Binocular contributions to motion detection and motion discrimination during locomotion

PLoS One. 2024 Dec 20;19(12):e0315392. doi: 10.1371/journal.pone.0315392. eCollection 2024.

Abstract

During locomotion, the visual system can factor out the motion component caused by observer locomotion from the complex target flow vector to obtain the world-relative target motion. This process, which has been termed flow parsing, is known to be incomplete, but viewing with both eyes could potentially aid in this task. Binocular disparity and binocular summation could both improve performance when viewing with both eyes. To separate the binocular disparity and binocular summation and analyse how they affect flow parsing, we tested detection and discrimination thresholds under three viewing conditions: stereoscopic, synoptic (binocular but without disparity) and monocular. Experiment 1 tested motion detection during simulated forward self-motion and when stationary. Experiment 2 and 3 tested motion discrimination in forward and backward self-motion and stationary conditions. We found that binocular disparity significantly improved detection thresholds and discrimination biases, at the cost of lower precision. Binocular summation only significantly improved detection thresholds when stationary. It did not significantly affect detection thresholds during locomotion, discrimination biases, or discrimination precisions. Our results indicated that both binocular summation and binocular disparity contribute to motion detection and motion discrimination, but they affect performance differently while stationary and during locomotion.

MeSH terms

  • Adult
  • Female
  • Humans
  • Locomotion* / physiology
  • Male
  • Motion Perception* / physiology
  • Photic Stimulation
  • Vision Disparity / physiology
  • Vision, Binocular* / physiology
  • Young Adult

Grants and funding

This study was supported by a grant from the Natural Sciences and Engineering Research Council of Canada (RGPIN-2020-06061). The funders had no role in the design, data collection, data analysis, decision to publish, or preparation of the manuscript.