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Estimating Vestibular Perceptual Thresholds Using a Six-Degree-Of-Freedom Motion Platform
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Visual motion detection thresholds can be reliably measured during walking and standing.

Stephen DiBianca1, John Jeka1, Hendrik Reimann1

  • 1Coordination of Balance and Posture, Kinesiology and Applied Physiology, Biomechanics and Movement Science, University of Delaware, Newark, DE, United States.

Frontiers in Human Neuroscience
|November 29, 2023
PubMed
Summary

Visual motion detection thresholds can be reliably measured during standing and walking. These thresholds, crucial for balance control, were found to be significantly higher when walking compared to standing.

Keywords:
psychophysicssensory thresholdstandingvisionvisual motion detectionwalking

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Area of Science:

  • Human sensorimotor control
  • Perception and psychophysics
  • Biomechanics and locomotion

Background:

  • Upright balance relies on integrating visual, vestibular, and somatosensory cues.
  • While vestibular and somatosensory links to balance are known, the impact of visual motion detection on upright balance control requires further investigation.
  • Current methods for measuring visual motion thresholds often occur in seated, head-fixed conditions, limiting ecological validity.

Purpose of the Study:

  • To determine if visual motion detection thresholds can be reliably measured during dynamic activities like standing and walking.
  • To investigate whether these thresholds differ between standing and walking conditions.
  • To assess the reliability and consistency of these measurements in the presence of self-motion.

Main Methods:

  • Twenty-nine participants performed a visual motion discrimination task on an instrumented treadmill within a virtual reality environment.
  • An adaptive staircase algorithm presented rotating visual scenes to estimate detection thresholds.
  • Psychometric functions were fitted to binary responses to quantify visual motion detection thresholds during self-paced standing and walking.

Main Results:

  • Reliable and repeatable measurements of visual motion detection thresholds were achieved during both standing and walking.
  • Strong correlations were observed between repeated measurements in both conditions (standing R=0.73, walking R=0.84).
  • Average visual motion detection thresholds were significantly higher during walking (1.04°) compared to standing (0.73°).

Conclusions:

  • Visual motion detection thresholds are reliably measurable during upright standing and walking, even with natural self-motion.
  • The findings indicate that higher visual motion detection thresholds are associated with walking.
  • This suggests that dynamic locomotion influences visual motion perception thresholds relevant to balance control.