A2 Refereed review article in a scientific journal
Event-related brain potential correlates of visual awareness
Authors: Koivisto M, Revonsuo A
Publisher: PERGAMON-ELSEVIER SCIENCE LTD
Publication year: 2010
Journal: Neuroscience and Biobehavioral Reviews
Journal name in source: NEUROSCIENCE AND BIOBEHAVIORAL REVIEWS
Journal acronym: NEUROSCI BIOBEHAV R
Number in series: 6
Volume: 34
Issue: 6
First page : 922
Last page: 934
Number of pages: 13
ISSN: 0149-7634
DOI: https://doi.org/10.1016/j.neubiorev.2009.12.002
Abstract
Electrophysiological recordings during visual tasks can shed light on the temporal dynamics of the subjective experience of seeing, visual awareness. This paper reviews studies on electrophysiological correlates of visual awareness operationalized as the difference between event-related potentials (ERPs) in response to stimuli that enter awareness and stimuli that do not. There are three candidates for such a correlate: enhancement of P1 around 100 ms, enhancement of early posterior negativity around 200 ms (visual awareness negativity, VAN), and enhancement of late positivity (LP) in the P3 time window around 400 ms. Review of studies using different manipulations of awareness suggests that VAN is the correlate of visual awareness that most consistently emerges across different manipulations of visual awareness. VAN emerges also relatively independent of manipulations of nonspatial attention, but seems to be dependent on spatial attention. The results suggest that visual awareness emerges about 200 ms after the onset of visual stimulation as a consequence of the activation of posterior occipito-temporal and parietal networks. (C) 2009 Elsevier Ltd. All rights reserved.
Electrophysiological recordings during visual tasks can shed light on the temporal dynamics of the subjective experience of seeing, visual awareness. This paper reviews studies on electrophysiological correlates of visual awareness operationalized as the difference between event-related potentials (ERPs) in response to stimuli that enter awareness and stimuli that do not. There are three candidates for such a correlate: enhancement of P1 around 100 ms, enhancement of early posterior negativity around 200 ms (visual awareness negativity, VAN), and enhancement of late positivity (LP) in the P3 time window around 400 ms. Review of studies using different manipulations of awareness suggests that VAN is the correlate of visual awareness that most consistently emerges across different manipulations of visual awareness. VAN emerges also relatively independent of manipulations of nonspatial attention, but seems to be dependent on spatial attention. The results suggest that visual awareness emerges about 200 ms after the onset of visual stimulation as a consequence of the activation of posterior occipito-temporal and parietal networks. (C) 2009 Elsevier Ltd. All rights reserved.
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