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Cognitive load elevates discrimination thresholds of duration, intensity, and f₀ for a synthesized vowel

Chiu, Faith and Rakusen, Lyndon L and Mattys, Sven L (2019) 'Cognitive load elevates discrimination thresholds of duration, intensity, and f₀ for a synthesized vowel.' Journal of the Acoustical Society of America, 146 (2). pp. 1077-1084. ISSN 0001-4966

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Abstract

Dual-tasking negatively impacts on speech perception by raising cognitive load (CL). Previous research has shown that CL increases reliance on lexical knowledge and decreases reliance on phonetic detail. Less is known about the effect of CL on the perception of acoustic dimensions below the phonetic level. This study tested the effect of CL on the ability to discriminate differences in duration, intensity, and fundamental frequency of a synthesized vowel. A psychophysical adaptive procedure was used to obtain just noticeable differences (JNDs) on each dimension under load and no load. Load was imposed by N-back tasks at two levels of difficulty (one-back, two-back) and under two types of load (images, nonwords). Compared to a control condition with no CL, all N-back conditions increased JNDs across the three dimensions. JNDs were also higher under two-back than one-back load. Nonword load was marginally more detrimental than image load for intensity and fundamental frequency discrimination. Overall, the decreased auditory acuity demonstrates that the effect of CL on the listening experience can be traced to distortions in the perception of core auditory dimensions.

Item Type: Article
Divisions: Faculty of Social Sciences
Faculty of Social Sciences > Language and Linguistics, Department of
SWORD Depositor: Elements
Depositing User: Elements
Date Deposited: 16 Jul 2021 13:19
Last Modified: 18 Aug 2022 10:36
URI: http://repository.essex.ac.uk/id/eprint/26480

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