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Age-related hemispheric asymmetry in object discrimination
P Gerhardstein1, M A Peterson, S Z Rapcsak
1Department of Psychology, University of Arizona, Tucson, USA. gerhard@binghamton.edu
Journal of Clinical and Experimental Neuropsychology
|October 20, 1998
Summary
Older adults show declines in visual processing, particularly in the left visual field (LVF) which is processed by the right hemisphere (RH). This suggests age-related cognitive decline disproportionately affects the right hemisphere.
Area of Science:
- Cognitive Neuroscience
- Gerontology
- Visual Perception
Background:
- Age-related cognitive decline affects various sensory processing functions.
- Hemispheric asymmetries in cognitive aging are not fully understood.
- Visual processing speed and accuracy can be impacted by aging.
Purpose of the Study:
- To investigate age-related differences in visual processing across visual fields.
- To examine potential hemispheric asymmetries in cognitive decline in older adults.
- To compare visual discrimination abilities between young and elderly observers.
Main Methods:
- Participants (young and elderly) judged same/different image pairs presented sequentially in the left visual field (LVF) or right visual field (RVF).
- Stimuli were objects from the same category, varying in viewpoint or exemplar.
- Sensitivity was measured across visual fields and hemispheres (LVF-RH, RVF-LH).
Main Results:
- Young observers demonstrated consistent visual sensitivity across both visual fields.
- Elderly observers exhibited lower overall sensitivity compared to young observers.
- Elderly observers were less sensitive to stimuli in the LVF (processed by the RH) than in the RVF (processed by the LH).
Conclusions:
- Visual cognitive functioning declines with age.
- This decline appears to be more pronounced in the right hemisphere compared to the left hemisphere.
- Findings support a hypothesis of faster age-related decline in right-hemisphere visual processing.