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Influences of cognitive load on sensorimotor contributions to working memory: An EEG investigation of mu rhythm activity during speech discrimination.
Neurobiol Learn Mem 2019; 166:107098NL

Abstract

Sensorimotor activity during speech perception is highly variable and is thought to be related to the underlying cognitive processes recruited to meet task demands. The purpose of the current study was to evaluate the impact of cognitive load on sensorimotor-based attention and working memory processes during speech perception. Manipulations of set size and signal clarity were employed to alter cognitive load. Raw EEG data recorded from 42 subjects during accurate discrimination of CV syllable pairs were decomposed by Independent component analysis; identifying sensorimotor mu components from 37 subjects. Time-frequency analyses revealed event related desynchronization (ERD) across alpha and beta frequency bands during and following stimulus presentation in all conditions, reflecting working memory maintenance through covert articulatory rehearsal. No early attentional activity was observed, suggesting adaptation to tasks. However, modulation of late working memory activity was observed between degraded and non-degraded conditions. Weak and delayed alpha and beta ERD in degraded conditions were interpreted as evidence of delayed implementation of covert rehearsal due to the prolonged time necessary to extract a phonological representation from the auditory signal. Findings are interpreted within Analysis by Synthesis to characterize the multi-faceted and temporally distinct contributions of anterior sensorimotor regions to working memory in support of speech discrimination.

Authors+Show Affiliations

Washington State University, Elson S. Floyd College of Medicine, Department of Speech and Hearing Sciences, Spokane, WA, USA. Electronic address: david.jenson@wsu.edu.Gallaudet University, Department of Hearing, Speech and Language Science, Washington, DC, USA.University of Tennessee Health Science Center, College of Health Professions, Department of Audiology and Speech-Pathology, Knoxville, TN, USA.University of Tennessee Health Science Center, College of Health Professions, Department of Audiology and Speech-Pathology, Knoxville, TN, USA.

Pub Type(s)

Journal Article

Language

eng

PubMed ID

31634566

Citation

Jenson, David, et al. "Influences of Cognitive Load On Sensorimotor Contributions to Working Memory: an EEG Investigation of Mu Rhythm Activity During Speech Discrimination." Neurobiology of Learning and Memory, vol. 166, 2019, p. 107098.
Jenson D, Thornton D, Harkrider AW, et al. Influences of cognitive load on sensorimotor contributions to working memory: An EEG investigation of mu rhythm activity during speech discrimination. Neurobiol Learn Mem. 2019;166:107098.
Jenson, D., Thornton, D., Harkrider, A. W., & Saltuklaroglu, T. (2019). Influences of cognitive load on sensorimotor contributions to working memory: An EEG investigation of mu rhythm activity during speech discrimination. Neurobiology of Learning and Memory, 166, p. 107098. doi:10.1016/j.nlm.2019.107098.
Jenson D, et al. Influences of Cognitive Load On Sensorimotor Contributions to Working Memory: an EEG Investigation of Mu Rhythm Activity During Speech Discrimination. Neurobiol Learn Mem. 2019 Oct 18;166:107098. PubMed PMID: 31634566.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Influences of cognitive load on sensorimotor contributions to working memory: An EEG investigation of mu rhythm activity during speech discrimination. AU - Jenson,David, AU - Thornton,David, AU - Harkrider,Ashley W, AU - Saltuklaroglu,Tim, Y1 - 2019/10/18/ PY - 2019/01/24/received PY - 2019/09/11/revised PY - 2019/10/09/accepted PY - 2019/10/22/pubmed PY - 2019/10/22/medline PY - 2019/10/22/entrez SP - 107098 EP - 107098 JF - Neurobiology of learning and memory JO - Neurobiol Learn Mem VL - 166 N2 - Sensorimotor activity during speech perception is highly variable and is thought to be related to the underlying cognitive processes recruited to meet task demands. The purpose of the current study was to evaluate the impact of cognitive load on sensorimotor-based attention and working memory processes during speech perception. Manipulations of set size and signal clarity were employed to alter cognitive load. Raw EEG data recorded from 42 subjects during accurate discrimination of CV syllable pairs were decomposed by Independent component analysis; identifying sensorimotor mu components from 37 subjects. Time-frequency analyses revealed event related desynchronization (ERD) across alpha and beta frequency bands during and following stimulus presentation in all conditions, reflecting working memory maintenance through covert articulatory rehearsal. No early attentional activity was observed, suggesting adaptation to tasks. However, modulation of late working memory activity was observed between degraded and non-degraded conditions. Weak and delayed alpha and beta ERD in degraded conditions were interpreted as evidence of delayed implementation of covert rehearsal due to the prolonged time necessary to extract a phonological representation from the auditory signal. Findings are interpreted within Analysis by Synthesis to characterize the multi-faceted and temporally distinct contributions of anterior sensorimotor regions to working memory in support of speech discrimination. SN - 1095-9564 UR - https://www.unboundmedicine.com/medline/citation/31634566/Influences_of_Cognitive_Load_on_Sensorimotor_Contributions_to_Working_Memory:_An_EEG_investigation_of_mu_rhythm_activity_during_speech_discrimination L2 - https://linkinghub.elsevier.com/retrieve/pii/S1074-7427(19)30165-0 DB - PRIME DP - Unbound Medicine ER -