Increased anterior brain activation to correct responses on high-conflict Stroop task in obsessive-compulsive disorder.
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An abnormally increased activation in anterior brain networks, accompanied by normal task performance, has been reported in studies on biological mechanisms of obsessive-compulsive disorder (OCD). We test a hypothesis, that this phenomenon, deemed specific to OCD, will be compromised by a very difficult task, which may lead to reduced cortical information processing and erroneous performance, as found in other disorders such as schizophrenia.We designed a new variant of high-conflict Stroop-word-color interference task (Stroop-WCIT) with each incongruent (INC) trial preceded by multiple congruent trials. Event-related potentials (ERPs) were acquired from subjects with OCD and case-matched healthy controls (C). We analyzed ERPs elicited by correct responses to conflict-related INC trials.Our hypothesis found no support. Although the anterior ERPs N200, a negative component within 140-300 ms latency window, was significantly abnormally increased in OCD subjects, their performance accuracy remained normal.Current findings suggest an enhanced adaptive top-down control in OCD mediated by the prefrontal lateral and dorsal anterior cingulate networks.Further studies are warranted to test the hypothesis that increased activity within the anterior network for top-down inhibitory control in OCD may be a part of an adaptive compensatory neural mechanism.Copyright © 2010 International Federation of Clinical Neurophysiology. Published by Elsevier Ireland Ltd. All rights reserved.
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Adult
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Brain Mapping
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Brain Waves
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Electroencephalography
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Evoked Potentials
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Female
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Frontal Lobe
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Humans
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Male
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Middle Aged
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Nerve Net
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Neural Inhibition
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Obsessive-Compulsive Disorder
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Stroop Test
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Young Adult
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