Alpha fluctuations regulate the accrual of visual information to awareness

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• dc.contributor.author Torralba Cuello, Mireia
• dc.contributor.author Drew, Alice
• dc.contributor.author Sabaté San José, Alba
• dc.contributor.author Morís Fernández, Luis, 1982-
• dc.contributor.author Soto-Faraco, Salvador, 1970-
• dc.date.accessioned 2023-03-01T13:51:49Z
• dc.date.available 2023-03-01T13:51:49Z
• dc.date.issued 2022
• dc.description.abstract Endogenous brain processes play a paramount role in shaping up perceptual phenomenology. This is illustrated by the alternations experienced by humans (and other animals) when watching perceptually ambiguous, static images. We hypothesised that endogenous alpha fluctuations in the visual cortex pace the accumulation of sensory information leading to perceptual outcomes. Here, we addressed this hypothesis using binocular rivalry combined with visual entrainment and electroencephalography in humans (64 female, 53 male). The results revealed a correlation between the individual frequency of alpha oscillations in the occipital cortex and perceptual alternation rates experienced during binocular rivalry. In subsequent experiments we show that regulating endogenous brain activity via rhythmic entrainment produced corresponding changes in perceptual alternation rate. These changes were observed only in the alpha range but not at lower entrainment frequencies, and were much reduced when using arrhythmic stimulation. Additionally, entraining at frequencies above the alpha range did not result in speeding up perceptual alternation rates. Overall, these findings support the notion that visual information is accumulated via alpha cycles to promote the emergence of conscious perceptual representations. We suggest that models of binocular rivalry incorporating posterior alpha as a pacemaker can provide an important advance in the comprehension of the dynamics of visual awareness.
• dc.description.sponsorship This research was supported by the Ministerio de Ciencia e Innovación (PID2019-108531GB-I00 AEI/FEDER), AGAUR Generalitat de Catalunya (2017 SGR 1545). This project has been co-funded with 50% by the European Regional Development Fund under the framework of the FEDER Operative Programme for Catalunya 2014–2020, with a grant of 1,527,637.88€.
• dc.format.mimetype application/pdf
• dc.identifier.citation Torralba Cuello M, Drew A, Sabaté San José A, Morís Fernández L, Soto-Faraco S. Alpha fluctuations regulate the accrual of visual information to awareness. Cortex. 2022;147:58-71. DOI: 10.1016/j.cortex.2021.11.017
• dc.identifier.doi http://dx.doi.org/10.1016/j.cortex.2021.11.017
• dc.identifier.issn 0010-9452
• dc.identifier.uri http://hdl.handle.net/10230/55999
• dc.language.iso eng
• dc.publisher Elsevier
• dc.relation.ispartof Cortex. 2022;147:58-71.
• dc.relation.isreferencedby https://osf.io/mpvnq/?view_only=fef7c8566c7c4d83a89a08adcd738bce
• dc.relation.isreferencedby https://ars.els-cdn.com/content/image/1-s2.0-S0010945221003774-mmc1.pdf
• dc.relation.projectID info:eu-repo/grantAgreement/ES/2PE/PID2019-108531GB-I00
• dc.rights © 2021 The Authors. Published by Elsevier Ltd. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).
• dc.rights.accessRights info:eu-repo/semantics/openAccess
• dc.rights.uri http://creativecommons.org/licenses/by-nc-nd/4.0/
• dc.subject.keyword BR
• dc.subject.keyword binocular rivalry
• dc.subject.keyword NAR
• dc.subject.keyword natural alternation rate
• dc.subject.keyword EEG
• dc.subject.keyword electroencephalography
• dc.subject.keyword IAF
• dc.subject.keyword individual alpha frequency
• dc.subject.keyword SSVEP
• dc.subject.keyword steady-state visual evoked potentials
• dc.subject.keyword XCOH
• dc.subject.keyword cross-coherence
• dc.subject.keyword TOST
• dc.subject.keyword two one sided tests
• dc.title Alpha fluctuations regulate the accrual of visual information to awareness
• dc.type info:eu-repo/semantics/article
• dc.type.version info:eu-repo/semantics/publishedVersion