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Changes in low-level neural properties underlie age-dependent visual decision making.

Elahe Arani¹, Raymond van Ee^2,3,4, Richard van Wezel^2,5

¹Biophysics Department, Donders Institute for Brain, Cognition and Behaviour, Radboud University, 6525AJ, Nijmegen, The Netherlands. E.arani@donders.ru.nl.

Scientific Reports

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Summary

Aging affects visual perceptual decisions, particularly the variability in percept durations and alternation rates. Changes in neural adaptation and noise, not inhibition, underlie these age-related cognitive declines.

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Area of Science:

Neuroscience
Cognitive Psychology
Gerontology

Background:

Aging is associated with cognitive decline, impacting perceptual decision-making.
The specific neurobiological mechanisms driving age-related changes in perception remain unclear.

Purpose of the Study:

To investigate the effects of aging on perceptual decision-making and binocular rivalry.
To elucidate the neurobiological underpinnings of age-associated alterations in visual perception.

Main Methods:

Two age groups performed perceptual tasks under continuous and intermittent stimulus presentation.
Participants reported spontaneous percept switches and made choices during binocular rivalry.

Main Results:

No significant age effect was found on the mean or cumulative frequencies of percept switch durations.
A significant age effect emerged in the coefficient of variation of percept durations.
Older adults showed a decline in percept alternation rate under intermittent presentation, especially with shorter inter-stimulus durations.

Conclusions:

Age-dependent changes in visual perceptual decisions are attributed to alterations in neural adaptation and noise levels.
Inhibition strength does not appear to be the primary factor in age-related perceptual decline.
Low-level neural property variations significantly influence age-dependent visual perception.