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Illusory Motion Reversal in Touch.

Yu-Chun Hsu1,2,3,4,5, Chun-I Yeh2,3,4, Jian-Jia Huang5,6,7

  • 1Institute of Neuroscience, National Yang-Ming University, Taipei, Taiwan.

Frontiers in Neuroscience
|July 2, 2019
PubMed
Summary
This summary is machine-generated.

Tactile illusory motion reversal (IMR) occurs when perceived motion direction is opposite to actual motion. Stimulus characteristics like spatial period, speed, and pattern type significantly influence IMR magnitude.

Keywords:
illusionperceptionperceptual rivalrysomatosensorytouch

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Area of Science:

  • Neuroscience
  • Psychophysics
  • Somatosensory system

Background:

  • Illusory motion reversal (IMR) is a known visual phenomenon.
  • Tactile IMR has been reported, but the influencing stimulus characteristics are not well understood.

Purpose of the Study:

  • To investigate how stimulus characteristics affect the magnitude of tactile illusory motion reversal.
  • To identify optimal parameters for inducing tactile IMR.

Main Methods:

  • 10 participants received tactile stimuli on their fingerpads.
  • Stimuli included moving sinusoidal gratings and random-dot patterns at varying spatial periods, speeds, and indentation depths.

Main Results:

  • Tactile IMR was perceived by all participants.
  • The illusion was more pronounced at spatial periods of 1-2 mm and extreme speeds (20 and 320 mm/s).
  • Sinusoidal gratings elicited stronger IMR than random-dot patterns, suggesting edge orientation is a key factor.

Conclusions:

  • Optimal parameters for tactile IMR align with characteristics of motion-selective neurons in the somatosensory cortex.
  • Orientation-selective neurons in the somatosensory cortex may underlie tactile IMR.