Effortful listening produces both enhancement and suppression of alpha in the EEG.

Autor: Wisniewski MG; Department of Psychological Sciences, Kansas State University, Manhattan, Kansas, USA., Zakrzewski AC; Department of Psychological Sciences, Kansas State University, Manhattan, Kansas, USA.
Jazyk: angličtina
Zdroj: Auditory perception & cognition [Audit Percept Cogn] 2023; Vol. 6 (3-4), pp. 289-299. Date of Electronic Publication: 2023 Jul 20.
DOI: 10.1080/25742442.2023.2218239
Abstrakt: Introduction: Adverse listening conditions can drive increased mental effort during listening. Neuromagnetic alpha oscillations (8-13 Hz) may index this listening effort , but inconsistencies regarding the direction of the relationship are abundant. We performed source analyses on high-density EEG data collected during a speech-on-speech listening task to address the possibility that opposing alpha power relationships among alpha producing brain sources drive this inconsistency.
Methods: Listeners ( N =20) heard two simultaneously presented sentences of the form: Ready go to now. They either reported the color/number pair of a "Baron" call sign sentence (active: high effort), or ignored the stimuli (passive: low effort). Independent component analysis (ICA) was used to segregate temporally distinct sources in the EEG.
Results: Analysis of independent components (ICs) revealed simultaneous alpha enhancements (e.g., for somatomotor mu ICs) and suppressions (e.g., for left temporal ICs) for different brain sources. The active condition exhibited stronger enhancement for left somatomotor mu rhythm ICs, but stronger suppression for central occipital ICs.
Discussion: This study shows both alpha enhancement and suppression to be associated with increases in listening effort. Literature inconsistencies could partially relate to some source activities overwhelming others in scalp recordings.
Competing Interests: Disclosure statement The authors report there are no competing interests to declare.
Databáze: MEDLINE
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