Mechanical frequency and stimulation-site-related differences in vibrotactile detection capacity along the lip vermilion in young adults

R. D. Andreatta, J. H. Davidow

Research output: Contribution to journalArticlepeer-review

12 Scopus citations

Abstract

Accurate clinical assessment of the infraorbital and mental branch of the trigeminal nerve is aided by an appreciation of the variations in sensitivity that may exist along the surface of the perioral region under examination. The purpose of this investigation was to map the mediolateral spatial and frequency variations in vibrotactile detection capacity to inputs delivered to the upper lip (UL) and lower lip (LL) vermilion. Mechanical vibrotactile inputs at frequencies of 5, 10, 50, and 150 Hz were delivered to three locations on the vermilion of the UL and LL: midsagittally and laterally (left and right) at a point halfway between the midsagittal plane and the oral angle. An adapted staircase tracking method was used to converge upon a threshold value for each test frequency at each stimulation site. The results indicated that midsagittal vermilion sites were significantly more sensitive to our range of vibrotactile inputs compared to lateral vermilion locations. In addition, no significant differences in sensitivity as a function of laterality or between the UL and LL vermilion sites were noted. Greater midline sensitivity to vibrotactile stimulation suggests that receptive fields at this location may be of greater density and/or demonstrate greater overlap compared to lateral vermilion sites.

Original languageEnglish
Pages (from-to)17-22
Number of pages6
JournalClinical Oral Investigations
Volume10
Issue number1
DOIs
StatePublished - Mar 2006

Bibliographical note

Funding Information:
Acknowledgements Gratitude is expressed to Dr. Anne Bothe for editorial advice on earlier drafts. This project was supported by a University of Georgia Research Foundation Junior Faculty Award and a fellowship from the UGA Institute for Behavioral Research.

Keywords

  • Mechanoreceptor
  • Perception
  • Psychophysics
  • Somatosensory
  • Trigeminal

ASJC Scopus subject areas

  • General Dentistry

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