UCL Discovery
UCL home » Library Services » Electronic resources » UCL Discovery

Pterygoid muscle activity in speech: A preliminary investigation

Murray, GM; Carignan, C; Whittle, T; Gal, JA; Best, C; (2022) Pterygoid muscle activity in speech: A preliminary investigation. Journal of Oral Rehabilitation 10.1111/joor.13377. (In press). Green open access

[thumbnail of Pterygoid muscle activity in speech.pdf]
Preview
Text
Pterygoid muscle activity in speech.pdf - Published Version

Download (2MB) | Preview

Abstract

Background: Speaking depends on refined control of jaw opening and closing movements. The medial pterygoid muscle (MPT), involved in jaw closing, and the lateral pterygoid muscle (LPT), involved in jaw opening, are two key mandibular muscles in mastication and are likely to be recruited for controlled movements in speech. Objectives: Three hypotheses were investigated, that during speech the MPT and LPT: (1) were both active, (2) but exhibited different patterns of activity, (3) which fluctuated with the vowels and consonants in speech. Methods: Intramuscular EMG recordings were made from the right inferior head of the LPT and/or the right MPT in five participants during production of 40 target nonsense words (NWs) consisting of three syllables in the form /V1 C1V2 C2ə/ (V = vowel; C = consonant; ə = unstressed, reduced vowel), spoken by each participant 10 times per NW; analysis focussed on the target syllable, C1V2. Results: Both MPT and LPT exhibited robust increases in EMG activity during utterance of most NWs, relative to rest. Peak LPT activation was time-locked to the final part of the target consonant (C1) interval when the jaw begins opening for the target vowel (V2), whereas peak MPT activation occurred around the temporal midpoint of V2, when the jaw begins closing for C2. EMG amplitude peaks differed in magnitude between “high” vowels, i.e., for which the tongue/jaw are high (e.g., in SEEK), and “low” vowels, i.e., for which the tongue/jaw are low (e.g., in SOCK). Conclusions: These novel findings suggest a key role for the LPT and MPT in the fine control of speech production. They imply that speech may impose major synergistic demands on the activities of the MPT and the LPT, and thereby provide insights into the possible interactions between speech activities and orofacial activities (e.g. mastication) and conditions (e.g. Temporomandibular Disorders) that involve the masticatory muscles.

Type: Article
Title: Pterygoid muscle activity in speech: A preliminary investigation
Location: England
Open access status: An open access version is available from UCL Discovery
DOI: 10.1111/joor.13377
Publisher version: https://doi.org/10.1111/joor.13377
Language: English
Additional information: This is an open access article under the terms of the Creative Commons Attribution-NonCommercial License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited and is not used for commercial purposes. See: http://creativecommons.org/licenses/by-nc/4.0/
Keywords: Computed tomography, electromyography, language, mandibular muscles, masticatory muscles, speech sounds
UCL classification: UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Brain Sciences
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Brain Sciences > Div of Psychology and Lang Sciences > Speech, Hearing and Phonetic Sciences
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences
UCL
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Brain Sciences > Div of Psychology and Lang Sciences
URI: https://discovery.ucl.ac.uk/id/eprint/10158179
Downloads since deposit
75Downloads
Download activity - last month
Download activity - last 12 months
Downloads by country - last 12 months

Archive Staff Only

View Item View Item