Converging intracranial markers of conscious access.
- Gaillard, Raphaël
- Dehaene, Stanislas
- Adam, Claude
- Clémenceau, Stéphane
- Hasboun, Dominique
- Baulac, Michel
- Cohen, Laurent D.
- Naccache, Lionel
DOIAbstract
International audienceWe compared conscious and nonconscious processing of briefly flashed words using a visual masking procedure while recording intracranial electroencephalogram (iEEG) in ten patients. Nonconscious processing of masked words was observed in multiple cortical areas, mostly within an early time window (<300 ms), accompanied by induced gamma-band activity, but without coherent long-distance neural activity, suggesting a quickly dissipating feedforward wave. In contrast, conscious processing of unmasked words was characterized by the convergence of four distinct neurophysiological markers: sustained voltage changes, particularly in prefrontal cortex, large increases in spectral power in the gamma band, increases in long-dista...
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