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Neural electrophysiological correlates of detection and identification awareness
Stockholm University, Faculty of Social Sciences, Department of Psychology, Perception and psychophysics.ORCID iD: 0000-0003-4531-4313
Stockholm University, Faculty of Social Sciences, Department of Psychology, Perception and psychophysics.ORCID iD: 0000-0002-9932-8924
Number of Authors: 32023 (English)In: Cognitive, Affective, & Behavioral Neuroscience, ISSN 1530-7026, E-ISSN 1531-135X, Vol. 23, p. 1303-1321Article in journal (Refereed) Published
Abstract [en]

Humans have conscious experiences of the events in their environment. Previous research from electroencephalography (EEG) has shown visual awareness negativity (VAN) at about 200 ms to be a neural correlate of consciousness (NCC). However, when considering VAN as an NCC, it is important to explore which particular experiences are associated with VAN. Recent research proposes that VAN is an NCC of lower-level experiences (detection) rather than higher-level experiences (identification). However, previous results are mixed and have several limitations. In the present study, the stimulus was a ring with a Gabor patch tilting either left or right. On each trial, subjects rated their awareness on a three-level perceptual awareness scale that captured both detection (something vs. nothing) and identification (identification vs. something). Separate staircases were used to adjust stimulus opacity to the detection threshold and the identification threshold. Bayesian linear mixed models provided extreme evidence (BF10 = 131) that VAN was stronger at the detection threshold than at the identification threshold. Mean VAN decreased from -2.12 microV [-2.86, -1.42] at detection to -0.46 microV [-0.79, -0.11] at identification. These results strongly support the claim that VAN is an NCC of lower-level experiences of seeing something rather than of higher-level experiences of specific properties of the stimuli. Thus, results are consistent with recurrent processing theory in that phenomenal visual consciousness is reflected by VAN. Further, results emphasize that it is important to consider the level of experience when searching for NCC.

Place, publisher, year, edition, pages
Springer Nature, 2023. Vol. 23, p. 1303-1321
Keywords [en]
consciousness, neural correlates, ERP
National Category
Applied Psychology
Research subject
Psychology
Identifiers
URN: urn:nbn:se:su:diva-221731DOI: 10.3758/s13415-023-01120-5ISI: 001056996800001PubMedID: 37656374Scopus ID: 2-s2.0-85169800174OAI: oai:DiVA.org:su-221731DiVA, id: diva2:1800910
Note

This work was supported by a grant to Stefan Wiens from Marianne and Marcus Wallenberg Foundation (MMW 2019–0102).

Available from: 2023-09-28 Created: 2023-09-28 Last updated: 2024-01-30Bibliographically approved

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Wiens, StefanAndersson, Annika

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