When alertness fades: Drowsiness-induced visual dominance and oscillatory recalibration in audiovisual integration

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dc.article.number112562
dc.catalogadoryvc
dc.contributor.authorArtigas, Claudio
dc.contributor.authorMorales Torres, Ricardo
dc.contributor.authorRojas Thomas, Felipe
dc.contributor.authorVillena González, Mario
dc.contributor.authorRubio, Iván
dc.contributor.authorRamírez Benavides, Daniela
dc.contributor.authorBekinschtein, Tristán
dc.contributor.authorCampos Arteaga, Germán
dc.contributor.authorRodríguez B., Eugenio
dc.date.accessioned2025-06-25T22:14:05Z
dc.date.available2025-06-25T22:14:05Z
dc.date.issued2025
dc.description.abstractMultisensory integration allows the brain to align inputs from different sensory modalities, enhancing perception and behavior. However, transitioning into drowsiness, a state marked by decreased attentional control and altered cortical dynamics, offers a unique opportunity to examine adaptations in these multisensory processes. In this study, we investigated how drowsiness influences reaction times (RTs) and neural oscillations during audiovisual multisensory integration. Participants performed a task where auditory and visual stimuli were presented either in a coordinated manner or with temporal misalignment (visual-first or auditory-first uncoordinated conditions). Behavioral results showed that drowsiness slowed RTs overall but revealed a clear sensory dominance effect: visual-first uncoordination facilitated RTs compared to auditory-first uncoordination, reflecting vision's dominant role in recalibrating sensory conflicts. In contrast, RTs in coordinated conditions remained stable across alert and drowsy states, suggesting that multisensory redundancy compensates for reduced cortical integration during drowsiness. At the neural level, distinct patterns of oscillatory activity emerged. Alpha oscillations supported attentional realignment and temporal alignment in visual-first conditions, while Gamma oscillations were recruited during auditory-first uncoordination, reflecting heightened sensory-specific processing demands. These effects were state-dependent, becoming more pronounced during drowsiness. Our findings demonstrate that drowsiness fundamentally reshapes multisensory integration by amplifying sensory dominance mechanisms, particularly vision. Compensatory neural mechanisms involving Alpha and Gamma oscillations maintain perceptual coherence under conditions of reduced cortical interaction. These results provide critical insights into how the brain adapts to sensory conflicts during states of diminished awareness, with broader implications for performance and decision-making in real-world drowsy states.
dc.description.funderANID; Folio: 21170653
dc.format.extent13 páginas
dc.fuente.origenSCOPUS
dc.identifier.doi10.1016/j.ijpsycho.2025.112562
dc.identifier.eissn1872-7697
dc.identifier.issn0167-8760
dc.identifier.scopusidSCOPUS_ID:105002391240
dc.identifier.urihttps://doi.org/10.1016/j.ijpsycho.2025.112562
dc.identifier.urihttps://repositorio.uc.cl/handle/11534/104761
dc.identifier.wosidWOS:001470611500001
dc.information.autorucEscuela de Psicología; Ramírez Benavides, Daniela; S/I; 1048474
dc.information.autorucEscuela de Psicología; Rodríguez B., Eugenio; S/I; 65567
dc.language.isoen
dc.nota.accesocontenido parcial
dc.revistaInternational Journal of Psychophysiology
dc.rightsacceso restringido
dc.subjectAudiovisual stimulation
dc.subjectDrowsiness
dc.subjectEEG
dc.subjectMultisensory integration
dc.subjectSensory dominance
dc.subject.ddc150
dc.subject.deweyPsicologíaes_ES
dc.titleWhen alertness fades: Drowsiness-induced visual dominance and oscillatory recalibration in audiovisual integration
dc.typeartículo
dc.volumen212
sipa.codpersvinculados1048474
sipa.codpersvinculados65567
sipa.trazabilidadSCOPUS;2025-04-20
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