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Imposed vibration influences perceived tactile smoothness.

M Hollins1, A Fox, C Bishop

  • 1Department of Psychology, University of North Carolina at Chapel Hill, Chapel Hill, NC 27599, USA. mhollins@email.unc.edu

Perception
|March 22, 2001
PubMed
Summary

Vibrations detected by the skin (vibrotaction) significantly impact how we perceive fine textures. Increasing vibration intensity makes surfaces feel less smooth, supporting the duplex theory of tactile perception.

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Area of Science:

  • Neuroscience
  • Psychology
  • Sensory Perception

Background:

  • The duplex theory of tactile texture perception posits that cutaneous vibrations are crucial for discerning fine textures.
  • This theory suggests that a vibrating surface should be perceived differently from a stationary one.

Purpose of the Study:

  • To investigate the role of vibrotaction in tactile texture perception.
  • To determine if surface vibration affects perceived smoothness.

Main Methods:

  • Two identical surfaces were presented to subjects, with one surreptitiously vibrating.
  • Subjects judged which surface felt smoother, with varying vibration amplitudes (150 Hz) and frequencies (150-400 Hz) at equated sensation levels.

Main Results:

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  • As vibration amplitude increased, the vibrating surface was judged smoother less often.
  • The effect was consistent regardless of whether subjects were aware of the vibration.
  • Different frequencies were equally effective when matched for sensation level.

Conclusions:

  • Vibrotaction plays a significant role in tactile texture perception.
  • The Pacinian mechanosensory channel likely uses an intensity code for vibrotactile texture information.