Induced gamma-band oscillations correlate with awareness in hemianopic patient GY.

Neuropsychologia
Aaron SchurgerCatherine Tallon-Baudry

Abstract

In normal vision gamma oscillations are involved in object perception, are modulated by attention, and have been linked to awareness by way of their putative role in perceptual integration, arguably as a mechanism for synchronizing activity in separate neural assemblies. We tested the hypothesis that the presence of gamma oscillations (approximately 30-80 Hz) signal the entry of a neural representation into awareness (as indexed by direct report), while attempting to control for other measures of neural information processing such as discrimination accuracy and reaction time. Hemianopic patient GY sometimes reports an awareness "that something happened" in his blind visual hemifield, in response to stimuli of sufficiently high contrast, although he may deny "seeing" anything. At lower contrast levels GY denies any awareness, but may continue to exhibit greater-than-chance accuracy (blindsight). Using a near-threshold level of contrast offers a unique way to test hypotheses concerning correlates of perceptual awareness, since GY's accuracy on certain tasks is independent of awareness. We tested GY on an orientation-discrimination task using stationary stimuli at a fixed near-threshold level of contrast, to which GY sometimes res...Continue Reading

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Citations

Jul 2, 2009·Experimental Brain Research·Alan Cowey
Dec 12, 2012·Experimental Brain Research·Alan CoweyAmanda Ellison
Oct 16, 2008·Journal of Cognitive Neuroscience·Maximilien ChaumonCatherine Tallon-Baudry
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Apr 8, 2015·Proceedings of the National Academy of Sciences of the United States of America·Aaron SchurgerStanislas Dehaene
Mar 19, 2013·Neuropsychologia·Florence Campana, Catherine Tallon-Baudry
Apr 9, 2008·Neuropsychologia·Aaron SchurgerCatherine Tallon-Baudry
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