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Feature tracking and aging.

Rémy Allard¹, Sarah Lagacé-Nadon, Jocelyn Faubert

¹Visual Psychophysics and Perception Laboratory, School of Optometry, Université de Montréal Montréal, QC, Canada.

Frontiers in Psychology

|July 23, 2013

Summary

Aging significantly impairs second-order motion processing, which involves tracking visual features. This study used fractal rotation stimuli to demonstrate age-related deficits in feature tracking across all temporal frequencies.

Keywords:

aging feature tracking fractal rotation motion second-order motion

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Area of Science:

Visual neuroscience
Human aging research
Perceptual science

Background:

Conflicting findings exist on how aging affects second-order motion perception.
Previous studies used contrast-defined stimuli, potentially confounding results due to age-related contrast sensitivity loss.
The specific motion processing system (low-level vs. high-level) for contrast-defined stimuli can vary.

Purpose of the Study:

To investigate the impact of aging on second-order motion processing, independent of contrast sensitivity.
To clarify age-related changes in visual motion perception using a novel stimulus.
To determine if aging affects high-level feature tracking mechanisms.

Main Methods:

Utilized fractal rotation as a second-order motion stimulus, avoiding high spatial frequencies.
Employed stimuli known to be processed by a high-level feature tracking system.
Compared first-order and second-order motion processing across various temporal frequencies in aging individuals.

Main Results:

An age-related deficit in second-order motion processing was observed across all tested temporal frequencies.
This deficit was present even at frequencies where first-order motion processing showed no age-related decline.
Findings suggest a specific impairment in the ability to track visual features with age.

Conclusions:

Aging significantly impacts second-order motion processing, specifically the ability to track visual features.
The use of fractal rotation provides a clearer measure of age-related deficits in high-level motion perception.
Results reconcile previous conflicting findings by isolating the effects on feature tracking.