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Examining the lateralization of electrophysiological correlates of auditory awareness
Stockholms universitet, Samhällsvetenskapliga fakulteten, Psykologiska institutionen, Perception och psykofysik.ORCID-id: 0000-0002-3222-8056
Stockholms universitet, Samhällsvetenskapliga fakulteten, Psykologiska institutionen, Perception och psykofysik.ORCID-id: 0000-0002-9932-8924
Stockholms universitet, Samhällsvetenskapliga fakulteten, Psykologiska institutionen, Perception och psykofysik.ORCID-id: 0000-0003-4531-4313
Antal upphovsmän: 32024 (Engelska)Ingår i: Psychophysiology, ISSN 0048-5772, E-ISSN 1469-8986, Vol. 61, nr 11, artikel-id e14656Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

The neurological basis for perceptual awareness remains unclear, and theories disagree as to whether sensory cortices per se generate awareness. Critically, neural activity in the sensory cortices is only a neural correlate of consciousness (NCC) if it closely matches the contents of perceptual awareness. Research in vision and touch suggest that contralateral activity in sensory cortices is an NCC. Similarly, research in hearing with two sound sources (left and right) presented over headphones also suggests that a candidate NCC called the auditory awareness negativity (AAN) matches perceived location of sound. The current study used 13 different sound sources presented over loudspeakers for natural localization cues and measured event-related potentials to a threshold stimulus in a sound localization task. Preregistered Bayesian mixed models provided moderate evidence against an overall AAN and very strong evidence against its lateralization. Because of issues regarding data quantity and quality, exploratory analyses with aggregated data from multiple loudspeakers were conducted. Results provided moderate evidence for an overall AAN and strong evidence against its lateralization. Nonetheless, the interpretations of these results remain inconclusive. Therefore, future research should reduce the number of conditions and/or test over several sessions to procure a sufficient amount of data. Taken at face value, the results may suggest issues with AAN as an NCC of auditory awareness, as it does not laterally map onto experiences in a free-field auditory environment, in contrast to the NCCs of vision and touch.

Ort, förlag, år, upplaga, sidor
2024. Vol. 61, nr 11, artikel-id e14656
Nyckelord [en]
electrophysiological correlates, auditory awareness, perceptual awareness, neural correlate of consciousness, sound localization, auditory, hearing
Nationell ämneskategori
Psykologi
Forskningsämne
psykologi
Identifikatorer
URN: urn:nbn:se:su:diva-235996DOI: 10.1111/psyp.14656ISI: 001282550700001Scopus ID: 2-s2.0-85200253012OAI: oai:DiVA.org:su-235996DiVA, id: diva2:1916124
Anmärkning

Open access funding was provided by Stockholm University. This work was supported by a grant to Stefan Wiens from Marianne and Marcus Wallenberg Foundation (MMW 2019.0102).

Tillgänglig från: 2024-11-26 Skapad: 2024-11-26 Senast uppdaterad: 2025-03-31Bibliografiskt granskad
Ingår i avhandling
1. Neural Correlates of Consciousness in Sound Localization
Öppna denna publikation i ny flik eller fönster >>Neural Correlates of Consciousness in Sound Localization
2025 (Engelska)Doktorsavhandling, sammanläggning (Övrigt vetenskapligt)
Abstract [en]

Within neuroscience, biological markers of consciousness are known as the neural correlates of consciousness (NCCs). Electrophysiological data have suggested two candidate NCCs in hearing: the auditory awareness negativity (AAN), and late positivity (LP). The AAN is linked to phenomenal awareness of sound, and the LP to post-perceptual behavioral response and executive control. Earlier research on the analogs of the AAN in both vision and touch found topographical mapping onto the cerebral hemisphere that is contralateral to stimulus source. Similar research has not been conducted on the AAN. Sound localization is the ability to perceive spatial locations of sound sources. Localization of sound in the horizontal dimension utilizes binaural cues of time and intensity differences. Sound is typically perceived from outside the head and is localized to a physical space (sound localization). When sound is perceived within the head, by using headphones, sound is instead lateralized to the left or right along an intracranial axis (sound lateralization). The thesis comprised three studies of threshold-level identification tasks, where listeners were tasked to localize laterally displaced sounds. The first study tested the NCCs to sound lateralization using a binaural click stimulus that was lateralized randomly toward either ear, presented through headphones. Then, the second study tested the NCCs to sound localization using a square pulse stimulus played from random positions in a semicircular array of thirteen horizontally displaced equidistant loudspeakers. In the third study, the NCCs to different binaural cues in sound lateralization were tested, specifically manipulating differences in time and intensity with the same stimulus and equipment used in the first study. The overall results showed that the AAN contralaterally changes in relation to experienced sound source only in sound lateralization, and only in the tested condition where binaural cues of time and intensity differences were combined. The LP showed a hemispheric contralateral effect in relation to experienced sound source, but only to sound localization. This contralateral effect may be an attentional artifact of audiovisual integration, as the loudspeakers were seen by the listeners. The thesis suggests that the NCCs to sound localization and sound lateralization differ in expression based on hearing medium.

Ort, förlag, år, upplaga, sidor
Stockholm: Department of Psychology, Stockholm University, 2025. s. 55
Nyckelord
neural correlates of consciousness, NCC, auditory awareness negativity, AAN, hearing, sound localization, electroencephalography, EEG, event-related potential, ERP
Nationell ämneskategori
Psykologi (Exklusive tillämpad psykologi)
Forskningsämne
psykologi
Identifikatorer
urn:nbn:se:su:diva-241493 (URN)978-91-8107-192-4 (ISBN)978-91-8107-193-1 (ISBN)
Disputation
2025-05-23, Lärosal 31, hus 4, våning 2, Albanovägen 12, Stockholm, 13:00 (Engelska)
Opponent
Handledare
Tillgänglig från: 2025-04-25 Skapad: 2025-03-31 Senast uppdaterad: 2026-01-19Bibliografiskt granskad

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Gerdfeldter, BillyAndersson, AnnikaWiens, Stefan

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