Converging intracranial markers of conscious access. - Archive ouverte HAL Access content directly
Journal Articles PLoS Biology Year : 2009

Converging intracranial markers of conscious access.

(1, 2) , (1, 3, 4) , (5) , (5) , (5, 6) , (5, 6) , (1, 5, 6) , (1, 5, 6)
1
2
3
4
5
6

Abstract

We 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-distance phase synchrony in the beta range, and increases in long-range Granger causality. We argue that all of those measures provide distinct windows into the same distributed state of conscious processing. These results have a direct impact on current theoretical discussions concerning the neural correlates of conscious access.
Fichier principal
Vignette du fichier
pbio_1_.1000061.pdf (1.73 Mo) Télécharger le fichier
Origin : Publisher files allowed on an open archive
Loading...

Dates and versions

cea-00423936 , version 1 (13-10-2009)

Identifiers

Cite

Raphaël Gaillard, Stanislas Dehaene, Claude Adam, Stéphane Clémenceau, Dominique Hasboun, et al.. Converging intracranial markers of conscious access.. PLoS Biology, 2009, 7 (3), pp.e61. ⟨10.1371/journal.pbio.1000061⟩. ⟨cea-00423936⟩
339 View
298 Download

Altmetric

Share

Gmail Facebook Twitter LinkedIn More