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Joseph Delboeuf on visual illusions: a historical sketch
1Université de Paris V (René Descartes) et EPHE, Laboratorie de Psychologie Expérimentale, CNRS-URA 316, Centre Henri-Piéron, Paris, France.
The American Journal of Psychology
|January 1, 1995
Summary
The Delboeuf illusion, concerning perceived circle size, was first presented in 1865, not the commonly cited 1890s. This study corrects historical inaccuracies and analyzes Delboeuf
Area of Science:
- Visual Perception
- Psychophysics
- History of Science
Background:
- The Delboeuf illusion describes how the perceived size of a central circle is altered by a concentric surrounding circle.
- A common misconception attributes the initial presentation of the Delboeuf illusion to 1892 or 1893, contradicting historical records.
Discussion:
- This study critically examines Delboeuf's original 1865 and 1892 publications on visual illusions.
- Analysis of Delboeuf's data is contextualized with contemporary findings on concentric circle illusions.
- The research addresses and rectifies widespread misinterpretations of Delboeuf's seminal work.
Key Insights:
- The Delboeuf illusion was definitively introduced and analyzed in 1865, not in later publications.
- Historical misattribution stems from misreadings of Delboeuf's original scientific contributions.
Outlook:
- Clarifying the historical timeline of the Delboeuf illusion provides a more accurate foundation for future research.
- Re-evaluation of historical data in light of current understanding can refine theories of visual perception.