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Enhanced optic flow speed discrimination while walking: contextual tuning of visual coding.

Frank H Durgin1, Krista Gigone

  • 1Department of Psychology, Swarthmore College, 500 College Avenue, Swarthmore, PA 19081, USA. fdurgin1@swarthmore.edu

Perception
|February 13, 2008
PubMed
Summary
This summary is machine-generated.

Walking enhances our ability to judge visual speeds by adapting how we process optic flow. This multisensory adaptation improves speed discrimination, especially for speeds encountered during locomotion.

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Area of Science:

  • Perception and Cognitive Neuroscience
  • Human Motor Control
  • Sensory Integration

Background:

  • Self-motion perception relies on integrating various sensory inputs, including visual optic flow.
  • Adaptation to consistent multisensory contingencies can alter perceptual processing.
  • The relationship between walking and optic flow perception is not fully understood.

Purpose of the Study:

  • To investigate whether long-term adaptation to walking influences the discrimination of visual speeds.
  • To determine if the multisensory context of walking enhances optic flow speed perception.

Main Methods:

  • Used a two-interval forced-choice procedure to compare perceived visual flow speed during walking versus standing.
  • Measured optic flow speed discrimination thresholds in both walking and standing conditions.
  • Employed simulated visual flow fields to control visual stimuli.

Main Results:

  • Perceived visual flow speed was reduced when participants were walking compared to standing.
  • Optic flow speed discrimination was enhanced for speeds near typical walking speeds when participants were walking.
  • Sensitivity for discriminating slower visual speeds decreased during walking.

Conclusions:

  • The multisensory experience of walking recalibrates the processing of optic flow.
  • This adaptation enhances the precision of visual speed perception within the ecologically relevant range of self-motion.
  • Optimal coding principles likely explain the enhanced discrimination during walking.