Neural signatures of visual awareness independent of post-perceptual processing
Notice bibliographique
Résumé
Abstract What are the neural processes associated with perceptual awareness that are distinct from pre-conscious sensory encoding and post-perceptual processes such as reporting an experience? Here, we used electroencephalography (EEG) and a no-report visual masking paradigm with parametric manipulations of stimulus visibility to search for neural signatures associated with perceptual awareness independent from both early sensory processing and subsequent reporting. Specifically, we manipulated the time between stimuli and subsequent masks in a linear manner (i.e., 17ms, 33ms, 50ms, 67ms, and 83ms) such that observers’ awareness of the stimuli increased in a non-linear fashion (i.e., stimuli were never seen at the two shortest time intervals, always seen at the two longest intervals, and seen approximately 50% of the time at the intermediate interval). Moreover, we manipulated the task across blocks to create separate report and no-report conditions. Overall, we found one neural signal that was closely associated with perceptual awareness, independent from the task: a fronto-central event-related potential (ERP), from ∼250-300ms, that we refer to as the N2. In contrast, earlier ERP signals were linked with the linear manipulation of stimulus strength regardless of visibility, while later candidate signatures, such as P3b and temporal generalization of decoding, were present in the report condition but absent in the no-report condition suggesting a closer association with task performance than perceptual awareness. Taken together, these findings inform current debates regarding theories of consciousness and offer new avenues for exploring the neural mechanisms supporting conscious processing. Significance statement What differentiates conscious and unconscious processing in the brain? Here, we identify an electrophysiological signature of perceptual awareness using a combination of visual psychophysics and electroencephalography (EEG). In addition, we used a newly developed “no-report” paradigm, in which observers did not report anything about their perceptual experience to separate neural signals associated with consciousness from those associated with the act of reporting (i.e., memory, motor planning, etc.). Using this no-report paradigm was critical because several other candidate signatures of conscious processing were present when observers reported their experiences but completely disappeared when observers did not report their experiences. These findings open the door to future research interested in the neural mechanisms associated of conscious processing.
Récupéré en direct depuis OpenAlex et désinversé. Les résumés ne sont pas conservés dans cette base de données : les index inversés représentent 8,6 Go des 9,3 Go de texte de la base, et le serveur dispose de 13 Go libres.
Comment cette classification a été obtenuedéplier
Prédiction machine sur la base complète
Imitation des enseignantsNi prévalence calibrée, ni vérité terrain. Validation humaine à venir. Le volet Gemma est une étiquette directe du modèle pour chaque travail de la base, lue sur la notice réduite au titre. Le volet Codex est un classifieur appris des 10 348 étiquettes directes de Codex et calibré sur les taux pondérés de l'échantillon; les champs sans appui suffisant ne portent aucun appel Codex. Le mode candidate est l'union des deux volets; le consensus est leur intersection. Ces sorties portent le statut machine_predicted_unvalidated et ne sont pas des étiquettes humaines.
Scores du classifieur distillé par catégorie (deux têtes)
| Catégorie | Codex | Gemma |
|---|---|---|
| Métarecherche | 0,000 | 0,002 |
| Méta-épidémiologie (sens strict) | 0,000 | 0,000 |
| Méta-épidémiologie (sens large) | 0,000 | 0,000 |
| Bibliométrie | 0,000 | 0,000 |
| Études des sciences et des technologies | 0,000 | 0,000 |
| Communication savante | 0,000 | 0,000 |
| Science ouverte | 0,000 | 0,000 |
| Intégrité de la recherche | 0,000 | 0,000 |
| Charge utile insuffisante (le modèle a refusé de juger) | 0,001 | 0,000 |
Scores machine (provisoires)
Les deux têtes enseignantes du modèle étudiant, lues sur ce travail. Un score ordonne la base pour la relecture; il n'affirme jamais une catégorie, et le statut de validation accompagne chaque rangée tel quel.
Scores de référence d'un modèle non mature (critères de maturité non atteints, 7 itérations). Un score ordonne; il n'affirme jamais une catégorie.
score_only:v0-immature-baseline · tel quel depuis la passe de notation : score_only signifie que le nombre peut ordonner les travaux, et qu'aucune étiquette de catégorie n'en découleClassification
machine, non validéePrédiction automatique; un appel candidat d’une seule source (Gemma direct ou Codex distillé), pas un consensus.
Le détail, modèle par modèle et score par score, se trouve en fin de page sous « Comment cette classification a été obtenue ».