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Walking without optic flow reduces subsequent vection.

Takeharu Seno1, Stephen Palmisano, Bernhard E Riecke

  • 1Institute for Advanced Study, Kyushu University, 6-10-1 Hakozaki, Higashi-ku, Fukuoka, 812-8581, Japan, seno@design.kyushu-u.ac.jp.

Experimental Brain Research
|October 3, 2014
PubMed
Summary
This summary is machine-generated.

Walking without visual input temporarily reduces the brain's sensitivity to visual motion cues. This sensory readjustment makes it harder for optic flow to create a sense of self-motion.

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Area of Science:

  • Neuroscience
  • Human Perception
  • Vestibular System

Background:

  • Vection, the illusory sensation of self-motion, is typically induced by visual stimuli like optic flow.
  • The role of prior sensory experiences, particularly proprioceptive input during locomotion, on subsequent vection perception is not fully understood.

Purpose of the Study:

  • To investigate how walking without optic flow influences the induction and strength of visually induced self-motion (vection).
  • To explore the underlying sensory mechanisms that may mediate this effect.

Main Methods:

  • Two groups of participants walked for 5 minutes: one group with normal vision, the other wearing Ganzfeld goggles to block optic flow.
  • Following the walking period, participants were exposed to a radially expanding optic flow stimulus.
  • The onset latency and perceived strength of vection were measured.

Main Results:

  • Participants who walked without optic flow exhibited significantly later onset latencies for vection.
  • The strength of the induced vection was also reduced in the group that experienced walking without optic flow.
  • These findings suggest a transient disruption in the processing of visual motion cues.

Conclusions:

  • Walking without optic flow appears to induce a sensory readjustment in the participants.
  • This readjustment temporarily diminishes the efficacy of optic flow in generating the perception of self-motion.
  • The study highlights the interplay between different sensory modalities in self-motion perception.