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Aging changes 3D perception: Evidence for hemispheric rebalancing of lateralized processes.
Bridget Andrews1, Giovanni d'Avossa1, Ayelet Sapir1
1School of Psychology, Bangor University, Bangor, UK.
Neuropsychologia
|March 7, 2017
Summary
Aging reduces the bias for assuming light sources are on the left when interpreting 3D shapes from shaded images. This age-related change in visual perception may reflect diminished hemispheric lateralization.
Area of Science:
- Visual Perception
- Cognitive Neuroscience
- Human Aging
Background:
- Young observers exhibit a leftward bias in assumed light source direction for 3D shape from shading.
- This bias is linked to hemispheric lateralization and experience.
- Aging is associated with reduced hemispheric lateralization.
Purpose of the Study:
- To investigate the impact of aging on the assumed light source direction in 3D shape perception.
- To explore the relationship between age-related changes in visual perception and hemispheric organization.
Main Methods:
- Participants (young and old) judged the 3D shape of shaded images to infer light source direction.
- A line bisection task was used to assess lateralized bias.
- Correlation analysis was performed between assumed light source direction and line bisection bias.
Main Results:
- Older participants showed a reduced leftward bias in assumed light source direction compared to younger participants.
- Greater variability in assumed light source direction was observed in older adults.
- A correlation was found between assumed light source direction and lateralized bias in the line bisection task for both age groups.
Conclusions:
- Diminished hemispheric lateralization with aging may influence the perception of 3D structure from shading.
- Shape from shading perception can serve as a behavioral indicator for age-related changes in hemispheric organization.
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