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Imaging the Aging Cochlea with Light-Sheet Fluorescence Microscopy
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Shape perception is altered by normal aging.

Anne E Weymouth1, Allison M McKendrick

  • 1Department of Optometry and Vision Sciences, The University of Melbourne, Parkville, Victoria, Australia.

Investigative Ophthalmology & Visual Science
|April 26, 2012
PubMed
Summary
This summary is machine-generated.

Aging significantly impairs shape perception, particularly in distinguishing shapes from visual noise. Older adults showed greater difficulty with texture-based shape discrimination compared to recognizing closed shapes.

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Area of Science:

  • Vision science
  • Cognitive aging
  • Perceptual psychology

Background:

  • Aging affects visual processing, including shape perception.
  • The ability to segregate shape from noise may be particularly vulnerable to age-related decline.
  • Previous research suggests older adults struggle with suppressing irrelevant visual information.

Purpose of the Study:

  • To compare the impact of aging on two distinct shape-discrimination tasks: radial frequency (RF) patterns (closed shapes) and Glass patterns (shape from texture).
  • To test the hypothesis that aging impairs shape-from-texture discrimination more than closed-shape discrimination.
  • To investigate age-related deficits in suppressing irrelevant information during contour segmentation.

Main Methods:

  • Recruited 14 younger (19-38 years) and 14 older (62-72 years) adults.
  • Measured contrast-detection thresholds for RF and Glass stimuli.
  • Assessed shape-discrimination performance using stimuli at 5 times individual contrast thresholds, measuring thresholds for RF patterns (triangular vs. square) and Glass patterns (concentric vs. radial).

Main Results:

  • Older adults exhibited significantly elevated shape-discrimination thresholds for both RF patterns (mean older = 27" arc vs. younger = 18" arc) and Glass patterns (mean coherence older = 29% vs. younger = 16%).
  • Age-related deficits were more pronounced in the Glass pattern task (shape from texture) compared to the RF pattern task (closed shapes), as indicated by higher Z-scores for older adults on the Glass task.
  • Statistical analysis confirmed significant differences between age groups for both tasks (p < 0.01 for RF, p < 0.01 for Glass) and a significant difference in the magnitude of impairment between tasks for older adults (p < 0.05).

Conclusions:

  • Shape perception is demonstrably affected by the aging process.
  • Older adults experience greater difficulties in discriminating shapes embedded in texture compared to discriminating simple closed contours.
  • These findings support the hypothesis that age-related declines in suppressing irrelevant information contribute to impaired shape-from-texture perception.