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Updated: Jan 23, 2026

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Quadruple-Checkerboard: A Modification of the Three-Dimensional Checkerboard for Studying Drug Combinations
Published on: July 24, 2021
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Rotating dual-layered checkerboard illusion
Kentaro Usui1, Masaya Ishikawa2, Shuichiro Taya3
1Graduate School of Human Science, Ritsumeikan University, Japan.
I-Perception
|January 22, 2026
Summary
A novel visual illusion shows a rotating checkerboard appearing to morph into a circle. This phenomenon, a breathing illusion (BI) subtype, offers new insights into BI mechanisms.
Area of Science:
- Visual Perception
- Psychophysics
- Cognitive Neuroscience
Background:
- The breathing illusion (BI) describes visual phenomena where static images appear to expand and contract.
- Existing BI displays have limitations in fully explaining underlying perceptual mechanisms.
Purpose of the Study:
- To introduce and characterize a novel visual illusion with potential implications for understanding the breathing illusion.
- To investigate unique features of this illusion that may extend current knowledge of BI mechanisms.
Main Methods:
- Presentation of a novel visual stimulus: a 2x2 two-colored checkerboard square rotating against an identical background.
- Phenomenological observation and categorization of the illusion's characteristics.
- Comparison with existing breathing illusion displays and theoretical frameworks.
Main Results:
- The rotating checkerboard stimulus was observed to perceptually morph into a circle, accompanied by a perceived size change.
- The illusion shares phenomenological similarities with known breathing illusions, suggesting it as a subtype.
- The illusion presents unique characteristics not fully explained by current BI models.
Conclusions:
- A novel visual illusion, potentially a subtype of the breathing illusion, has been identified.
- This illusion provides a new avenue for exploring the complex mechanisms underlying the breathing illusion.
- Further research into this phenomenon could refine our understanding of visual perception and illusory effects.
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