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The early but not the late neural correlate of auditory awareness reflects lateralized experiences
Stockholms universitet, Samhällsvetenskapliga fakulteten, Psykologiska institutionen, Perception och psykofysik.ORCID-id: 0000-0001-9924-5486
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: 0000-0003-4531-4313
Antal upphovsmän: 32021 (Engelska)Ingår i: Neuropsychologia, ISSN 0028-3932, E-ISSN 1873-3514, Vol. 158, artikel-id 107910Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

Theories disagree as to whether it is the early or the late neural correlate of awareness that plays a critical role in phenomenal awareness. According to recurrent processing theory, early activity in primary sensory areas corresponds closely to phenomenal awareness. In support, research with electroencephalography found that in the visual and somatosensory modality, an early neural correlate of awareness is contralateral to the perceived side of stimulation. Thus, early activity is sensitive to the perceived side of visual and somatosensory stimulation. Critically, it is unresolved whether this is true also for hearing. In the present study (N = 26 students), Bayesian analyses showed that the early neural correlate of awareness (auditory awareness negativity, AAN) was stronger for contralateral than ipsilateral electrodes whereas the late correlate of auditory awareness (late positivity, LP) was not lateralized. These findings demonstrate that the early but not the late neural correlate of auditory awareness reflects lateralized experiences. Thus, these findings imply that AAN is a more suitable NCC than LP because it correlates more closely with lateralized experiences.

Ort, förlag, år, upplaga, sidor
2021. Vol. 158, artikel-id 107910
Nyckelord [en]
auditory, consciousness, auditory awareness negativity, late positivity, lateralization
Nationell ämneskategori
Psykologi Neurovetenskaper
Forskningsämne
psykologi
Identifikatorer
URN: urn:nbn:se:su:diva-197048DOI: 10.1016/j.neuropsychologia.2021.107910ISI: 000672326100011PubMedID: 34090867OAI: oai:DiVA.org:su-197048DiVA, id: diva2:1597567
Tillgänglig från: 2021-09-27 Skapad: 2021-09-27 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: 2025-04-11Bibliografiskt granskad

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Eklund, RasmusGerdfeldter, BillyWiens, Stefan

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