Ebbinghaus Illusion
Judge the relative size of a central circle surrounded by either larger or smaller flanking circles. The central circle appears smaller when flanked by larger circles, larger when flanked by smaller ones. Reveals contextual size-contrast effects in visual perception.
- Perception
Indexed implementations 2
Metadata only — each row links to the authors' own page. A date in the last column is the last time an automated check confirmed the link loads; it is not a review of the task.
| Implementation | Source | Languages | Link checked |
|---|---|---|---|
| Ebbinghaus Illusion · Labvanced Samples | Labvanced samples | English | 2026-05-13 |
| Ebbinghaus · jsPsych Demos | jsPsych demos | English | 2026-05-28 · not launch-checked |
Key references
- Coren, S., & Enns, J. T. (1993). Size contrast as a function of conceptual similarity between test and inducers. Perception & Psychophysics, 54(5), 579–588. doi:10.3758/bf03211782