Journal
CEREBRAL CORTEX
Volume 24, Issue 8, Pages 1996-2008Publisher
OXFORD UNIV PRESS INC
DOI: 10.1093/cercor/bht050
Keywords
anterior cingulate cortex; attention; cognitive control; prefrontal cortex; theta oscillations
Categories
Funding
- Canadian Institutes of Health Research [CIHR-210428]
- Natural Sciences and Engineering Research Council of Canada (NSERC)
- Ontario Ministry of Economic Development and Innovation (MEDI) [ER11-08-140]
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The capacity to rapidly adjust behavioral strategies according to changing task demands is closely associated with coordinated activity in lateral and medial prefrontal cortices. Subdivisions within prefrontal cortex are implicated to encode attentional task sets and to update changing task rules, particularly when changing task demands require top-down control. Here, we tested whether these top-down processes precede stimulus processing and constitute a preparatory attentional state that functionally couples with parietal cortex. We examined this functional coupling by recording from intracranial EEG electrodes in macaques during performance of a task-switching paradigm that separates task performance that is based on controlled top-down guidance from automatic, stimulus-triggered processing modes. We identify a prefrontal-parietal network that phase synchronizes at 5-10 Hz, particularly during preparatory states that indicate top-down controlled task-processing modes. Phase relations in the network suggest that medial and lateral prefrontal cortices synchronize bidirectionally, with medial prefrontal cortex showing a phase-lead relative to left parietal recorded 5- to 10-Hz preparatory signals. These findings reveal a 5- to 10-Hz coordinated, long-range fronto-parietal network prior to actual task-relevant stimulus processing, particularly when subjects engage in controlled task processing modes.
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