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Reaction time for peripheral visual field increases during stepping task in older adults
Kazuki Uemura1, Minoru Yamada, Koutatsu Nagai
1Department of Physical Therapy, Graduate School of Medicine, Nagoya University, Daikouminami, Higashi-ku, Nagoya, Japan. kazuki.uemura@gmail.com
Aging Clinical and Experimental Research
|December 15, 2012
Summary
Older adults showed slower reaction times in peripheral vision during stepping tasks compared to young adults. This suggests their effective visual field may shrink during physical activity, impacting safe locomotion.
Area of Science:
- Gerontology
- Human Movement Science
- Visual Neuroscience
Background:
- Safe locomotion relies on visual attention to both central and peripheral visual fields.
- Understanding age-related changes in visual processing during movement is crucial for fall prevention.
Purpose of the Study:
- To investigate the impact of a stepping task on visual reaction times in central and peripheral fields.
- To compare these effects between young and older adults.
Main Methods:
- Reaction times were measured in 9 older (mean age 83.8 years) and 11 young adults (mean age 22.9 years).
- Participants responded to visual stimuli in central and peripheral fields under static standing and stepping conditions.
Main Results:
- Older adults exhibited significantly longer reaction times at a 45° vision angle during stepping compared to static standing.
- Reaction time in older adults was significantly associated with vision angle and condition (p=0.006).
- Young adults' reaction times were only affected by vision angle.
Conclusions:
- The effective visual field may be reduced in older adults during low-intensity exercise.
- Age-related declines in visual processing during movement could compromise balance and mobility.
