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Related Experiment Videos

Effect of aging on visual shape distortion.

Josée Rivest1, Ji Soo Kim, James Intriligator

  • 1Department of Psychology, Glendon College, York University, Toronto, Ontario, Canada. jrivest@yorku.ca

Gerontology
|April 29, 2004
PubMed
Summary
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The shape distortion effect, a visual illusion, diminishes with age. This suggests age-related decline in processing complex shape interactions, not basic shape perception.

Area of Science:

  • Visual perception
  • Cognitive aging
  • Human psychophysics

Background:

  • The shape distortion effect is a visual illusion where a prime shape distorts the perception of a subsequent test shape.
  • While aging affects visual perception, its impact on the shape distortion effect remains unstudied.

Purpose of the Study:

  • To investigate the influence of aging on the shape distortion effect.
  • To compare age-related changes in shape distortion perception versus elementary shape perception.

Main Methods:

  • Assessed shape distortion effect and elementary shape perception in 29 healthy adults (18-83 years).
  • Utilized a visual paradigm with prime-test shape presentations and measured ellipse elongation using the method of adjustment.

Main Results:

Related Experiment Videos

  • Perception of elementary shapes showed no age-related changes.
  • The shape distortion effect significantly decreased with increasing age in both intra- and interhemifield conditions.
  • The effect was more pronounced in the intrahemifield condition.

Conclusions:

  • Advancing age reduces the shape distortion effect, indicating age-related decline in processing shape interactions.
  • Perception of elementary shapes remains stable with age.
  • Cerebral processing of shape interaction is more vulnerable to aging than elementary shape perception.