ERIC Number: EJ869134
Record Type: Journal
Publication Date: 2009-Dec
Abstractor: As Provided
Reference Count: 0
Somatosensory Gating Is Dependent on the Rate of Force Recruitment in the Human Orofacial System
Andreatta, Richard D.; Barlow, Steven M.
Journal of Speech, Language, and Hearing Research, v52 n6 p1566-1578 Dec 2009
Purpose: Functional orofacial behaviors vary in their force endpoint and rate of recruitment. This study assessed the gating of orofacial cutaneous somatosensation during different cyclic lip force recruitment rates. Understanding how differences in the rate of force recruitment influences trigeminal system function is an important step toward furthering the knowledge of orofacial sensorimotor control. Method: Lower lip vibrotactile detection thresholds (LL-VDTs) were sampled in response to sinusoidal inputs delivered to the lip vermilion at 5, 10, 50, and 150 Hz while adult participants engaged in a baseline condition (no force), 2 low-level lip force recruitment tasks differing by rate (0.1 Hz or 2 Hz), and passive displacement of the lip as a control to approximate the mechanosensory consequences of voluntary movement. Results: LL-VDTs increased significantly for test frequencies at or below 50 Hz during voluntary lip force recruitment. LL-VDT shifts were positively related to changes in the rate of lip force recruitment, whereas passively imposed displacements of the lip were ineffective in shifting LL-VDTs. Conclusions: These findings are considered in relation to published reports of force-related sensory gating in orofacial and limb systems and the potential role of somatosensory gating along the trigeminal system during orofacial behaviors.
Descriptors: Nonverbal Communication, Psychomotor Skills, Motor Reactions, Brain, Adults, Motion, Correlation, Olfactory Perception, Speech, Adjustment (to Environment), Evaluation Methods
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Publication Type: Journal Articles; Reports - Evaluative
Education Level: N/A
Authoring Institution: N/A