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Related Experiment Videos

The Bourdon illusion in haptic space.

R H Day1

  • 1Department of Psychology, Monash University, Clayton, Victoria, Australia.

Perception & Psychophysics
|April 1, 1990
PubMed
Summary
This summary is machine-generated.

The Bourdon illusion, perceived bentness of straight lines, occurs in active touch. Reversing object components reversed the haptic illusion, suggesting a shared perceptual mechanism with vision.

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Area of Science:

  • Psychology
  • Neuroscience
  • Haptics

Background:

  • The Bourdon illusion is a visual phenomenon where straight lines appear bent.
  • Active haptic perception involves exploring objects through touch and movement.

Purpose of the Study:

  • To investigate the presence and characteristics of the Bourdon illusion in the active haptic mode.
  • To compare the haptic Bourdon illusion with its visual counterpart.

Main Methods:

  • Two experiments were conducted with blindfolded subjects.
  • Subjects actively moved their fingers across objects with specific frontal profiles.

Main Results:

  • A strong Bourdon illusion was observed in the active haptic mode.

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  • Reversing the object's components altered the illusion's direction and magnitude, mirroring visual results.

    • Conclusions:

    • The active haptic Bourdon illusion is fundamentally similar to the visual Bourdon illusion.
    • A perceptual compromise between surface orientation and object structure explains the haptic illusion.