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Related Experiment Video

Updated: Jun 4, 2025

Applying Incongruent Visual-Tactile Stimuli during Object Transfer with Vibro-Tactile Feedback

Applying Incongruent Visual-Tactile Stimuli during Object Transfer with Vibro-Tactile Feedback

Published on: May 23, 2019

Mirror-invariance is not exclusively visual but extends to touch.

Maksymilian Korczyk¹, Katarzyna Rączy², Marcin Szwed³

¹Department of Psychology, Jagiellonian University, ul. Ingardena 6, 30-060, Kraków, Poland. maksym.korczyk@gmail.com.

Scientific Reports

|December 28, 2024

Summary

Mirror-invariance, the ability to recognize mirrored objects as identical, is overcome by both blind and sighted individuals across tactile and visual modalities. This suggests mirror-invariance is independent of sensory experience.

Keywords:

Braille Congenitally blind individuals Mirror-invariance Reading Shape recognition

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Last Updated: Jun 4, 2025

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Area of Science:

Cognitive Psychology
Neuroscience
Sensory Perception

Background:

Mirror-invariance is an innate bias affecting object recognition.
Reading acquisition requires overcoming mirror-invariance for distinguishing letters like 'd' and 'b'.
Congenital blindness may also involve overcoming mirror-invariance for Braille.

Purpose of the Study:

To investigate mirror-invariance across different sensory modalities (tactile and visual).
To examine how object familiarity modulates mirror-invariance.
To compare mirror-invariance processing in congenitally blind and sighted individuals.

Main Methods:

Same-different judgment tasks were employed.
Participants included congenitally blind and sighted individuals.
Stimuli included letters (Braille, Latin) and non-linguistic objects (geometric figures, everyday items) in identical, mirror, and different orientations.

Main Results:

No group differences in tactile shape judgment for non-linguistic stimuli.
Sighted individuals showed greater expertise for haptic geometric figures than visual ones.
Sighted participants struggled with mirror-inverted Latin letters, unlike blind participants with Braille and non-linguistic stimuli.

Conclusions:

Mirror-invariance appears to be independent of the sensory modality used.
Experience with specific stimuli (e.g., reading, Braille) influences the ability to break mirror-invariance.
The findings contribute to understanding perceptual development and cross-modal plasticity.