Open AccessDissociation of response inhibition and performance monitoring in the stop signal task using event‐related fMRI
Author(s) -
Chevrier Andre D.,
Noseworthy Michael D.,
Schachar Russell
Publication year - 2007
Publication title -
human brain mapping
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.005
H-Index - 191
eISSN - 1097-0193
pISSN - 1065-9471
DOI - 10.1002/hbm.20355
Subject(s) - stop signal , functional magnetic resonance imaging , neuroscience , psychology , anterior cingulate cortex , go/no go , response inhibition , prefrontal cortex , inferior frontal gyrus , neural substrate , cognition , computer science , telecommunications , machine learning , latency (audio)
We examined the neural substrate of motor response inhibition and performance monitoring in the stop signal task (SST) using event‐related functional magnetic resonance imaging (fMRI). The SST involves a go task and the occasional requirement to stop the go response. We posit that both the go and the stop phases of the SST involve components of inhibition and performance monitoring. The goal of this study was to determine whether inhibition and performance monitoring during go and stop phases of the task activated different networks. We isolated go‐phase activities underlying response withholding, monitoring, and sensorimotor processing and contrasted these with successful inhibition to identify the substrate of response inhibition. Error detection activity was isolated using trials in which a stop signal appeared but the response was executed. These trials were modeled as a hand‐specific go trial followed by error processing. Cognitive go‐phase processes included response withholding and monitoring and activated right prefrontal and midline networks. Response withdrawal additionally activated right inferior frontal gyrus and basal ganglia (caudate). Error detection invoked by failed inhibition activated dorsal anterior cingulate cortex (dACC) and right middle frontal Brodmann's area 9. Our results confirm that there are distinct aspects of inhibition and performance monitoring functions which come into play at various phases within a given trial of the SST, and that these are separable using fMRI. Hum Brain Mapp, 2007. © 2007 Wiley‐Liss, Inc.