Mechanosensory modulation of perioral neuronal groups during active force dynamics

Richard D. Andreatta, Steven M. Barlow, Amitava Biswas, Donald S. Finan

Research output: Contribution to journalArticle

12 Scopus citations

Abstract

The spatiotemporal organization of the mechanically evoked perioral sensorimotor response was sampled from five normal females using a custom-designed linear motor operating under force feedback. Electromyographic activity was sampled from the superior and inferior segments of the orbicularis oris muscle during the production of a visually guided ramp-and-hold lip-rounding task. Brief mechanical inputs of approximately 0.45 N delivered to the left upper lip during the ramp-and-hold task produced a composite myogenic response characterized by phases of excitation and suppression. Modulation of the primary excitatory component (R1) of the mechanically evoked perioral response was found to be highly dependent upon the rate of force recruitment (1 N/s vs. 4 N/s) and the phase of force recruitment (20% vs. 50% vs. 80% of 1 N end-point force). Modulation of later occurring inhibitory (S1) and excitatory (R2) potentials were also found to be dependent upon differences in the rate and phase of force recruitment. The organization of the perioral sensorimotor response is considered in relation to speech motor control and the dynamic organization of neuronal groups subserving perioral sensorimotor activity.

Original languageEnglish (US)
Pages (from-to)1006-1017
Number of pages12
JournalJournal of Speech, Language, and Hearing Research
Volume39
Issue number5
DOIs
StatePublished - Oct 1996

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Keywords

  • Dynamic force control
  • Electromyography
  • Neuronal groups
  • Orbicularis oris
  • Sensorimotor

ASJC Scopus subject areas

  • Language and Linguistics
  • Linguistics and Language
  • Speech and Hearing

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