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Geometrical haptic illusions revisited: haptic illusions compared with visual illusions
1Department of Psychology, Faculty of Humanities, Niigata University, Japan.
Perception & Psychophysics
|September 1, 1992
Summary
Haptic illusions, or touch-based misperceptions, do not occur in all geometrical optical illusions. This study found that haptic processing differs from visual processing, suggesting it
Area of Science:
- Psychology
- Neuroscience
- Perception
Background:
- Previous research suggested haptic illusions occur in nearly all geometrical optical illusions.
- The role of visualization in haptic perception remains debated.
Purpose of the Study:
- To re-examine seven geometrical illusions in both haptic and visual modes.
- To investigate the occurrence and characteristics of haptic illusions compared to visual illusions.
Main Methods:
- Seven standard geometrical illusions were presented in both tactile (haptic) and visual formats.
- Participants' perception of illusions was recorded for each modality.
Main Results:
- Equivalent haptic illusions were found for Müller-Lyer, Ponzo, and vertical-horizontal figures.
- A similar haptic illusion was observed in the Oppel-Kundt figure.
- The Delboeuf illusion showed size effects for the outer, but not inner, circle haptically. No haptic illusion was found for the Poggendorff figure. The Zöllner figure produced a haptic illusion opposite in direction to the visual illusion.
Conclusions:
- Haptic illusions are not universally present across all geometrical optical illusions.
- Haptic processing of geometrical figures can occur independently of visualization.
- Tactile perception of these illusions often differs significantly from visual perception.