期刊
NEUROIMAGE
卷 101, 期 -, 页码 337-350出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.neuroimage.2014.07.024
关键词
Attention; Consciousness; Gamma; P3; Task relevance; Visual awareness
资金
- Kavli Institute for Brain and Mind (KIBM Innovative Research Award)
- National Institutes of Health [2 R01 EY016984-35, 1P50MH86385]
- National Science Foundation [BCS-1029084]
- Division Of Behavioral and Cognitive Sci
- Direct For Social, Behav & Economic Scie [1029084] Funding Source: National Science Foundation
A primary goal in cognitive neuroscience is to identify neural correlates of conscious perception (NCC). By contrasting conditions in which subjects are aware versus unaware of identical visual stimuli, a number of candidate NCCs have emerged; among them are induced gamma band activity in the EEG and the P3 event-related potential. In most previous studies, however, the critical stimuli were always directly relevant to the subjects' task, such that aware versus unaware contrasts may well have included differences in post-perceptual processing in addition to differences in conscious perception per se. Here, in a series of EEG experiments, visual awareness and task relevance were manipulated independently. Induced gamma activity and the P3 were absent for task-irrelevant stimuli regardless of whether subjects were aware of such stimuli. For task-relevant stimuli, gamma and the P3 were robust and dissociable, indicating that each reflects distinct post-perceptual processes necessary for carrying-out the task but not for consciously perceiving the stimuli. Overall, this pattern of results challenges a number of previous proposals linking gamma band activity and the P3 to conscious perception. (C) 2014 Elsevier Inc. All rights reserved.
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