazzellini S, Dettori M, Amadori F, Paoli B, Napolitano A, Mancini F, Ottaviani C. Association between Attention and Heart Rate Fluctuations in Pathological Worriers. Front Hum Neurosci 2016; 10:648. [PMID: 28082881 PMCID: PMC5187380 DOI: 10.3389/fnhum.2016.00648] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/12/2016] [Accepted: 12/08/2016] [Indexed: 11/13/2022] Open
Abstract
Recent data suggests that several psychopathological conditions are associated with alterations in the variability of behavioral and physiological responses. Pathological worry, defined as the cognitive representation of a potential threat, has been associated with reduced variability of heart beat oscillations (i.e., decreased heart rate variability; HRV) and lapses of attention indexed by reaction times (RTs). Clinical populations with attention deficit show RTs oscillation around 0.05 and 0.01 Hz when performing a sustained attention task. We tested the hypothesis that people who are prone to worry do it in a predictable oscillating pattern revealed through recurrent lapses in attention and concomitant oscillating HRV. Sixty healthy young adults (50% women) were recruited: 30 exceeded the clinical cut-off on the Penn State Worry Questionnaire (PSWQ; High-Worry, HW); the remaining 30 constituted the Low-Worry (LW) group. After a diagnostic assessment, participants performed two 15-min sustained attention tasks, interspersed by a standardized worry-induction procedure. RTs, HRV and moods were assessed. The analyses of the frequency spectrum showed that the HW group presents a significant higher and constant peak of RTs oscillation around 0.01 Hz (period 100 s) after the induction of worry, in comparison with their baseline and with the LW group that was not responsive to the induction procedure. Physiologically, the induction significantly reduced high-frequency HRV and such reduction was associated with levels of self-reported worry. Results are coherent with the oscillatory nature of the default mode network (DMN) and further confirm an association between cognitive rigidity and autonomic nervous system inflexibility.
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Affiliation(s)
| | | | | | | | | | | | - Cristina Ottaviani
- IRCCS Santa Lucia FoundationRome, Italy; Department of Psychology, Sapienza University of RomeRome, Italy
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Fasmer OB, Johansen EB. Patterns of motor activity in spontaneously hypertensive rats compared to Wistar Kyoto rats. Behav Brain Funct 2016; 12:32. [PMID: 27906019 PMCID: PMC5131462 DOI: 10.1186/s12993-016-0117-9] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/11/2016] [Accepted: 11/22/2016] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND Increased motor activity is a defining characteristic of patients with ADHD, and spontaneously hypertensive rats have been suggested to be an animal model of this disorder. In the present study, we wanted to use linear and non-linear methods to explore differences in motor activity patterns in SHR/NCrl rats compared to Wistar Kyoto (WKY/NHsd) rats. METHODS A total number of 42 rats (23 SHR/NCrl and 19 WKY/NHsd, male and female) were tested. At PND 51, the animals' movements were video-recorded during an operant test procedure that lasted 90 min. Total activity level and velocity (mean and maximum), standard deviation (SD) and root mean square successive differences (RMSSD) were calculated. In addition, we used Fourier analysis, autocorrelations and two measures of complexity to characterize the time series; sample entropy and symbolic dynamics. RESULTS The SHR/NCrl rats showed increased total activity levels in addition to increased mean and maximum velocity of movements. The variability measures, SD and RMSSD, were markedly lower in the SHR/NCrl compared to the WKY/NHsd rats. At the same time, the SHR/NCrl rats displayed a higher complexity of the time series, particularly with regard to the total activity level as evidenced by analyses of sample entropy and symbolic dynamics. Autocorrelation analyses also showed differences between the two strains. In the Fourier analysis, the SHR/NCrl rats had an increased variance in the high frequency part of the spectrum, corresponding to the time period of 9-17 s. CONCLUSION The findings show that in addition to increased total activity and velocity of movement, the organization of behavior is different in SHR/NCrl relative to WKY/NHsd controls. Compared to controls, behavioral variability is reduced in SHR/NCrl at an aggregate level, and, concomitantly, more complex and unpredictable from moment-to-moment. These finding emphasize the importance of the measures and methods used when characterizing behavioral variability. If valid for ADHD, the results indicate that decreased behavioral variability can co-exist with increased behavioral complexity, thus representing a challenge to current theories of variability in ADHD.
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Affiliation(s)
- Ole Bernt Fasmer
- Department of Clinical Medicine, Section for Psychiatry, Faculty of Medicine and Dentistry, University of Bergen, Bergen, Norway.,Division of Psychiatry, Haukeland University Hospital, Bergen, Norway.,K.G. Jebsen Centre for Research on Neuropsychiatric Disorders, Bergen, Norway
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David N, Schneider TR, Peiker I, Al-Jawahiri R, Engel AK, Milne E. Variability of cortical oscillation patterns: A possible endophenotype in autism spectrum disorders? Neurosci Biobehav Rev 2016; 71:590-600. [DOI: 10.1016/j.neubiorev.2016.09.031] [Citation(s) in RCA: 39] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2015] [Revised: 09/27/2016] [Accepted: 09/30/2016] [Indexed: 11/30/2022]
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120
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Tye C, Johnson KA, Kelly SP, Asherson P, Kuntsi J, Ashwood KL, Azadi B, Bolton P, McLoughlin G. Response time variability under slow and fast-incentive conditions in children with ASD, ADHD and ASD+ADHD. J Child Psychol Psychiatry 2016; 57:1414-1423. [PMID: 27465225 PMCID: PMC5132150 DOI: 10.1111/jcpp.12608] [Citation(s) in RCA: 35] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Accepted: 05/13/2016] [Indexed: 11/29/2022]
Abstract
BACKGROUND Attention deficit hyperactivity disorder (ADHD) and autism spectrum disorder (ASD) show significant behavioural and genetic overlap. Both ADHD and ASD are characterised by poor performance on a range of cognitive tasks. In particular, increased response time variability (RTV) is a promising indicator of risk for both ADHD and ASD. However, it is not clear whether different indices of RTV and changes to RTV according to task conditions are able to discriminate between the two disorders. METHODS Children with ASD (n = 19), ADHD (n = 18), ASD + ADHD (n = 29) and typically developing controls (TDC; n = 26) performed a four-choice RT task with slow-baseline and fast-incentive conditions. Performance was characterised by mean RT (MRT), standard deviation of RT (SD-RT), coefficient of variation (CV) and ex-Gaussian distribution measures of Mu, Sigma and Tau. RESULTS In the slow-baseline condition, categorical diagnoses and trait measures converged to indicate that children with ADHD-only and ASD + ADHD demonstrated increased MRT, SD-RT, CV and Tau compared to TDC and ASD-only. Importantly, greater improvement in MRT, SD-RT and Tau was demonstrated in ADHD and ASD + ADHD from slow-baseline to fast-incentive conditions compared to TDC and ASD-only. CONCLUSIONS Slower and more variable RTs are markers of ADHD compared to ASD and typically developing controls during slow and less rewarding conditions. Energetic factors and rewards improve task performance to a greater extent in children with ADHD compared to children with ASD. These findings suggest that RTV can be distinguished in ASD, ADHD and ASD + ADHD based on the indices of variability used and the conditions in which they are elicited. Further work identifying neural processes underlying increased RTV is warranted, in order to elucidate disorder-specific and disorder-convergent aetiological pathways.
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Affiliation(s)
- Charlotte Tye
- King's College LondonMRC Social Genetic and Developmental Psychiatry CentreInstitute of Psychiatry, Psychology & NeuroscienceLondonUK,King's College LondonChild & Adolescent PsychiatryInstitute of Psychiatry, Psychology & NeuroscienceLondonUK
| | - Katherine A. Johnson
- Melbourne School of Psychological SciencesUniversity of MelbourneMelbourneVic.Australia
| | - Simon P. Kelly
- School of Electrical and Electronic EngineeringUniversity College DublinDublinIreland
| | - Philip Asherson
- King's College LondonMRC Social Genetic and Developmental Psychiatry CentreInstitute of Psychiatry, Psychology & NeuroscienceLondonUK
| | - Jonna Kuntsi
- King's College LondonMRC Social Genetic and Developmental Psychiatry CentreInstitute of Psychiatry, Psychology & NeuroscienceLondonUK
| | - Karen L. Ashwood
- King's College LondonChild & Adolescent PsychiatryInstitute of Psychiatry, Psychology & NeuroscienceLondonUK
| | - Bahare Azadi
- King's College LondonChild & Adolescent PsychiatryInstitute of Psychiatry, Psychology & NeuroscienceLondonUK
| | - Patrick Bolton
- King's College LondonMRC Social Genetic and Developmental Psychiatry CentreInstitute of Psychiatry, Psychology & NeuroscienceLondonUK,King's College LondonChild & Adolescent PsychiatryInstitute of Psychiatry, Psychology & NeuroscienceLondonUK
| | - Gráinne McLoughlin
- King's College LondonMRC Social Genetic and Developmental Psychiatry CentreInstitute of Psychiatry, Psychology & NeuroscienceLondonUK
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Ebejer JL, Medland SE, van der Werf J, Lynskey M, Martin NG, Duffy DL. Variation in Latent Classes of Adult Attention-Deficit Hyperactivity Disorder by Sex and Environmental Adversity. J Atten Disord 2016; 20:934-945. [PMID: 24141099 DOI: 10.1177/1087054713506261] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
OBJECTIVE The findings of genetic, imaging and neuropsychological studies of attention-deficit hyperactivity disorder (ADHD) are mixed. To understand why this might be the case we use both dimensional and categorical symptom measurement to provide alternate and detailed perspectives of symptom expression. METHOD Interviewers collected ADHD, conduct problems (CP) and sociodemographic data from 3793 twins and their siblings aged 22 to 49 (M = 32.6). We estimate linear weighting of symptoms across ADHD and CP items. Latent class analyses and regression describe associations between measured variables, environmental risk factors and subsequent disadvantage. Additionally, the clinical relevance of each class was estimated. RESULTS Five classes were found for women and men; few symptoms, hyperactive-impulsive, CP, inattentive, combined symptoms with CP. Women within the inattentive class reported more symptoms and reduced emotional health when compared to men and to women within other latent classes. Women and men with combined ADHD symptoms reported comorbid conduct problems but those with either inattention or hyperactivity-impulsivity only did not. CONCLUSION The dual perspective of dimensional and categorical measurement of ADHD provides important detail about symptom variation across sex and with environmental covariates.
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Affiliation(s)
- Jane L Ebejer
- University of New England, Australia Queensland Institute of Medical Research, Australia
| | | | | | - Michael Lynskey
- Queensland Institute of Medical Research, Australia King's College London, UK
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Cognitive Load Differentially Impacts Response Control in Girls and Boys with ADHD. JOURNAL OF ABNORMAL CHILD PSYCHOLOGY 2016; 44:141-54. [PMID: 25624066 DOI: 10.1007/s10802-015-9976-z] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
Abstract
Children with attention-deficit hyperactivity disorder (ADHD) consistently show impaired response control, including deficits in response inhibition and increased intrasubject variability (ISV) compared to typically-developing (TD) children. However, significantly less research has examined factors that may influence response control in individuals with ADHD, such as task or participant characteristics. The current study extends the literature by examining the impact of increasing cognitive demands on response control in a large sample of 81children with ADHD (40 girls) and 100 TD children (47 girls), ages 8-12 years. Participants completed a simple Go/No-Go (GNG) task with minimal cognitive demands, and a complex GNG task with increased cognitive load. Results showed that increasing cognitive load differentially impacted response control (commission error rate and tau, an ex-Gaussian measure of ISV) for girls, but not boys, with ADHD compared to same-sex TD children. Specifically, a sexually dimorphic pattern emerged such that boys with ADHD demonstrated higher commission error rate and tau on both the simple and complex GNG tasks as compared to TD boys, whereas girls with ADHD did not differ from TD girls on the simple GNG task, but showed higher commission error rate and tau on the complex GNG task. These findings suggest that task complexity influences response control in children with ADHD in a sexually dimorphic manner. The findings have substantive implications for the pathophysiology of ADHD in boys versus girls with ADHD.
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123
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Global dynamics of selective attention and its lapses in primary auditory cortex. Nat Neurosci 2016; 19:1707-1717. [PMID: 27618311 PMCID: PMC5127770 DOI: 10.1038/nn.4386] [Citation(s) in RCA: 82] [Impact Index Per Article: 10.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/13/2016] [Accepted: 08/11/2016] [Indexed: 12/15/2022]
Abstract
Previous research demonstrated that while selectively attending to relevant aspects of the external world, the brain extracts pertinent information by aligning its neuronal oscillations to key time points of stimuli or their sampling by sensory organs. This alignment mechanism is termed oscillatory entrainment. We investigated the global, long-timescale dynamics of this mechanism in the primary auditory cortex of nonhuman primates, and hypothesized that lapses of entrainment would correspond to lapses of attention. By examining electrophysiological and behavioral measures we observed that besides the lack of entrainment by external stimuli, attentional lapses were characterized by high amplitude alpha oscillations, with alpha frequency structuring of neuronal ensemble and single unit operations. Strikingly, entrainment and alpha oscillation dominated periods were strongly anti-correlated and fluctuated rhythmically at an ultra-slow rate. Our results indicate that these two distinct brain states represent externally versus internally oriented computational resources engaged by large-scale task-positive and task-negative functional networks.
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124
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Anguera JA, Brandes-Aitken AN, Rolle CE, Skinner SN, Desai SS, Bower JD, Martucci WE, Chung WK, Sherr EH, Marco EJ. Characterizing cognitive control abilities in children with 16p11.2 deletion using adaptive 'video game' technology: a pilot study. Transl Psychiatry 2016; 6:e893. [PMID: 27648915 PMCID: PMC5048213 DOI: 10.1038/tp.2016.178] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/06/2016] [Revised: 07/13/2016] [Accepted: 07/18/2016] [Indexed: 02/07/2023] Open
Abstract
Assessing cognitive abilities in children is challenging for two primary reasons: lack of testing engagement can lead to low testing sensitivity and inherent performance variability. Here we sought to explore whether an engaging, adaptive digital cognitive platform built to look and feel like a video game would reliably measure attention-based abilities in children with and without neurodevelopmental disabilities related to a known genetic condition, 16p11.2 deletion. We assessed 20 children with 16p11.2 deletion, a genetic variation implicated in attention deficit/hyperactivity disorder and autism, as well as 16 siblings without the deletion and 75 neurotypical age-matched children. Deletion carriers showed significantly slower response times and greater response variability when compared with all non-carriers; by comparison, traditional non-adaptive selective attention assessments were unable to discriminate group differences. This phenotypic characterization highlights the potential power of administering tools that integrate adaptive psychophysical mechanics into video-game-style mechanics to achieve robust, reliable measurements.
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Affiliation(s)
- J A Anguera
- Department of Neurology, University of California, San Francisco, San Francisco, CA, USA,Department of Psychiatry, University of California, San Francisco, San Francisco, CA, USA,University of California, San Francisco, Mission Bay – Sandler Neurosciences Center, UCSF MC 0444, 675 Nelson Rising Lane, Room 502, San Francisco, CA 94158, USA. E-mail: or
| | - A N Brandes-Aitken
- Department of Neurology, University of California, San Francisco, San Francisco, CA, USA
| | - C E Rolle
- Department of Neurology, University of California, San Francisco, San Francisco, CA, USA
| | - S N Skinner
- Department of Neurology, University of California, San Francisco, San Francisco, CA, USA
| | - S S Desai
- Department of Neurology, University of California, San Francisco, San Francisco, CA, USA
| | - J D Bower
- Akili Interactive Labs, Boston, MA, USA
| | | | - W K Chung
- Department of Pediatrics, Columbia University Medical Center, New York, NY, USA
| | - E H Sherr
- Department of Neurology, University of California, San Francisco, San Francisco, CA, USA,Department of Pediatrics, University of California, San Francisco, San Francisco, CA, USA
| | - E J Marco
- Department of Neurology, University of California, San Francisco, San Francisco, CA, USA,Department of Psychiatry, University of California, San Francisco, San Francisco, CA, USA,Department of Pediatrics, University of California, San Francisco, San Francisco, CA, USA,University of California, San Francisco, Mission Bay – Sandler Neurosciences Center, UCSF MC 0444, 675 Nelson Rising Lane, Room 502, San Francisco, CA 94158, USA. E-mail: or
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125
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Spontaneous eyelid closures link vigilance fluctuation with fMRI dynamic connectivity states. Proc Natl Acad Sci U S A 2016; 113:9653-8. [PMID: 27512040 DOI: 10.1073/pnas.1523980113] [Citation(s) in RCA: 135] [Impact Index Per Article: 16.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022] Open
Abstract
Fluctuations in resting-state functional connectivity occur but their behavioral significance remains unclear, largely because correlating behavioral state with dynamic functional connectivity states (DCS) engages probes that disrupt the very behavioral state we seek to observe. Observing spontaneous eyelid closures following sleep deprivation permits nonintrusive arousal monitoring. During periods of low arousal dominated by eyelid closures, sliding-window correlation analysis uncovered a DCS associated with reduced within-network functional connectivity of default mode and dorsal/ventral attention networks, as well as reduced anticorrelation between these networks. Conversely, during periods when participants' eyelids were wide open, a second DCS was associated with less decoupling between the visual network and higher-order cognitive networks that included dorsal/ventral attention and default mode networks. In subcortical structures, eyelid closures were associated with increased connectivity between the striatum and thalamus with the ventral attention network, and greater anticorrelation with the dorsal attention network. When applied to task-based fMRI data, these two DCS predicted interindividual differences in frequency of behavioral lapsing and intraindividual temporal fluctuations in response speed. These findings with participants who underwent a night of total sleep deprivation were replicated in an independent dataset involving partially sleep-deprived participants. Fluctuations in functional connectivity thus appear to be clearly associated with changes in arousal.
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126
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Sørensen L, Eichele T, van Wageningen H, Plessen KJ, Stevens MC. Amplitude variability over trials in hemodynamic responses in adolescents with ADHD: The role of the anterior default mode network and the non-specific role of the striatum. NEUROIMAGE-CLINICAL 2016; 12:397-404. [PMID: 27622136 PMCID: PMC5008047 DOI: 10.1016/j.nicl.2016.08.007] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/07/2016] [Revised: 08/05/2016] [Accepted: 08/07/2016] [Indexed: 11/25/2022]
Abstract
It has been suggested that intra-individual variability (IIV) in performance on attention and other cognitive tasks might be a cognitive endophenotype in individuals with ADHD. Despite robust IIV findings in behavioral data, only sparse data exist on how what type of brain dysfunction underlies variable response times. In this study, we asked whether ADHD IIV in reaction time on a commonly-used test of attention might be related to variation in hemodynamic responses (HRs) observed trial-to-trial. Based on previous studies linking IIV to regions within the “default mode” network (DMN), we predicted that adolescents with ADHD would have higher HR variability in the DMN compared with controls, and this in turn would be related to behavioral IIV. We also explored the influence of social anxiety on HR variability in ADHD as means to test whether higher arousal associated with high trait anxiety would affect the neural abnormalities. We assessed single-trial variability of HRs, estimated from fMRI event-related responses elicited during an auditory oddball paradigm in adolescents with ADHD and healthy controls (11–18 years old; N = 46). Adolescents with ADHD had higher HR variability compared with controls in anterior regions of the DMN. This effect was specific to ADHD and not associated with traits of age, IQ and anxiety. However, an ADHD effect of higher HR variability also appeared in a basal ganglia network, but for these brain regions the relationships of HR variability and social anxiety levels were more complex. Performance IIV correlated significantly with variability of HRs in both networks. These results suggest that assessment of trial-to-trial HR variability in ADHD provides information beyond that detectable through analysis of behavioral data and average brain activation levels, revealing specific neural correlates of a possible ADHD IIV endophenotype. We studied if the behavioral variability in ADHD is also found on a neuronal level. Independent component analysis was combined with BOLD amplitude variability. Adolescents with ADHD had higher amplitude variability than healthy controls. Higher amplitude variability was shown in an anterior default mode network. Social anxiety in ADHD associated with high amplitude variability in the striatum
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Affiliation(s)
- L Sørensen
- Department of Biological and Medical Psychology, University of Bergen, Norway; Division of Psychiatry, Haukeland University Hospital, Bergen, Norway; K. G. Jebsen Centre for Neuropsychiatric Disorders, Bergen, Norway
| | - T Eichele
- Department of Biological and Medical Psychology, University of Bergen, Norway; K. G. Jebsen Centre for Neuropsychiatric Disorders, Bergen, Norway; Section for Clinical Neurophysiology, Department of Neurology, Haukeland University Hospital, Norway; The MIND Research Network, Albuquerque, NM, United States
| | - H van Wageningen
- Department of Biological and Medical Psychology, University of Bergen, Norway; K. G. Jebsen Centre for Neuropsychiatric Disorders, Bergen, Norway
| | - K J Plessen
- K. G. Jebsen Centre for Neuropsychiatric Disorders, Bergen, Norway; Child and Adolescent Mental Health Centre, Capital Region, Copenhagen, Denmark; Department of Clinical Medicine, University of Copenhagen, Denmark
| | - M C Stevens
- Olin Neuropsychiatry Research Center, Institute of Living, Hartford, CT, United States; Department of Psychiatry, Yale University School of Medicine, New Haven, CT, United States
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Bennett MR, Hatton S, Hermens DF, Lagopoulos J. Behavior, neuropsychology and fMRI. Prog Neurobiol 2016; 145-146:1-25. [PMID: 27393370 DOI: 10.1016/j.pneurobio.2016.07.001] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/06/2016] [Revised: 06/14/2016] [Accepted: 07/03/2016] [Indexed: 11/19/2022]
Abstract
Cognitive neuroscientists in the late 20th century began the task of identifying the part(s) of the brain concerned with normal behavior as manifest in the psychological capacities as affective powers, reasoning, behaving purposively and the pursuit of goals, following introduction of the 'functional magnetic resonance imaging' (fMRI) method for identifying brain activity. For this research program to be successful two questions require satisfactory answers. First, as the fMRI method can currently only be used on stationary subjects, to what extent can neuropsychological tests applicable to such stationary subjects be correlated with normal behavior. Second, to what extent can correlations between the various neuropsychological tests on the one hand, and sites of brain activity determined with fMRI on the other, be regarded as established. The extent to which these questions have yet received satisfactory answers is reviewed, and suggestions made both for improving correlations of neuropsychological tests with behavior as well as with the results of fMRI-based observations.
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Affiliation(s)
- Maxwell R Bennett
- Brain & Mind Centre, University of Sydney, Camperdown, NSW 2050, Australia.
| | - Sean Hatton
- Brain & Mind Centre, University of Sydney, Camperdown, NSW 2050, Australia.
| | - Daniel F Hermens
- Brain & Mind Centre, University of Sydney, Camperdown, NSW 2050, Australia.
| | - Jim Lagopoulos
- Brain & Mind Centre, University of Sydney, Camperdown, NSW 2050, Australia; Sunshine Coast Mind and Neuroscience - Thompson Institute, Birtinya, QLD, Australia.
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128
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Biscaldi M, Bednorz N, Weissbrodt K, Saville C, Feige B, Bender S, Klein C. Cognitive endophenotypes of attention deficit/hyperactivity disorder and intra-subject variability in patients with autism spectrum disorder. Biol Psychol 2016; 118:25-34. [DOI: 10.1016/j.biopsycho.2016.04.064] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/06/2015] [Revised: 04/25/2016] [Accepted: 04/26/2016] [Indexed: 10/21/2022]
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129
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The Moderating Role of Attention Biases in understanding the link between Behavioral Inhibition and Anxiety. J Exp Psychopathol 2016; 7:451-465. [PMID: 30498566 DOI: 10.5127/jep.052515] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/22/2022] Open
Abstract
The current study aimed to extend the results of White et al. (2015) by examining the moderating role of attention biases at age 5 on the relations between Behavioral Inhibition (BI) during toddlerhood and anxiety symptoms at age 10. Children's BI at 2 and 3 years of age was measured using laboratory assessments, and attention bias towards threat was assessed using a dot-probe task at age 5. Latent Class Analysis (LCA) was used to identify the probability for children's membership in an anxiety class, which reflected primary anxiety at age 10 that was not comorbid with symptoms of inattention. Maternal and self-report measures of children's mental health, collected via questionnaires and semi-structured diagnostic interviews, were used as indicators for the LCA. The results revealed that threat-related attention biases moderated the relation between BI and anxiety, such that BI positively predicted the probability of being in the anxiety class only when children had an attention bias towards threat. BI was unrelated to anxiety when children had no attention bias or an attention bias away from threat. These results indicated that attention biases during preschool may differentiate between inhibited children who are at heightened risk for anxiety later in childhood from those who are not. The results are discussed in a framework detailing the role of attention biases in increasing the sensitivity for anxiety-related problems in children who display high levels of BI during early childhood.
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130
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Hong SS, Cho SH. Treating attention deficit hyperactivity disorder with acupuncture: A randomized controlled trial. Eur J Integr Med 2016. [DOI: 10.1016/j.eujim.2015.11.018] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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131
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Adleman NE, Chen G, Reynolds RC, Frackman A, Razdan V, Weissman DH, Pine DS, Leibenluft E. Age-related differences in the neural correlates of trial-to-trial variations of reaction time. Dev Cogn Neurosci 2016; 19:248-57. [PMID: 27239972 PMCID: PMC5099497 DOI: 10.1016/j.dcn.2016.05.001] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/10/2015] [Revised: 05/06/2016] [Accepted: 05/08/2016] [Indexed: 12/31/2022] Open
Abstract
Intra-subject variation in reaction time (ISVRT) is a developmentally-important phenomenon that decreases from childhood through young adulthood in parallel with the development of executive functions and networks. Prior work has shown a significant association between trial-by-trial variations in reaction time (RT) and trial-by-trial variations in brain activity as measured by the blood-oxygenated level-dependent (BOLD) response in functional magnetic resonance imaging (fMRI) studies. It remains unclear, however, whether such "RT-BOLD" relationships vary with age. Here, we determined whether such trial-by-trial relationships vary with age in a cross-sectional design. We observed an association between age and RT-BOLD relationships in 11 clusters located in visual/occipital regions, frontal and parietal association cortex, precentral/postcentral gyrus, and thalamus. Some of these relationships were negative, reflecting increased BOLD associated with decreased RT, manifesting around the time of stimulus presentation and positive several seconds later. Critically for present purposes, all RT-BOLD relationships increased with age. Thus, RT-BOLD relationships may reflect robust, measurable changes in the brain-behavior relationship across development.
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Affiliation(s)
- Nancy E Adleman
- Department of Psychology, The Catholic University of America, 620 Michigan Ave., NE, Washington, DC 20064, USA; Emotion and Development Branch, National Institute of Mental Health, National Institutes of Health, 9000 Rockville Pike, Bethesda, MD 20892, USA.
| | - Gang Chen
- Scientific and Statistical Computing Core, National Institute of Mental Health, National Institutes of Health, 9000 Rockville Pike, Bethesda, MD 20892, USA.
| | - Richard C Reynolds
- Scientific and Statistical Computing Core, National Institute of Mental Health, National Institutes of Health, 9000 Rockville Pike, Bethesda, MD 20892, USA.
| | - Anna Frackman
- Emotion and Development Branch, National Institute of Mental Health, National Institutes of Health, 9000 Rockville Pike, Bethesda, MD 20892, USA.
| | - Varun Razdan
- Emotion and Development Branch, National Institute of Mental Health, National Institutes of Health, 9000 Rockville Pike, Bethesda, MD 20892, USA.
| | - Daniel H Weissman
- Department of Psychology, University of Michigan, 530 Church St, Ann Arbor, MI 48109, USA.
| | - Daniel S Pine
- Emotion and Development Branch, National Institute of Mental Health, National Institutes of Health, 9000 Rockville Pike, Bethesda, MD 20892, USA.
| | - Ellen Leibenluft
- Emotion and Development Branch, National Institute of Mental Health, National Institutes of Health, 9000 Rockville Pike, Bethesda, MD 20892, USA.
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132
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Castellanos FX, Aoki Y. Intrinsic Functional Connectivity in Attention-Deficit/Hyperactivity Disorder: A Science in Development. BIOLOGICAL PSYCHIATRY: COGNITIVE NEUROSCIENCE AND NEUROIMAGING 2016; 1:253-261. [PMID: 27713929 DOI: 10.1016/j.bpsc.2016.03.004] [Citation(s) in RCA: 84] [Impact Index Per Article: 10.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
Functional magnetic resonance imaging (fMRI) without an explicit task, i.e., resting state fMRI, of individuals with Attention-Deficit/Hyperactivity Disorder (ADHD) is growing rapidly. Early studies were unaware of the vulnerability of this method to even minor degrees of head motion, a major concern in the field. Recent efforts are implementing various strategies to address this source of artifact along with a growing set of analytical tools. Availability of the ADHD-200 Consortium dataset, a large-scale multi-site repository, is facilitating increasingly sophisticated approaches. In parallel, investigators are beginning to explicitly test the replicability of published findings. In this narrative review, we sketch out broad, overarching hypotheses being entertained while noting methodological uncertainties. Current hypotheses implicate the interplay of default, cognitive control (frontoparietal) and attention (dorsal, ventral, salience) networks in ADHD; functional connectivities of reward-related and amygdala-related circuits are also supported as substrates for dimensional aspects of ADHD. Before these can be further specified and definitively tested, we assert the field must take on the challenge of mapping the "topography" of the analytical space, i.e., determining the sensitivities of results to variations in acquisition, analysis, demographic and phenotypic parameters. Doing so with openly available datasets will provide the needed foundation for delineating typical and atypical developmental trajectories of brain structure and function in neurodevelopmental disorders including ADHD when applied to large-scale multi-site prospective longitudinal studies such as the forthcoming Adolescent Brain Cognitive Development study.
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Affiliation(s)
- F Xavier Castellanos
- The Child Study Center at NYU Langone Medical Center, New York, NY; Nathan S. Kline Institute for Psychiatric Research, Orangeburg, NY
| | - Yuta Aoki
- The Child Study Center at NYU Langone Medical Center, New York, NY
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133
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Ni HC, Hwang Gu SL, Lin HY, Lin YJ, Yang LK, Huang HC, Gau SSF. Atomoxetine could improve intra-individual variability in drug-naïve adults with attention-deficit/hyperactivity disorder comparably with methylphenidate: A head-to-head randomized clinical trial. J Psychopharmacol 2016; 30:459-67. [PMID: 26905919 DOI: 10.1177/0269881116632377] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
OBJECTIVE Intra-individual variability in reaction time (IIV-RT) is common in individuals with attention-deficit/hyperactivity disorder (ADHD). It can be improved by stimulants. However, the effects of atomoxetine on IIV-RT are inconclusive. We aimed to investigate the effects of atomoxetine on IIV-RT, and directly compared its efficacy with methylphenidate in adults with ADHD. METHODS An 8-10 week, open-label, head-to-head, randomized clinical trial was conducted in 52 drug-naïve adults with ADHD, who were randomly assigned to two treatment groups: immediate-release methylphenidate (n=26) thrice daily (10-20 mg per dose) and atomoxetine once daily (n=26) (0.5-1.2 mg/kg/day). IIV-RT, derived from the Conners' continuous performance test (CCPT), was represented by the Gaussian (reaction time standard error, RTSE) and ex-Gaussian models (sigma and tau). Other neuropsychological functions, including response errors and mean of reaction time, were also measured. Participants received CCPT assessments at baseline and week 8-10 (60.4±6.3 days). RESULTS We found comparable improvements in performances of CCPT between the immediate-release methylphenidate- and atomoxetine-treated groups. Both medications significantly improved IIV-RT in terms of reducing tau values with comparable efficacy. In addition, both medications significantly improved inhibitory control by reducing commission errors. CONCLUSION Our results provide evidence to support that atomoxetine could improve IIV-RT and inhibitory control, of comparable efficacy with immediate-release methylphenidate, in drug-naïve adults with ADHD. Shared and unique mechanisms underpinning these medication effects on IIV-RT awaits further investigation.
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Affiliation(s)
- Hsing-Chang Ni
- Department of Psychiatry, National Taiwan University Hospital, Taipei, Taiwan Graduate Institute of Clinical Medicine, National Taiwan University College of Medicine, Taipei, Taiwan Department of Psychiatry, Chang Gung Memorial Hospital at Linkou, Taiwan
| | - Shoou-Lian Hwang Gu
- Graduate Institute of Behavioral Sciences, College of Medicine, Chang Gung University, Tao-Yuan, Taiwan
| | - Hsiang-Yuan Lin
- Department of Psychiatry, National Taiwan University Hospital, Taipei, Taiwan
| | - Yu-Ju Lin
- Department of Psychiatry, National Taiwan University Hospital, Taipei, Taiwan Department of Psychiatry, Far Eastern Memorial Hospital, Taipei, Taiwan Department of Psychiatry, College of Medicine, National Taiwan University, Taipei, Taiwan
| | - Li-Kuang Yang
- Department of Psychiatry, National Taiwan University Hospital, Taipei, Taiwan Department of Psychiatry, Beitou Branch, Tri-Service General Hospital, National Defense Medical Center, Taipei, Taiwan Graduate Institute of Brain and Mind Sciences, College of Medicine, National Taiwan University, Taipei, Taiwan
| | - Hui-Chun Huang
- Department of Child and Adolescent Psychiatry, Taoyaun Psychiatric Center, Ministry of Health and Welfare, Taoyuan County, Taiwan
| | - Susan Shur-Fen Gau
- Department of Psychiatry, National Taiwan University Hospital, Taipei, Taiwan Graduate Institute of Clinical Medicine, National Taiwan University College of Medicine, Taipei, Taiwan Department of Psychiatry, College of Medicine, National Taiwan University, Taipei, Taiwan Graduate Institute of Brain and Mind Sciences, College of Medicine, National Taiwan University, Taipei, Taiwan
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134
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Kakuszi B, Tombor L, Papp S, Bitter I, Czobor P. Altered response-preparation in patients with adult ADHD: A high-density ERP study. Psychiatry Res Neuroimaging 2016; 249:57-66. [PMID: 27000308 DOI: 10.1016/j.pscychresns.2016.02.008] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/11/2015] [Revised: 02/17/2016] [Accepted: 02/20/2016] [Indexed: 11/24/2022]
Abstract
Aberrations in early-developing bottom-up processes, such as stimulus-driven response preparation, are thought to play a critical role in the onset of ADHD, and in its persistence over time. Electrophysiology offers a unique tool to gain insight into response preparation, since response preparation has been associated with distinctive ERP changes, including negative potential-shifts which occur predominantly over frontal brain areas. We examined response-preceding negative potential shifts (RPNS) as a probe of response-preparation in adult ADHD patients by obtaining high-density event-related potentials from 33 ADHD and 29 matched healthy subjects during a Go/Nogo task using a 128-channel BioSemi recording-system. Compared to controls, ADHD patients showed enhancement of the RPNS in fronto-central brain regions in the Go condition during correct responses. This change was associated with poor performance in the Stroop incongruency-task: the greater the enhancement, the higher the proportion of errors. Moreover, the ERP-enhancement showed association with the severity of ADHD-symptoms; and with heightened response-variability. Thus, ADHD patients demonstrate neurophysiological alterations in response-preparation and response-preceding brain activity, suggestive of excessive activation of prefrontal neural circuits. Given the correlation with neuropsychological and psychopathological measures, these changes may constitute a pathway for core symptoms of ADHD, including premature and impaired response-preparation and motor-hyperactivity.
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Affiliation(s)
- Brigitta Kakuszi
- Semmelweis University, Department of Psychiatry and Psychotherapy, Budapest, Hungary
| | - László Tombor
- Semmelweis University, Department of Psychiatry and Psychotherapy, Budapest, Hungary
| | - Szilvia Papp
- Semmelweis University, Department of Psychiatry and Psychotherapy, Budapest, Hungary
| | - István Bitter
- Semmelweis University, Department of Psychiatry and Psychotherapy, Budapest, Hungary
| | - Pál Czobor
- Semmelweis University, Department of Psychiatry and Psychotherapy, Budapest, Hungary; Nathan Kline Institute for Psychiatric Research, Orangeburg, NY, USA.
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135
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Sjöwall D, Backman A, Thorell LB. Neuropsychological heterogeneity in preschool ADHD: investigating the interplay between cognitive, affective and motivation-based forms of regulation. JOURNAL OF ABNORMAL CHILD PSYCHOLOGY 2016; 43:669-80. [PMID: 25239053 PMCID: PMC4429028 DOI: 10.1007/s10802-014-9942-1] [Citation(s) in RCA: 35] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
There is a trend toward diagnosing ADHD prior to school entry. Despite this, there is a lack of studies investigating ADHD in the preschool years, at least studies including a large range of different neuropsychological functions. Our knowledge of the independent effects of different neuropsychological functions in relation to preschool ADHD is therefore limited. In order to address this issue, the present study investigated cognitive, affective, and motivation-based regulation in relation to ADHD symptoms in 104 preschool children (age M = 67.33 months, SD = 10.10; 65 % boys). Results showed that these regulatory processes were all significantly related to ADHD symptoms and that most of these relations remained after controlling for comorbid conduct problems. Most previous preschool studies have only included cognitive regulation, and to some extent motivation-based regulation. By also including affective regulation, we were able to explain a larger proportion of the variance in ADHD symptoms. However, it should be noted that the amount of variance explained was still small in comparison with what has been found in previous studies of school-aged children. This finding could be taken as an indication that further studies examining the nature of preschool ADHD are needed, and that it may be necessary to look beyond the neuropsychological factors that have been linked to the disorder in older children and adults.
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Affiliation(s)
- Douglas Sjöwall
- Department of Clinical Neuroscience, Karolinska Institutet, Stockholm, Sweden
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136
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Popa A, McDowell JJ. Behavioral variability in an evolutionary theory of behavior dynamics. J Exp Anal Behav 2016; 105:270-90. [DOI: 10.1002/jeab.199] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/10/2015] [Revised: 02/17/2016] [Accepted: 02/17/2016] [Indexed: 01/15/2023]
Affiliation(s)
- Andrei Popa
- Department of Psychology; Agnes Scott College; Decatur GA
| | - J. J McDowell
- Department of Psychology; Emory University; Atlanta GA
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137
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Baijot S, Slama H, Söderlund G, Dan B, Deltenre P, Colin C, Deconinck N. Neuropsychological and neurophysiological benefits from white noise in children with and without ADHD. Behav Brain Funct 2016; 12:11. [PMID: 26979812 PMCID: PMC4791764 DOI: 10.1186/s12993-016-0095-y] [Citation(s) in RCA: 36] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/01/2015] [Accepted: 03/09/2016] [Indexed: 12/02/2022] Open
Abstract
Background Optimal stimulation theory and moderate brain arousal (MBA) model hypothesize that extra-task stimulation (e.g. white noise) could improve cognitive functions of children with attention-deficit/hyperactivity disorder (ADHD). We investigate benefits of white noise on attention and inhibition in children with and without ADHD (7–12 years old), both at behavioral and at neurophysiological levels. Methods Thirty children with and without ADHD performed a visual cued Go/Nogo task in two conditions (white noise or no-noise exposure), in which behavioral and P300 (mean amplitudes) data were analyzed. Spontaneous eye-blink rates were also recorded and participants went through neuropsychological assessment. Two separate analyses were conducted with each child separately assigned into two groups (1) ADHD or typically developing children (TDC), and (2) noise beneficiaries or non-beneficiaries according to the observed performance during the experiment. This latest categorization, based on a new index we called “Noise Benefits Index” (NBI), was proposed to determine a neuropsychological profile positively sensitive to noise. Results Noise exposure reduced omission rate in children with ADHD, who were no longer different from TDC. Eye-blink rate was higher in children with ADHD but was not modulated by white noise. NBI indicated a significant relationship between ADHD and noise benefit. Strong correlations were observed between noise benefit and neuropsychological weaknesses in vigilance and inhibition. Participants who benefited from noise had an increased Go P300 in the noise condition. Conclusion The improvement of children with ADHD with white noise supports both optimal stimulation theory and MBA model. However, eye-blink rate results question the dopaminergic hypothesis in the latter. The NBI evidenced a profile positively sensitive to noise, related with ADHD, and associated with weaker cognitive control.
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Affiliation(s)
- Simon Baijot
- Center for Research in Cognition and Neurosciences (CRCN), Université Libre de Bruxelles (ULB), Campus du Solbosch CP 191, Avenue F.D. Roosevelt 50, CP 151, 1050, Brussels, Belgium. .,Research Unit in Cognitive Neurosciences (UNESCOG), Université Libre de Bruxelles (ULB), 1050, Brussels, Belgium. .,Department of Neurology, Queen Fabiola Children's University Hospital (HUDERF), Université Libre de Bruxelles (ULB), Avenue Jean-Joseph Crocq, 15, 1020, Brussels, Belgium.
| | - Hichem Slama
- Center for Research in Cognition and Neurosciences (CRCN), Université Libre de Bruxelles (ULB), Campus du Solbosch CP 191, Avenue F.D. Roosevelt 50, CP 151, 1050, Brussels, Belgium.,Research Unit in Cognitive Neurosciences (UNESCOG), Université Libre de Bruxelles (ULB), 1050, Brussels, Belgium.,Neuropsychology and Functional Neuroimaging Research Group (UR2NF), Université Libre de Bruxelles (ULB), 1050, Brussels, Belgium.,Department of Clinical and Cognitive Neuropsychology, Erasme Hospital, Université Libre de Bruxelles (ULB), Route de Lennik, 808, 1070, Brussels, Belgium
| | - Göran Söderlund
- Faculty of Teacher Education and Sports, Sogn og Fjordane, University College, Sogndal, Norway
| | - Bernard Dan
- Department of Neurology, Queen Fabiola Children's University Hospital (HUDERF), Université Libre de Bruxelles (ULB), Avenue Jean-Joseph Crocq, 15, 1020, Brussels, Belgium.,Inkendaal Rehabilitation Hospital, Vlezenbeek, Belgium
| | - Paul Deltenre
- Laboratory of Cognitive and Sensory Neurophysiology, CHU Brugmann, Université Libre de Bruxelles (ULB), Place Van Gehuchten, 4, 1020, Brussels, Belgium
| | - Cécile Colin
- Center for Research in Cognition and Neurosciences (CRCN), Université Libre de Bruxelles (ULB), Campus du Solbosch CP 191, Avenue F.D. Roosevelt 50, CP 151, 1050, Brussels, Belgium.,Research Unit in Cognitive Neurosciences (UNESCOG), Université Libre de Bruxelles (ULB), 1050, Brussels, Belgium.,Laboratory of Cognitive and Sensory Neurophysiology, CHU Brugmann, Université Libre de Bruxelles (ULB), Place Van Gehuchten, 4, 1020, Brussels, Belgium
| | - Nicolas Deconinck
- Department of Neurology, Queen Fabiola Children's University Hospital (HUDERF), Université Libre de Bruxelles (ULB), Avenue Jean-Joseph Crocq, 15, 1020, Brussels, Belgium
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138
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The interaction between reinforcement and inhibitory control in ADHD: A review and research guidelines. Clin Psychol Rev 2016; 44:94-111. [DOI: 10.1016/j.cpr.2016.01.001] [Citation(s) in RCA: 37] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/26/2014] [Revised: 12/01/2015] [Accepted: 01/05/2016] [Indexed: 12/21/2022]
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139
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Henríquez RA, Chica AB, Billeke P, Bartolomeo P. Fluctuating Minds: Spontaneous Psychophysical Variability during Mind-Wandering. PLoS One 2016; 11:e0147174. [PMID: 26863144 PMCID: PMC4749381 DOI: 10.1371/journal.pone.0147174] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/09/2015] [Accepted: 12/30/2015] [Indexed: 11/18/2022] Open
Abstract
Mind-wandering is the occasional distraction we experience while performing a cognitive task. It arises without any external precedent, varies over time, and interferes with the processing of sensory information. Here, we asked whether the transition from the on-task state to mind-wandering is a gradual process or an abrupt event. We developed a new experimental approach, based on the continuous, online assessment of individual psychophysical performance. Probe questions were asked whenever response times (RTs) exceeded 2 standard deviations from the participant’s average RT. Results showed that mind-wandering reports were generally preceded by slower RTs, as compared to trials preceding on-task reports. Mind-wandering episodes could be reliably predicted from the response time difference between the last and the second-to-last trials. Thus, mind-wandering reports follow an abrupt increase in behavioral variability, lasting between 2.5 and 10 seconds.
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Affiliation(s)
- Rodrigo A. Henríquez
- Inserm U 1127, F-75013, Paris, France
- Sorbonne Universités, UPMC Univ Paris 06, UMR S 1127, F-75013, Paris, France
- CNRS, UMR 7225, F-75013, Paris, France
- Institut du Cerveau et de la Moelle épinière, ICM, F-75013, Paris, France
- * E-mail:
| | - Ana B. Chica
- Department of Experimental Psychology, and Brain, Mind, and Behaviour Research Center, University of Granada, Granada, Spain
| | - Pablo Billeke
- Research Center for Social Complexity, Faculty of Government, University of Desarrollo, Santiago, Chile
| | - Paolo Bartolomeo
- Inserm U 1127, F-75013, Paris, France
- Sorbonne Universités, UPMC Univ Paris 06, UMR S 1127, F-75013, Paris, France
- CNRS, UMR 7225, F-75013, Paris, France
- Institut du Cerveau et de la Moelle épinière, ICM, F-75013, Paris, France
- Department of Psychology, Catholic University Milan, Milan, Italy
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140
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Fuentes-Claramonte P, Ávila C, Rodríguez-Pujadas A, Costumero V, Ventura-Campos N, Bustamante JC, Rosell-Negre P, Barrós-Loscertales A. Inferior frontal cortex activity is modulated by reward sensitivity and performance variability. Biol Psychol 2016; 114:127-37. [DOI: 10.1016/j.biopsycho.2016.01.001] [Citation(s) in RCA: 49] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2015] [Revised: 12/24/2015] [Accepted: 01/03/2016] [Indexed: 01/11/2023]
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141
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Shahar N, Teodorescu AR, Karmon-Presser A, Anholt GE, Meiran N. Memory for Action Rules and Reaction Time Variability in Attention-Deficit/Hyperactivity Disorder. BIOLOGICAL PSYCHIATRY: COGNITIVE NEUROSCIENCE AND NEUROIMAGING 2016; 1:132-140. [PMID: 29560873 DOI: 10.1016/j.bpsc.2016.01.003] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/03/2015] [Revised: 01/13/2016] [Accepted: 01/13/2016] [Indexed: 11/15/2022]
Abstract
BACKGROUND Patients with attention-deficit/hyperactivity disorder (ADHD) exhibit increased reaction time (RT) variability. This finding is consistent across various choice RT tasks and is considered a core ADHD phenotype, often interpreted as expressing occasional attention lapses. This study explores the selective contribution of perceptual and working memory (WM) processes to increased RT variability in ADHD. METHODS Low and high WM demands were manipulated in a battery of choice RT tasks administered to two groups of college students (subjects with ADHD vs. healthy control subjects). RESULTS Ex-Gaussian distribution fitting revealed an increased rate of exceptionally slow RTs (i.e., higher τ values) in subjects with ADHD under all conditions. These group differences interacted with WM demands, showing the largest group differences when WM processing was most demanding (ηp2 = .32). Under demanding WM conditions, evidence accumulation modeling demonstrated that increased RT variability in ADHD is not associated with either momentary or constant deficits in perceptual processing of the target. Rather, results favored a model associating increased RT variability in ADHD with reduced rate of WM retrieval. CONCLUSIONS These results suggest a pivotal contribution for the retrieval of action rules from WM to increased RT variability in ADHD.
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Affiliation(s)
- Nitzan Shahar
- Department of Psychology and Zlotowski Center for Neuroscience (NS, AK-P, GEA, NM), Ben-Gurion University of the Negev, Beer-Sheva, Israel.
| | - Andrei R Teodorescu
- Department of Psychological and Brain Sciences (ART), Indiana University, Bloomington, Indiana
| | - Anat Karmon-Presser
- Department of Psychology and Zlotowski Center for Neuroscience (NS, AK-P, GEA, NM), Ben-Gurion University of the Negev, Beer-Sheva, Israel
| | - Gideon E Anholt
- Department of Psychology and Zlotowski Center for Neuroscience (NS, AK-P, GEA, NM), Ben-Gurion University of the Negev, Beer-Sheva, Israel
| | - Nachshon Meiran
- Department of Psychology and Zlotowski Center for Neuroscience (NS, AK-P, GEA, NM), Ben-Gurion University of the Negev, Beer-Sheva, Israel
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142
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Moss RA, Finkelmeyer A, Robinson LJ, Thompson JM, Watson S, Ferrier IN, Gallagher P. The Impact of Target Frequency on Intra-Individual Variability in Euthymic Bipolar Disorder: A Comparison of Two Sustained Attention Tasks. Front Psychiatry 2016; 7:106. [PMID: 27378954 PMCID: PMC4909748 DOI: 10.3389/fpsyt.2016.00106] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/29/2016] [Accepted: 06/03/2016] [Indexed: 01/22/2023] Open
Abstract
Greater intra-individual variability (IIV) in reaction time (RT) on a sustained attention task has been reported in patients with bipolar disorder (BD) compared with healthy controls. However, it is unclear whether IIV is task specific, or whether it represents general cross-task impairment in BD. This study aimed to investigate whether IIV occurs in sustained attention tasks with different parameters. Twenty-two patients with BD (currently euthymic) and 17 controls completed two sustained attention tasks on different occasions: a low target frequency (~20%) Vigil continuous performance test (CPT) and a high target frequency (~70%) CPT version A-X (CPT-AX). Variability measures (individual standard deviation and coefficient of variation) were calculated per participant, and ex-Gaussian modeling was also applied. This was supplemented by Vincentile analysis to characterize RT distributions. Results indicated that participants (patients and controls) were generally slower and more variable when completing the Vigil CPT compared with CPT-AX. Significant group differences were also observed in the Vigil CPT, with euthymic BD patients being more variable than controls. This result suggests that IIV in BD demonstrates some degree of task specificity. Further research should incorporate analysis of additional RT distributional models (drift diffusion and fast Fourier transform) to fully characterize the pattern of IIV in BD, as well as its relationship to cognitive processes.
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Affiliation(s)
| | | | - Lucy J Robinson
- Institute of Neuroscience, Newcastle upon Tyne, UK; Northumberland, Tyne and Wear NHS Foundation Trust, Newcastle upon Tyne, UK
| | | | - Stuart Watson
- Institute of Neuroscience , Newcastle upon Tyne , UK
| | - I Nicol Ferrier
- Institute of Neuroscience, Newcastle upon Tyne, UK; Northumberland, Tyne and Wear NHS Foundation Trust, Newcastle upon Tyne, UK
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143
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Adolescent methylphenidate treatment differentially alters adult impulsivity and hyperactivity in the Spontaneously Hypertensive Rat model of ADHD. Pharmacol Biochem Behav 2015; 141:66-77. [PMID: 26657171 DOI: 10.1016/j.pbb.2015.12.002] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/01/2015] [Revised: 09/30/2015] [Accepted: 12/01/2015] [Indexed: 12/30/2022]
Abstract
Impulsivity and hyperactivity are two facets of attention deficit/hyperactivity disorder (ADHD). Impulsivity is expressed as reduced response inhibition capacity, an executive control mechanism that prevents premature execution of an intermittently reinforced behavior. During methylphenidate treatment, impulsivity and hyperactivity are decreased in adolescents with ADHD, but there is little information concerning levels of impulsivity and hyperactivity in adulthood after adolescent methylphenidate treatment is discontinued. The current study evaluated impulsivity, hyperactivity as well as cocaine sensitization during adulthood after adolescent methylphenidate treatment was discontinued in the Spontaneously Hypertensive Rat (SHR) model of ADHD. Treatments consisted of oral methylphenidate (1.5mg/kg) or water vehicle provided Monday-Friday from postnatal days 28-55. During adulthood, impulsivity was measured in SHR and control strains (Wistar Kyoto and Wistar rats) using differential reinforcement of low rate (DRL) schedules. Locomotor activity and cocaine sensitization were measured using the open-field assay. Adult SHR exhibited decreased efficiency of reinforcement under the DRL30 schedule and greater levels of locomotor activity and cocaine sensitization compared to control strains. Compared to vehicle, methylphenidate treatment during adolescence reduced hyperactivity in adult SHR, maintained the lower efficiency of reinforcement, and increased burst responding under DRL30. Cocaine sensitization was not altered following adolescent methylphenidate in adult SHR. In conclusion, adolescent treatment with methylphenidate followed by discontinuation in adulthood had a positive benefit by reducing hyperactivity in adult SHR rats; however, increased burst responding under DRL compared to SHR given vehicle, i.e., elevated impulsivity, constituted an adverse consequence associated with increased risk for cocaine abuse liability.
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144
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van Belle J, van Hulst BM, Durston S. Developmental differences in intra-individual variability in children with ADHD and ASD. J Child Psychol Psychiatry 2015; 56:1316-26. [PMID: 25871802 DOI: 10.1111/jcpp.12417] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Accepted: 03/15/2015] [Indexed: 02/01/2023]
Abstract
BACKGROUND Intra-individual variability reflects temporal variation within an individual's performance on a cognitive task. Children with developmental disorders, such as ADHD and ASD show increased levels of intra-individual variability. In typical development, intra-individual variability decreases sharply between the ages 6 and 20. The tight link between intra-individual variability and age has led to the suggestion that it may be marker of neural development. As there is accumulating evidence that ADHD and ASD are characterised by atypical neurodevelopmental trajectories, we set out to explore developmental changes in intra-individual variability in subjects with ADHD and ASD. METHOD We used propensity score matching to match a cross-sectional sample of children with ADHD, ASD and control subjects (N = 405, aged 6-19 years old) for age, IQ and gender. We used ex-Gaussian distribution parameters to characterise intra-individual variability on fast responses (sigma) and slow responses (tau). RESULT Results showed that there was a similar decrease in mean response times with age across groups, and an interaction between age and group for measures of variability, where there was a much lower rate of change in the variability parameters (sigma and tau) for subjects with ASD compared with the other two groups. Subjects with ADHD had higher intra-individual variability, reflected by both sigma and tau, but the rate of decrease in variability with age was similar to that of the controls. CONCLUSION These results suggest that subjects with ADHD, ASD and controls differ in the rate at which intra-individual variability decreases during development, and support the idea that intra-individual variability may be a marker of neural development, mimicking the neurodevelopmental changes in these disorders.
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Affiliation(s)
- Janna van Belle
- NICHE Lab, Department of Psychiatry, Rudolf Magnus Magnus Brain Centre, University Medical Centre Utrecht, Utrecht, The Netherlands
| | - Branko M van Hulst
- NICHE Lab, Department of Psychiatry, Rudolf Magnus Magnus Brain Centre, University Medical Centre Utrecht, Utrecht, The Netherlands
| | - Sarah Durston
- NICHE Lab, Department of Psychiatry, Rudolf Magnus Magnus Brain Centre, University Medical Centre Utrecht, Utrecht, The Netherlands
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De la Torre GG, Barroso JM, León-Carrión J, Mestre JM, Bozal RG. Reaction Time and Attention: Toward a New Standard in the Assessment of ADHD? A Pilot Study. J Atten Disord 2015; 19:1074-82. [PMID: 23269195 DOI: 10.1177/1087054712466440] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
UNLABELLED This pilot study shows results of an experiment comparing reaction times (RTs) and attentional performance between an ADHD group of 30 children and 30 controls, both Spanish speaking. The experiment was carried out using the Seville computerized neuropsychological battery (SNB). OBJECTIVE This study had two goals: One was to test sensitivity of SNB for attention deficits in ADHD and the second was to detect differences in RTs between ADHD and controls. Possible explanations and implications of such differences are also discussed. METHOD SNB computerized system was used to assess RTs and accuracy, and alternate forms of continuous performance task were used. RESULTS Results showed high sensitivity of some of the SNB tests, especially cancellation tests. RTs were significantly different between groups. CONCLUSION SNB represents a helpful tool for detection of attention deficits, and RT indices represent the most significant variable in differentiation of both groups studied.
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146
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Henríquez-Henríquez M, Villarroel L, Henríquez H, Zamorano F, Rothhammer F, Aboitiz F. Intratask Variability As a Correlate for DRD4 and SLC6A3 Variants: A Pilot Study in ADHD. J Atten Disord 2015; 19:987-96. [PMID: 22930791 DOI: 10.1177/1087054712455844] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
UNLABELLED Behavioral variability may be an ADHD key feature. Currently used ex-Gaussian/Fast Fourier Transform analyses characterize general distribution and oscillatory/rhythmic components of performance but are unable to demonstrate slow cumulative changes over entire tasks. OBJECTIVE To explore how performance of ADHD children and unaffected sibs gradually evolves in relation to genetic variants linked to ADHD. METHOD A total of 40 kids (20 ADHD-discordant sib pairs) between 8 and 13 years resolved a visual Go/NoGo with 10% NoGo probability. Variable number tandem repeats (VNTRs) at DRD4 and SLC6A3 were identified following standard protocols. Performance changes were assessed by linear/logistic mixed-effect models. RESULTS Models exploring SLC6A3 effects demonstrated less accentuated increments of response time (RT) (p = .046) and cumulative increments in the correct responses to "NoGo" (p = .00027) in 10R/10R participants. Models for DRD4 showed faster decline of correct responses to "Go" (p = .0078) in 2R/7R carriers. CONCLUSION Dynamical analysis of attention/inhibition measures may unravel new correlates to DRD4 and SLC6A3 variants.
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147
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Lundwall RA, Dannemiller JL. Genetic contributions to attentional response time slopes across repeated trials. BMC Neurosci 2015; 16:66. [PMID: 26471374 PMCID: PMC4608133 DOI: 10.1186/s12868-015-0201-3] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/16/2015] [Accepted: 09/29/2015] [Indexed: 01/09/2023] Open
Abstract
Background Attention provides vital contribution to everyday functioning, and deficits in attention feature in many psychological disorders. Improved understanding of attention may eventually be critical to early identification and treatment of attentional deficits. One step in that direction is to acquire a better understanding of genetic associations with performance on a task measuring reflexive (exogenous) visual attention. Reflexive attention is an important component of overall attention because (along with voluntary selective attention) it participates in determining where attention is allocated and how susceptible to distractors the subject might be. The task that we used involves the presentation of a target that is preceded by one of several different types of cues (none, double, or single, either ipsilateral or contralateral to where the target subsequently appears). We used several different outcome measures depending on the cue presented. We have previously studied the relationship between selected genes and mean response time (RT). Here we report on the contributions of genetic markers to RT increases or decreases over the course of the task (linear trend in RT slope). Results Specifically, we find that RT slope for a variety of reflexive attention outcome measures is dependent on DAT1 genotype. DRD4 was near significant for one outcome measure in the final (best) model. APOE, COMT, and DBH were not significant in any models. Conclusions It is especially interesting that genotype predicts linear changes in RT across trials (and not just mean differences or moment-to-moment variability). DAT1 is a gene that produces a protein involved in the transport of dopamine from the synapse. To our knowledge, this is the first study that has associated neurotransmitter genotypes with RT slope on a reflexive attention experiment. The direction of these effects is consistent with genetic risk for attention deficit hyperactivity disorder (ADHD). That is, those with two risk alleles for ADHD (6R/6R on the DAT1 intron 8 VNTR) either got slower as the task progressed or had the least improvement. Those with no risk alleles (5R/5R) had the most improvement in RT as the task progressed.
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Affiliation(s)
| | - James L Dannemiller
- Department of Psychology, MS-25, Rice University, P. O. Box 1892, Houston, TX, 77251-1892, USA.
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148
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Fasmer OB, Mjeldheim K, Førland W, Hansen AL, Dilsaver S, Oedegaard KJ, Berle JØ. Motor Activity in Adult Patients with Attention Deficit Hyperactivity Disorder. Psychiatry Investig 2015; 12:474-82. [PMID: 26508958 PMCID: PMC4620304 DOI: 10.4306/pi.2015.12.4.474] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/15/2014] [Revised: 03/18/2015] [Accepted: 03/18/2015] [Indexed: 11/23/2022] Open
Abstract
OBJECTIVE Hyperactivity is a core symptom of attention-deficit hyperactivity disorder (ADHD), but limited information is available on analysis of activity patterns in this disorder. The aim of the study was to analyze motor activity during daily living in adult patients with ADHD. METHODS Patients (n=76) from the private psychiatric practice of two of the authors were recruited, and were compared to patients with other psychiatric disorders and to normal controls. Actigraphs were used to record motor activity for six days, with one minute intervals, and data were analysed using linear and non-linear mathematical methods. RESULTS For short recording periods (300 minutes) the activity levels of ADHD patients do not differ from normal controls, but the autocorrelation (lag 1) is lower and Fourier analysis shows higher power in the high frequency range, corresponding to the period from 2-8 min. During recordings for six days there are no significant differences between ADHD patients and the control groups. The combined and inattentive subgroups differ only in the six days recordings. The Fourier analyses show that the combined type has lower power in the high frequency range, corresponding to the period from 4-8 hours, and in the analysis of rhythms the intra-daily variability is lower, compared to the inattentive type. CONCLUSION Adult ADHD patients do not show evidence of hyperactivity, but have levels of activity similar to normal controls. However, on several measures ADHD patients display altered activity patterns, indicating that the regulation of motor activity in this disorder is different from controls.
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Affiliation(s)
- Ole Bernt Fasmer
- Division of Psychiatry, Haukeland University Hospital, Bergen, Norway
- Department of Clinical Medicine, Section for Psychiatry, University of Bergen, Bergen, Norway
- K.G. Jebsen Centre for Research on Neuropsychiatric Disorders, Bergen, Norway
| | | | | | - Anita L. Hansen
- Department of Psychosocial Science, University of Bergen, Bergen, Norway/Centre for Research and Education in Forensic Psychiatry, Haukeland University Hospital, Bergen, Norway
| | | | - Ketil J. Oedegaard
- Division of Psychiatry, Haukeland University Hospital, Bergen, Norway
- Department of Clinical Medicine, Section for Psychiatry, University of Bergen, Bergen, Norway
- K.G. Jebsen Centre for Research on Neuropsychiatric Disorders, Bergen, Norway
| | - Jan Øystein Berle
- Division of Psychiatry, Haukeland University Hospital, Bergen, Norway
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149
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Characterizing individual differences in reward sensitivity from the brain networks involved in response inhibition. Neuroimage 2015; 124:287-299. [PMID: 26343318 DOI: 10.1016/j.neuroimage.2015.08.067] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/28/2015] [Revised: 08/07/2015] [Accepted: 08/30/2015] [Indexed: 11/22/2022] Open
Abstract
A "disinhibited" cognitive profile has been proposed for individuals with high reward sensitivity, characterized by increased engagement in goal-directed responses and reduced processing of negative or unexpected cues, which impairs adequate behavioral regulation after feedback in these individuals. This pattern is manifested through deficits in inhibitory control and/or increases in RT variability. In the present work, we aimed to test whether this profile is associated with the activity of functional networks during a stop-signal task using independent component analysis (ICA). Sixty-one participants underwent fMRI while performing a stop-signal task, during which a manual response had to be inhibited. ICA was used to mainly replicate the functional networks involved in the task (Zhang and Li, 2012): two motor networks involved in the go response, the left and right fronto-parietal networks for stopping, a midline error-processing network, and the default-mode network (DMN), which was further subdivided into its anterior and posterior parts. Reward sensitivity was mainly associated with greater activity of motor networks, reduced activity in the midline network during correct stop trials and, behaviorally, increased RT variability. All these variables explained 36% of variance of the SR scores. This pattern of associations suggests that reward sensitivity involves greater motor engagement in the dominant response, more distractibility and reduced processing of salient or unexpected events, which may lead to disinhibited behavior.
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150
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Kucyi A, Hove MJ, Biederman J, Van Dijk KR, Valera EM. Disrupted functional connectivity of cerebellar default network areas in attention-deficit/hyperactivity disorder. Hum Brain Mapp 2015; 36:3373-86. [PMID: 26109476 PMCID: PMC4562390 DOI: 10.1002/hbm.22850] [Citation(s) in RCA: 63] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/27/2015] [Revised: 05/11/2015] [Accepted: 05/12/2015] [Indexed: 01/21/2023] Open
Abstract
Attention-deficit/hyperactivity disorder (ADHD) is increasingly understood as a disorder of spontaneous brain-network interactions. The default mode network (DMN), implicated in ADHD-linked behaviors including mind-wandering and attentional fluctuations, has been shown to exhibit abnormal spontaneous functional connectivity (FC) within-network and with other networks (salience, dorsal attention and frontoparietal) in ADHD. Although the cerebellum has been implicated in the pathophysiology of ADHD, it remains unknown whether cerebellar areas of the DMN (CerDMN) exhibit altered FC with cortical networks in ADHD. Here, 23 adults with ADHD and 23 age-, IQ-, and sex-matched controls underwent resting state fMRI. The mean time series of CerDMN areas was extracted, and FC with the whole brain was calculated. Whole-brain between-group differences in FC were assessed. Additionally, relationships between inattention and individual differences in FC were assessed for between-group interactions. In ADHD, CerDMN areas showed positive FC (in contrast to average FC in the negative direction in controls) with widespread regions of salience, dorsal attention and sensorimotor networks. ADHD individuals also exhibited higher FC (more positive correlation) of CerDMN areas with frontoparietal and visual network regions. Within the control group, but not in ADHD, participants with higher inattention had higher FC between CerDMN and regions in the visual and dorsal attention networks. This work provides novel evidence of impaired CerDMN coupling with cortical networks in ADHD and highlights a role of cerebro-cerebellar interactions in cognitive function. These data provide support for the potential targeting of CerDMN areas for therapeutic interventions in ADHD.
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Affiliation(s)
- Aaron Kucyi
- Deparment of PsychiatryHarvard Medical SchoolBostonMassachusetts
- Department of PsychiatryMassachusetts General HospitalCharlestownMassachusetts
| | - Michael J. Hove
- Deparment of PsychiatryHarvard Medical SchoolBostonMassachusetts
- Department of PsychiatryMassachusetts General HospitalCharlestownMassachusetts
| | - Joseph Biederman
- Deparment of PsychiatryHarvard Medical SchoolBostonMassachusetts
- Department of PsychiatryMassachusetts General HospitalCharlestownMassachusetts
| | - Koene R.A. Van Dijk
- Department of Radiology, Athinoula a. Martinos Center for Biomedical ImagingMassachusetts General HospitalCharlestownMassachusetts
- Department of Psychology, Harvard UniversityCenter for Brain ScienceCambridgeMassachusetts
| | - Eve M. Valera
- Deparment of PsychiatryHarvard Medical SchoolBostonMassachusetts
- Department of PsychiatryMassachusetts General HospitalCharlestownMassachusetts
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