The origin of the articulatory effect on speech perception

Carneiro, Sarah;Guérit, Charlie;Dutrieux, Charlotte;Vannuscorps, Gilles;et.al.
(2022) Annual Meeting of the Belgian Association of Psychological Sciences — Location: Leuven, Belgium (2.June.2022)

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The execution of silent articulatory lip or tongue movements is known to affect the perception of corresponding (lip or tongue related) speech sounds. This finding is often considered as a piece of evidence that speech perception is supported by motor articulatory resources (the motor interpretation). However, the execution of silent articulatory movements involves also the auditory/phonological system, to which articulatory representations are connected in the service of speech motor control. Hence, the reported effect could be a by-product of the activation of auditory/phonological rather than motor representations (the auditory interpretation). To discriminate these two interpretations, we tested the effect of the execution of both speech-related (experiment 1) and non-speech-related (experiment 2) lip movements on the perception of lip-related and non-lip-related speech sounds. Both lip movements mobilize lip motor representations, but only the speech-related lip movements activate auditory/phonological representations. Therefore, if the motor interpretation is true, both types of lip movements should affect disproportionately the perception of lip-related speech sounds (vs. non-lip-related speech sounds). In contrast with this prediction, and in line with the auditory interpretation, the results indicated that only the execution of speech-related lip movements (experiment 1) interfered significantly more with the perception of lip-related than non-lip-related speech sounds.
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Carneiro, S., Guérit, C., Dutrieux, C., Vannuscorps, G., & et al. (2022). The origin of the articulatory effect on speech perception. Annual Meeting of the Belgian Association of Psychological Sciences, Leuven, Belgium. https://hdl.handle.net/2078.5/29799