Effects of cognitive workload on speech production

Acoustic analyses and perceptual consequences

S. E. Lively, David Pisoni, W. Van Summers, R. H. Bernacki

Research output: Contribution to journalArticle

53 Citations (Scopus)

Abstract

The present investigation examined the effects of cognitive workload on speech production. Workload was manipulated by having talkers perform a compensatory visual tracking task while speaking test sentences of the form 'Say hVd again.' Acoustic measurements were made to compare utterances produced under workload with the same utterances produced in a control condition. In the workload condition, some talkers produced utterances with increased amplitude and amplitude variability, decreased spectral tilt and F0 variability and increased speaking rate. No changes in F1, F2, or F3 were observed across conditions for any of the talkers. These findings indicate both laryngeal and sublaryngeal adjustments in articulation, as well as modifications in the absolute timing of articulatory gestures. The results of a perceptual identification experiment paralleled the acoustic measurements. Small but significant advantages in intelligibility were observed for utterances produced under workload for talkers who showed robust changes in speech production. Changes in amplitude and amplitude variability for utterances produced under workload appeared to be the major factor controlling intelligibility. The results of the present investigation support the assumptions of Lindblom's ['Explaining phonetic variation: A sketch of the H and H theory,' in Speech Production and Speech Modeling (Klewer Academic, The Netherlands, 1990)] H and H model: Talkers adapt their speech to suit the demands of the environment and these modifications are designed to maximize intelligibility.

Original languageEnglish
Pages (from-to)2962-2973
Number of pages12
JournalJournal of the Acoustical Society of America
Volume93
Issue number5
StatePublished - 1993

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intelligibility
acoustics
acoustic measurement
compensatory tracking
optical tracking
phonetics
sentences
Netherlands
adjusting
time measurement
Speech Production
Acoustics
Workload
Talkers
Utterance
Intelligibility

ASJC Scopus subject areas

  • Acoustics and Ultrasonics

Cite this

Effects of cognitive workload on speech production : Acoustic analyses and perceptual consequences. / Lively, S. E.; Pisoni, David; Van Summers, W.; Bernacki, R. H.

In: Journal of the Acoustical Society of America, Vol. 93, No. 5, 1993, p. 2962-2973.

Research output: Contribution to journalArticle

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