Disentangling conscious from unconscious cognitive processing with event-related EEG potentials

Abstract : By looking for properties of consciousness, cognitive neuroscience studies have dramatically enlarged the scope of unconscious cognitive processing. This emerging knowledge inspired the development of new approaches allowing clinicians to probe and disentangle conscious from unconscious cognitive processes in non-communicating brain-injured patients both in terms of behaviour and brain activity. This information is extremely valuable in order to improve diagnosis and prognosis in such patients both at acute and chronic settings. Reciprocally, the growing observations coming from such patients suffering from disorders of consciousness provide valuable constraints to theoretical models of consciousness. In this review we chose to illustrate these recent developments by focusing on brain signals recorded with EEG at bedside in response to auditory stimuli. More precisely, we present the respective EEG markers of unconscious and conscious processing of two classes of auditory stimuli (sounds and words). We show that in both cases, conscious access to the corresponding representation (e.g.: auditory regularity and verbal semantic content) share a similar neural signature (P3b and P600/LPC) that can be distinguished from unconscious processing occurring during an earlier stage (MMN and N400). We propose a two-stage serial model of processing and discuss how unconscious and conscious signatures can be measured at bedside providing relevant information for both diagnosis and prognosis of consciousness recovery. These two examples emphasize how fruitful can be the bidirectional approach exploring cognition in healthy subjects and in brain-damaged patients.
Liste complète des métadonnées

Littérature citée [88 références]  Voir  Masquer  Télécharger

http://hal.upmc.fr/hal-01580615
Contributeur : Benjamin Rohaut <>
Soumis le : vendredi 1 septembre 2017 - 18:15:46
Dernière modification le : jeudi 11 janvier 2018 - 06:25:43
Document(s) archivé(s) le : samedi 2 décembre 2017 - 14:29:18

Fichiers

Revue_Neurol_Pre-Print.pdf
Fichiers produits par l'(les) auteur(s)

Identifiants

Collections

UPMC | ICM

Citation

Benjamin Rohaut, Lionel Naccache. Disentangling conscious from unconscious cognitive processing with event-related EEG potentials. Revue Neurologique, Elsevier Masson, 2017, 〈10.1016/j.neurol.2017.08.001〉. 〈hal-01580615〉

Partager

Métriques

Consultations de la notice

248

Téléchargements de fichiers

118