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An fMRI analysis of dorsolateral prefrontal cortex's involvement in attentional control
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An fMRI analysis of dorsolateral prefrontal cortex's involvement in attentional control
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An fMRI analysis of dorsolateral prefrontal cortex's involvement in attentional control
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Dissertation
An fMRI analysis of dorsolateral prefrontal cortex's involvement in attentional control
2002
Overview
Although dorsolateral prefrontal cortex's (DLPFC) involvement in top-down attentional control is clear, the factors that govern DLPFC's involvement in control are not yet fully understood. Thus, the goal of the present work was to examine the factors governing DLPFC's involvement in attentional control. Our work specifically focused on the impact of task-irrelevant information on DLPFC's involvement in control. Not only did we demonstrate the ability of various aspects of task-irrelevant information to increase DLPFC's involvement in control (i.e., relatedness to the task at hand, conflict, degree of activation), but we also suggested a possible unifying explanation. The presence of task-irrelevant information increases DLPFC's involvement in control to the extent that it is capable of competing for priority in processing. The present work also addressed the proposal that DLPFC and anterior cingulated cortex (ACC) play complementary roles in control. Through an analysis of practice-related effects, the present work provided support for the notion that DLPFC is involved in implementing control while ACC is involved in response-related processes. In addition, our examination of various aspects of task-irrelevant information (i.e., conflict, task-relatedness) suggested a possible functional differentiation within ACC, with the posterior rostral zone being more involved in response selection and the anterior rostral zone being more involved in conflict monitoring.
Publisher
ProQuest Dissertations & Theses
Subject
ISBN
9780493901657, 0493901655
