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Optic flow is calibrated to walking effort.

Jonathan R Zadra1, Dennis R Proffitt2

  • 1Department of Psychology, University of Utah, Salt Lake City, UT, USA. j.zadra@utah.edu.

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|March 26, 2016
PubMed
Summary
This summary is machine-generated.

People learn walking magnitude from optic flow. This study suggests walking distance is measured in bioenergetic units, not speed, impacting perception and behavior.

Keywords:
Embodied cognitionPerceptionPerceptual learningPhysiological psychologyVisual

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Area of Science:

  • Human perception
  • Motor control
  • Bioenergetics

Background:

  • Humans learn to associate walking effort with optic flow.
  • Altering this relationship impacts behavior and perception.
  • Previous research used walking speed to measure walking magnitude.

Purpose of the Study:

  • To investigate if walking magnitude is measured in bioenergetic units rather than walking speed.
  • To test the hypothesis that energy expenditure, not just speed, calibrates walking perception.

Main Methods:

  • Experiment 1: Manipulated walking energy (treadmill incline) while keeping walking speed and optic flow constant.
  • Experiment 2: Used a virtual reality environment to present optic flow, controlling for biomechanical differences.
  • Measured subsequent self-motion perception (forward drift) and perceived walking distance.

Main Results:

  • Participants walking on inclined treadmills (higher energy cost) drifted farther when blindfolded.
  • No difference in drift was observed when optic flow was presented virtually, ruling out biomechanical artifacts.
  • Perceived walking distance was recalibrated based on learned walking-optic flow relationships.

Conclusions:

  • Walking magnitude appears to be scaled by bioenergetic units (energy expenditure).
  • This finding challenges the traditional view of walking magnitude being solely based on speed.
  • Bioenergetic cost is a critical factor in how the brain calibrates locomotion and perceives distance.