Attentional control of task and response in lateral and medial frontal cortex: Brain activity and reaction time distributions
Publication year
2009Source
Neuropsychologia, 47, 10, (2009), pp. 2089-2099ISSN
Publication type
Article / Letter to editor
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Organization
SW OZ DCC PL
SW OZ DCC CO
SW OZ BSI OLO
Former Organization
SW OZ NICI CO
Journal title
Neuropsychologia
Volume
vol. 47
Issue
iss. 10
Page start
p. 2089
Page end
p. 2099
Subject
DI-BCB_DCC_Theme 1: Language and Communication; PsycholinguisticsAbstract
It is unclear whether task conflict is reflected in the anterior cingulate cortex (ACC) or in more dorsal regions of the medial frontal cortex (MFC). When participants switch between tasks involving incongruent, congruent, and neutral stimuli, it is possible to examine both response conflict (incongruent vs. congruent) and task conflict (congruent vs. neutral). Here, we report an event-related functional magnetic resonance imaging (fMRI) study that examined which areas in frontal cortex, including MFC, are implicated in response conflict, task conflict, or both. Stimuli were incongruent and congruent arrow-word combinations, or arrows and words only in a neutral condition. Participants responded manually to the arrow or word. The task varied every second trial. The behavioral data revealed response conflict (incongruent > congruent) and task conflict (congruent > neutral) in mean reaction times and ex-Gaussian latency distribution components. The imaging data revealed activity in both the ACC and a more dorsal region in the MFC (the medial superior frontal gyrus) related to response conflict as well as task conflict. These conflict effects were observed independent of the task performed (arrow or word) or the trial type (repeat or switch). In lateral prefrontal cortex (LPFC), response conflict was associated with activity in ventral LPFC, whereas task conflict activated both ventral and dorsal regions. Thus, whereas the type of conflict (response vs. task) was differentiated in LPFC, no such differentiation was found in MFC, including the ACC. Models of ACC functioning may require modification to take account of these findings.
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- Academic publications [244084]
- Electronic publications [131085]
- Faculty of Social Sciences [30029]
- Open Access publications [105126]
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