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Poster C66 in Poster Session C - Friday, August 9, 2024, 11:15 am – 1:15 pm, Johnson Ice Rink
Temporal and Hemispheric Dynamics in Neural Processing of Auditory Stimuli Across Linguistic Complexity: A MEG Source Space Study
Patrick Krauss1 (), Nikola Koelbl2, Nadia Mueller-Voggel2, Stefan Rampp2, Martin Kaltenhaeuser2, Konstantin Tziridis2, Achim Schilling1; 1University Erlangen-Nuremberg, 2University Hospital Erlangen
In this study we investigated the neural processing of auditory stimuli of varying complexity: a non-linguistic (pure tone), a simple linguistic (phoneme) and a complex linguistic (word) stimulus. We recorded brain activity of 30 healthy, right-handed participants using magnetoencephalography (MEG), and compared the resulting evoked fields (ERFs) in source space in three different time intervals, i.e. early (0-250ms), mid (250-500ms) and late (500-750ms) responses. Our results reveal a bilateral activation during early response and right-lateralized activation in the mid-phase for all stimuli. Hoewever, the late response exhibited lateralization variations. The pure tone predominantly activated the right hemisphere, consistent with pitch processing theories. The phoneme primarily engaged the left hemisphere, supporting its role in phonemic processing. Notably, the word elicited activation in both hemispheres, reflecting phonemic processing on the left and stress patterns on the right. These findings highlight the intricate interplay between temporal processing and hemispheric lateralization in speech perception, emphasizing the importance of stimulus complexity and temporal dynamics in understanding auditory and speech processing.
Keywords: MEG speech language source space