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Aging and the perception of texture-defined form
J Farley Norman1, Hannah K Shapiro2, Karli N Sanders2
1Department of Psychological Sciences, Ogden College of Science and Engineering, Western Kentucky University, Bowling Green, Kentucky, USA; Center for Applied Science in Health & Aging, Western Kentucky University, Bowling Green, Kentucky, USA.
Vision Research
|June 6, 2021
Summary
Older adults show impaired ability in discriminating global shapes defined by texture differences. They require significantly larger texture variations than younger adults to perceive object shapes accurately.
Area of Science:
- Visual perception
- Cognitive aging
- Texture discrimination
Background:
- Global shape perception relies on integrating local features.
- Texture-defined shapes are crucial for object recognition in natural environments.
- Age-related changes in visual processing can impact shape discrimination abilities.
Purpose of the Study:
- To investigate age-related differences in discriminating texture-defined global shapes.
- To quantify the impact of aging on the perception of shape from texture.
- To determine the extent to which older adults' texture discrimination is impaired compared to younger adults.
Main Methods:
- Utilized 3-point micropattern textures to define global shapes (rectangles).
- Manipulated task difficulty by varying the deviation from colinearity between figure and background texture elements.
- Compared discrimination performance (d-prime values) between younger and older observer groups.
Main Results:
- Older observers required 54.4% larger deviations from colinearity to achieve reliable shape discrimination compared to younger observers.
- A substantial age effect was observed, indicating significant impairment in older adults.
- Performance improved with larger differences in texture deviation for both age groups.
Conclusions:
- Older adults can perceive global shapes from texture, but this ability is significantly impaired.
- Age-related deficits in visual processing affect the integration of local texture elements for global shape perception.
- Future research should explore compensatory strategies or interventions to mitigate age-related declines in texture-defined shape discrimination.
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