Towards a system-level understanding of conscious vision: a study with electrocorticogram (ECoG) recording under continuous flash suppression (CFS).
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1
Monash University, School of Psychology and Psychiatry, Australia
When physical inputs to the visual system are dissociated from subjective conscious perception under various visual illusions, such as binocular rivalry, previous studies have shown that activities of the single neurons in higher visual areas correlates with the conscious perception while those in lower visual areas correlates more with the physical inputs. However, how the visual system as a whole integrates information from the low- to high-level visual areas and generates conscious vision remains poorly understood. To understand the system-level dynamics underlying conscious vision, we recorded the electrocorticogram (ECoG) from 64-128 channels implanted in various cortical regions in monkeys and humans while subjects performed a detection task under continuous flash suppression (CFS). Under CFS, an otherwise highly salient visual object presented to one eye becomes invisible due to a rapid sequence of flashes presented to the other eye. Depending on the strength of suppression, we found that reaction times (RTs) can be rendered highly variable across trials and that longer suppression trials were associated with the strong evoked power at low-frequency bands in the early visual areas as well as in the prefrontal cortex. We will also present some preliminary results on the inter-areal interaction using Granger causality analysis. Our preliminary results are consistent with a view that conscious vision is dynamically regulated at the system level through interaction among various cortical areas at various frequencies.
Keywords:
Perception,
Consciousness,
Visual Processing,
continuous flash suppression,
ECoG
Conference:
ACNS-2012 Australasian Cognitive Neuroscience Conference, Brisbane, Australia, 29 Nov - 2 Dec, 2012.
Presentation Type:
Symposium Presentation
Topic:
Sensation and Perception
Citation:
Tsuchiya
N
(2012). Towards a system-level understanding of conscious vision: a study with electrocorticogram (ECoG) recording under continuous flash suppression (CFS)..
Conference Abstract:
ACNS-2012 Australasian Cognitive Neuroscience Conference.
doi: 10.3389/conf.fnhum.2012.208.00007
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Received:
24 Oct 2012;
Published Online:
26 Oct 2012.
*
Correspondence:
Dr. Naotsugu Tsuchiya, Monash University, School of Psychology and Psychiatry, Melbourne, Australia, naotsugu.tsuchiya@monash.edu