Modulation of the trigeminofacial pathway during syllabic speech.

Modulation of the trigeminofacial pathway during syllabic speech. Research Abstract Details 

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Modulation of the trigeminofacial pathway during syllabic speech. Abstract Text:

Meredith Estep,Steven M Barlow,Meredith Estep,Steven M Barlow,

The human orofacial system is richly endowed with low-threshold, slowly adapting mechanoreceptors that respond to self-generated movements and external loads. The functional linkage between these afferents and the recruitment of motor units in the lower face during the dynamics of speech is unknown. Mechanically evoked activity in the orbicularis oris muscles was studied in young human female adults (N=10) during a lip force recruitment task associated with the repetition of the nonsense speech utterance "ah-wah." This speech task involved the recruitment of perioral motor units against an elastic load. A skin contactor probe coupled to a servo-controlled linear motor delivered punctate ipsilateral mechanical inputs (25 ms duration, 1800 mum displacement) to the glabrous surface of the upper lip in order to index the modulation and specificity of the compound trigeminofacial response as a function of speech force recruitment threshold (Ft). Modulation of the early (Ft=0.2 N) and later (Ft=1.0 N) components of the evoked perioral response was found at the two force thresholds. Beginning at approximately 60 ms post-stimulus, a significant suppression response was found among lower lip EMG recording sites and its magnitude was greatest when the mechanical perturbation occurred during the early phase of lip force recruitment. Variation in the lip force trajectories was manifest by a greater difference in net interangle force associated with lip perturbations indexed to the early Ft. This was interpreted to reflect the operation of a feedforward mechanism which may play a more significant role during an evolving speech action. Thus, the application of servo-controlled mechanosensory inputs effectively indexed the excitability of the facial motor nucleus during production of a simple speech phrase. Future studies are needed to explore mechanisms of short-term adaptation and trigeminofacial modulation during propositional speech in health and disease.

Modulation of the trigeminofacial pathway during syllabic speech. Publishing Authors By Initials

M Estep,SM Barlow,M Estep,SM Barlow,

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Modulation of the trigeminofacial pathway during syllabic speech. Journal Published:

PUBLICATION TYPE: Research Support, N.I.H., Extr

Journal: Brain research

VOLUME: 1171

Page Numbers: 67-74

Journal Abbreviation: Brain Res.

ISSN: 0006-8993

DAY: 3

MONTH: 08

YEAR: 2007

Modulation of the trigeminofacial pathway during syllabic speech. Information

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LANGUAGE: eng

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Grant and Affiliation Information for Modulation of the trigeminofacial pathway during syllabic speech.

AFFILIATION: Communication Neuroscience Laboratories, University of Kansas, Lawrence, KS 66045-7555, USA. mestep@ku.edu

Country: Netherlands

AGENCY: United States NIDCD

GRANT: R01 DC03311-05

ACRONYM: DC

MEDLINETA: Brain Res

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