Journal
PSYCHIATRY RESEARCH-NEUROIMAGING
Volume 154, Issue 3, Pages 233-240Publisher
ELSEVIER IRELAND LTD
DOI: 10.1016/j.pscychresns.2006.09.002
Keywords
serial reaction time; striatum; imaging; obsessive-compulsive disorder
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Trichotillomania (TTM) may be related to obsessive-compulsive disorder (OCD) and other neuropsychiatric conditions characterized by cortico-striatal dysfunction. Functional imaging studies of OCD using an implicit learning task have found abnormalities in striatal and hippocampal activation. The current study investigated whether similar abnormalities occur in TTM. Functional MRI and the serial reaction time (SRT) task were used to assess striatal and hippocampal activation during implicit sequence learning in TTM and healthy control (HQ subjects. The results for 20 age- and education-matched participants (10 TTM, 10 HQ are reported. In comparison with HC participants, those with TTM exhibited no significant differences in implicit learning, or in activation within the striatum, hippocampus, or other brain regions. The current findings do not provide evidence for cortico-striatal dysfunction in TTM. Future studies directly comparing OCD and TTM subjects are warranted to confirm the specificity of abnormal striatal and hippocampal findings during implicit sequence learning in OCD. (C) 2006 Elsevier Ireland Ltd. All rights reserved.
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