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A NOVEL METHOD FOR QUANTIFYING MOTION DETECTION IN THE PRESENCE OF GLARE

Abstract

Motion perception is a fundamental aspect of vision, yet sources of individual variability in this ability remain poorly understood. Our laboratory created a novel measure of motion perception called motion detection resiliency (MDR). This is a measure of the threshold at which a veiling broadband light obscures a moving target. Participants (N = 20; 18-29 years, M =20.65 ± 3.10 years) were measured on the MDR device without any lens (baseline), with a clear lens, and with a shortwave-filtering lens. We observed substantial individual differences in MDR among participants with comparable visual acuity and ocular health, underscoring that this measure captures variation not explained by standard clinical assessments. Baseline MDR scores were significantly related to the amount of improvement in their motion detection threshold granted by added shortwave filtration (r(18) = -0.59, p = .006). These results support the validity of MDR as a metric for quantifying motion perception. Further, we anticipated that MDR thresholds would be related to other measures of motion perception. To that end, thresholds for flicker perception were measured in the same participants using the psychophysical method of limits. This flicker threshold (in Hertz) represents the upper temporal limits of motion detection, whereas MDR scores assessed motion detection using a slower target (45.76 degrees of retinal eccentricity/second). There was a trend towards significance in the moderate relationship between flicker thresholds and MDR scores (r(18) = -0.42, p = .07). The trend between MDR and flicker thresholds suggests that MDR may represent an individual's general ability to detect motion. Taken together, these findings highlight MDR as a novel and promising measure of motion perception that may offer new insights into visual performance in demanding environments.

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