Brain dynamics underlying the nonlinear threshold for access to consciousness. - Archive ouverte HAL Access content directly
Journal Articles PLoS Biology Year : 2007

Brain dynamics underlying the nonlinear threshold for access to consciousness.

(1) , (2) , (1, 3)
1
2
3

Abstract

When a flashed stimulus is followed by a backward mask, subjects fail to perceive it unless the target-mask interval exceeds a threshold duration of about 50 ms. Models of conscious access postulate that this threshold is associated with the time needed to establish sustained activity in recurrent cortical loops, but the brain areas involved and their timing remain debated. We used high-density recordings of event-related potentials (ERPs) and cortical source reconstruction to assess the time course of human brain activity evoked by masked stimuli and to determine neural events during which brain activity correlates with conscious reports. Target-mask stimulus onset asynchrony (SOA) was varied in small steps, allowing us to ask which ERP events show the characteristic nonlinear dependence with SOA seen in subjective and objective reports. The results separate distinct stages in mask-target interactions, indicating that a considerable amount of subliminal processing can occur early on in the occipito-temporal pathway (<250 ms) and pointing to a late (>270 ms) and highly distributed fronto-parieto-temporal activation as a correlate of conscious reportability.
Fichier principal
Vignette du fichier
journal.pbio.0050260.pdf (923.77 Ko) Télécharger le fichier
Origin : Publisher files allowed on an open archive
Loading...

Dates and versions

inserm-00707871 , version 1 (13-06-2012)

Identifiers

Cite

Antoine del Cul, Sylvain Baillet, Stanislas Dehaene. Brain dynamics underlying the nonlinear threshold for access to consciousness.. PLoS Biology, 2007, 5 (10), pp.e260. ⟨10.1371/journal.pbio.0050260⟩. ⟨inserm-00707871⟩
205 View
246 Download

Altmetric

Share

Gmail Facebook Twitter LinkedIn More