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Hum Brain Mapp. 2015 Nov;36(11):4648-63. doi: 10.1002/hbm.22944. Epub 2015 Aug 19.

Impaired reward processing in the human prefrontal cortex distinguishes between persistent and remittent attention deficit hyperactivity disorder.

Author information

1
Department of Psychiatry, School of Medicine, Trinity College, the University of Dublin, Dublin 2, Ireland.
2
Regional Centre for Child and Youth Mental Health and Child Welfare, Faculty of Medicine, Norwegian University of Science and Technology, Trondheim, Norway.
3
Division of the Humanities and Social Sciences and Computation and Neural Systems Program, California Institute of Technology, Pasadena, California.
4
Centre for Advanced Medical Imaging (CAMI), St. James's Hospital/School of Medicine, Trinity College, the University of Dublin, Dublin 8, Ireland.
5
Department of Psychiatry, University Hospital, Otto Von Guericke University Magdeburg, Germany.

Abstract

Symptoms of attention deficit hyperactivity disorder (ADHD) in children often persist into adulthood and can lead to severe antisocial behavior. However, to-date it remains unclear whether neuro-functional abnormalities cause ADHD, which in turn can then provide a marker of persistent ADHD. Using event-related functional magnetic resonance imaging (fMRI), we measured blood oxygenation level dependent (BOLD) signal changes in subjects during a reversal learning task in which choice of the correct stimulus led to a probabilistically determined 'monetary' reward or punishment. Participants were diagnosed with ADHD during their childhood (N=32) and were paired with age, gender, and education matched healthy controls (N=32). Reassessment of the ADHD group as adults resulted in a split between either persistent (persisters, N=17) or remitted ADHDs (remitters, N=15). All three groups showed significantly decreased activation in the medial prefrontal cortex (PFC) and the left striatum during punished correct responses, however only remitters and controls presented significant psycho-physiological interaction between these fronto-striatal reward and outcome valence networks. Comparing persisters to remitters and controls showed significantly inverted responses to punishment (P<0.05, family-wise error corrected) in left PFC region. Interestingly, the decreased activation shown after punishment was located in different areas of the PFC for remitters compared with controls, suggesting that remitters might have learned compensation strategies to overcome their ADHD symptoms. Thus, fMRI helps understanding the neuro-functional basis of ADHD related behavior differences and differentiates between persistent and remittent ADHD.

KEYWORDS:

ADHD; denied reward response; fMRI; medial orbitofrontal cortex; prefrontal cortex; probabilistic error trial; reversal learning

PMID:
26287509
DOI:
10.1002/hbm.22944
[Indexed for MEDLINE]

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