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Stimulus contrast, pursuit mode, and age strongly influence tracking performance on a continuous visual tracking

A C L Vrijling1, M J de Boer2, R J Renken3

  • 1Laboratory of Experimental Ophthalmology, University Medical Center Groningen, University of Groningen, Groningen, the Netherlands; Royal Dutch Visio, Centre of Expertise for Blind and Partially Sighted People, Huizen, the Netherlands.

Vision Research
|February 11, 2023
PubMed
Summary

Tracking moving objects is a natural human ability that can screen vision. Higher stimulus contrast and specific movement types improve tracking, but older adults need more contrast. This research informs new visual screening tools.

Keywords:
Continuous stimulus trackingEye movementsPsychophysicsVisual fieldWeber contrast

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Area of Science:

  • Vision science
  • Human psychophysics
  • Ophthalmology

Background:

  • Human observers naturally track moving visual stimuli.
  • Tracking performance can indicate visual function, but is sensitive to stimulus contrast and movement type.
  • Understanding how age, contrast, and movement affect tracking is crucial for developing sensitive visual screening methods.

Purpose of the Study:

  • To investigate the effects of age, stimulus contrast, and movement type (smooth pursuit vs. saccadic pursuit) on continuous visual tracking performance.
  • To determine the relationship between tracking performance and static contrast thresholds (foveal and peripheral).
  • To provide insights for developing intuitive and sensitive visual function screening tools.

Main Methods:

  • Evaluated tracking performance in 20 younger and 20 older adults using a semi-randomly moving stimulus (Goldmann size III).
  • Tested five contrast levels (5%-80%) and two movement modes: smooth pursuit and saccadic pursuit.
  • Assessed static foveal and peripheral contrast thresholds for comparison.

Main Results:

  • Tracking performance improved with increasing contrast for all participants in both pursuit modes.
  • Older participants required approximately double the contrast of younger participants to reach threshold performance.
  • Saccadic pursuit detection thresholds correlated with static peripheral contrast thresholds, while smooth pursuit thresholds did not correlate with static foveal thresholds.

Conclusions:

  • Continuous visual tracking is significantly influenced by stimulus contrast, movement type, and age.
  • Age-related differences in contrast sensitivity impact tracking performance, particularly in saccadic pursuit.
  • Findings support the development of contrast-dependent, movement-based visual screening methods.