The study investigated the neural processing of natural, continuous speech and music in 18 epilepsy patients using intracranial EEG recordings. The results reveal that:
The majority of neural responses are shared between speech and music processing, with only a small percentage being selective to one domain or the other. Selectivity is mostly observed in the lower frequency bands (up to alpha) and is rare in the high-frequency activity.
There is an absence of anatomical regional selectivity, i.e., no single brain region is exclusively dedicated to speech or music processing. Instead, selective responses coexist in space across different frequency bands.
The low-frequency neural activity best encodes the acoustic dynamics of both speech and music, with the strongest encoding observed in the auditory cortex and extending to other regions involved in language and music processing.
The auditory cortex is mostly connected to the rest of the brain through slow neural dynamics, and these connections are also mostly non-domain selective to speech or music.
Overall, the findings highlight the importance of considering the full complexity of natural stimuli and brain dynamics, including the spectral fingerprints of neural activity, to map cognitive and brain functions.
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by te Rietmolen... alle www.biorxiv.org 10-09-2022
https://www.biorxiv.org/content/10.1101/2022.10.08.511398v5Domande più approfondite