Effects of Task Demands on Neural Correlates of Acoustic and Semantic Processing in Challenging Listening Conditions

Autor/inn/en	Devaraju, Dhatri S.; Kemp, Amy; Eddins, David A.; Shrivastav, Rahul; Chandrasekaran, Bharath; Wray, Amanda Hampton
Titel	Effects of Task Demands on Neural Correlates of Acoustic and Semantic Processing in Challenging Listening Conditions
Quelle	In: Journal of Speech, Language, and Hearing Research, 64 (2021) 9, S.3697-3706 (10 Seiten) PDF als Volltext Verfügbarkeit
Zusatzinformation	ORCID (Devaraju, Dhatri S.) ORCID (Shrivastav, Rahul) ORCID (Chandrasekaran, Bharath) ORCID (Wray, Amanda Hampton)
Sprache	englisch
Dokumenttyp	gedruckt; online; Zeitschriftenaufsatz
ISSN	1092-4388
Schlagwörter	Semantics; Acoustics; Language Processing; Difficulty Level; Brain Hemisphere Functions; Diagnostic Tests; Listening Comprehension; Cues; Correlation; Speech Communication; Vocabulary; Task Analysis; Adults; Auditory Stimuli + Suchen Sie Ihr Suchwort? Semantik; Akustik; Sprachverarbeitung; Schwierigkeitsgrad; Diagnostic test; Diagnostischer Test; Hörverständnis; Stichwort; Korrelation; Wortschatz; Aufgabenanalyse; Auditive Stimulation
Abstract	Purpose: Listeners shift their listening strategies between lower level acoustic information and higher level semantic information to prioritize maximum speech intelligibility in challenging listening conditions. Although increasing task demands via acoustic degradation modulates lexical-semantic processing, the neural mechanisms underlying different listening strategies are unclear. The current study examined the extent to which encoding of lower level acoustic cues is modulated by task demand and associations with lexical-semantic processes. Method: Electroencephalography was acquired while participants listened to sentences in the presence of four-talker babble that contained either higher or lower probability final words. Task difficulty was modulated by time available to process responses. Cortical tracking of speech-neural correlates of acoustic temporal envelope processing--were estimated using temporal response functions. Results: Task difficulty did not affect cortical tracking of temporal envelope of speech under challenging listening conditions. Neural indices of lexical-semantic processing (N400 amplitudes) were larger with increased task difficulty. No correlations were observed between the cortical tracking of temporal envelope of speech and lexical-semantic processes, even after controlling for the effect of individualized signal-to-noise ratios. Conclusions: Cortical tracking of the temporal envelope of speech and semantic processing are differentially influenced by task difficulty. While increased task demands modulated higher level semantic processing, cortical tracking of the temporal envelope of speech may be influenced by task difficulty primarily when the demand is manipulated in terms of acoustic properties of the stimulus, consistent with an emerging perspective in speech perception. (As Provided).
Anmerkungen	American Speech-Language-Hearing Association. 2200 Research Blvd #250, Rockville, MD 20850. Tel: 301-296-5700; Fax: 301-296-8580; e-mail: slhr@asha.org; Web site: http://jslhr.pubs.asha.org
Erfasst von	ERIC (Education Resources Information Center), Washington, DC
Update	2024/1/01