Brain dynamics underlying the nonlinear threshold for access to consciousness.
In: ISSN: 1544-9173, 2007
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Zugriff:
International audience ; 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.
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Brain dynamics underlying the nonlinear threshold for access to consciousness.
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Autor/in / Beteiligte Person: | Del Cul, Antoine ; Baillet, Sylvain ; Dehaene, Stanislas ; Neuroimagerie cognitive - Psychologie cognitive expérimentale (UNICOG-U992) ; Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris Saclay (COmUE)-Institut National de la Santé et de la Recherche Médicale (INSERM) ; Laboratoire de neurosciences cognitives et d'imagerie cérébrale (LENA) ; Université Pierre et Marie Curie - Paris 6 (UPMC)-Centre National de la Recherche Scientifique (CNRS) ; Chaire Psychologie cognitive expérimentale ; Collège de France (CdF (institution)) ; Supported by INSERM, CEA, the Fondation pour la Recherche Médicale (AD), and a centennial fellowship from the McDonnell Foundation (SD) |
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Zeitschrift: | ISSN: 1544-9173, 2007 |
Veröffentlichung: | HAL CCSD ; Public Library of Science, 2007 |
Medientyp: | academicJournal |
DOI: | 10.1371/journal.pbio.0050260 |
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