Human vibrotactile frequency discriminative capacity after adaptation to 25 Hz or 200 Hz stimulation

M. Tommerdahl, K. D. Hester, E. R. Felix, M. Hollins, O. V. Favorov, P. M. Quibrera, B. L. Whitsel

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43 Scopus citations

Abstract

A two-interval forced-choice (2-IFC) tracking procedure was used to evaluate the effects of a 15-s pre-exposure to either 25 Hz or 200 Hz stimulation ("25 Hz or 200 Hz adaptation") on human vibrotactile frequency discrimination threshold (frequency DL/Weber fraction). Three subjects were studied. All stimuli (standard and comparison) were delivered to a central location on the thenar eminence of the hand. The frequency DL/Weber fraction was determined for each subject under the following conditions: (1) no recent prior exposure to vibrotactile stimulation ("unadapted"); (2) after 15 s adaptation to 25 Hz stimulation; and (3) after 15 s adaptation to 200 Hz stimulation. The results demonstrate that the effects of frequency of adaptation on frequency discriminative capacity when the standard stimulus is 25 Hz are not the same as when the standard stimulus is 200 Hz. The differential changes in the capacity of subjects to discriminate frequency of cutaneous flutter (10-50 Hz) or vibratory (>200 Hz) stimulation that occur subsequent to a 15-s exposure of the thenar to 25 Hz or 200 Hz stimulation are proposed to reflect frequency-specific, adaptation-induced modification of the response of contralateral primary somatosensory cortex (SI and SII) to skin mechanoreceptor afferent drive.

Original languageEnglish (US)
Pages (from-to)1-9
Number of pages9
JournalBrain research
Volume1057
Issue number1-2
DOIs
StatePublished - Sep 28 2005

Keywords

  • Adaptation
  • Frequency discrimination
  • Neural mechanism
  • Vibrotaction

ASJC Scopus subject areas

  • Neuroscience(all)

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