Files and links (2)
CC BY V4.0, Open Access
Journal article
Sensorimotor contributions to working memory differ between the discrimination of Same and Different syllable pairs
Neuropsychologia, Vol.159, pp.107947-107947
08/20/2021
PMID: 34216594
Abstract
Sensorimotor activity during speech perception is both pervasive and highly variable, changing as a function of the cognitive demands imposed by the task. The purpose of the current study was to evaluate whether the discrimination of Same (matched) and Different (unmatched) syllable pairs elicit different patterns of sensorimotor activity as stimuli are processed in working memory. Raw EEG data recorded from 42 participants were decomposed with independent component analysis to identify bilateral sensorimotor mu rhythms from 36 subjects. Time frequency decomposition of mu rhythms revealed concurrent event related desynchronization (ERD) in alpha and beta frequency bands across the peri- and post-stimulus time periods, which were interpreted as evidence of sensorimotor contributions to working memory encoding and maintenance. Left hemisphere alpha/beta ERD was stronger in Different trials than Same trials during the post-stimulus period, while right hemisphere alpha/beta ERD was stronger in Same trials than Different trials. A between-hemispheres contrast revealed no differences during Same trials, while post-stimulus alpha/beta ERD was stronger in the left hemisphere than the right during Different trials. Results were interpreted to suggest that predictive coding mechanisms lead to repetition suppression effects in Same trials. Mismatches arising from predictive coding mechanisms in Different trials shift subsequent working memory processing to the speech-dominant left hemisphere. Findings clarify how sensorimotor activity differentially supports working memory encoding and maintenance stages during speech discrimination tasks and have potential to inform sensorimotor models of speech perception and working memory.
•Sensorimotor activity differs for Same/Different pairs during speech discrimination.•Different stimulus pairs elicit stronger late left hemisphere sensorimotor activity.•Same stimulus pairs elicit weaker late right hemisphere sensorimotor activity.•Same syllable pairs elicit repetition suppression in the anterior dorsal stream.•Mu oscillations encode sensorimotor contributions to working memory.
Metrics
14 Record Views
Details
- Title
- Sensorimotor contributions to working memory differ between the discrimination of Same and Different syllable pairs
- Creators
- David Jenson (Author)Tim Saltuklaroglu (Author) - University of Tennessee Health Science Center, College of Health Professions, Department of Audiology and Speech-Pathology, Knoxville, TN, USA
- Publication Details
- Neuropsychologia, Vol.159, pp.107947-107947
- Academic Unit
- Speech and Hearing Sciences, Department of
- Publisher
- Elsevier Ltd
- Identifiers
- 99901007440601842
- Language
- English
- Resource Type
- Journal article