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Effects of cortical distance on the Ebbinghaus and Delboeuf illusions
| Content Provider | SAGE Publishing |
|---|---|
| Author | Poutasi W. B. Urale Schwarzkopf, Dietrich Samuel |
| Copyright Year | 2023 |
| Abstract | The Ebbinghaus and Delboeuf illusions affect the perceived size of a target circle depending on the size and proximity of circular inducers or a ring. Converging evidence suggests that these illusions are driven by interactions between contours mediated by their cortical distance in primary visual cortex. We tested the effect of cortical distance on these illusions using two methods: First, we manipulated retinal distance between target and inducers in a two-interval forced choice design, finding that targets appeared larger with a closer surround. Next, we predicted that targets presented peripherally should appear larger due to cortical magnification. Hence, we tested the illusion strength when positioning the stimuli at various eccentricities, with results supporting this hypothesis. We calculated estimated cortical distances between illusion elements in each experiment and used these estimates to compare the relationship between cortical distance and illusion strength across our experiments. In a final experiment, we modified the Delboeuf illusion to test whether the influence of the inducers/annuli in this illusion is influenced by an inhibitory surround. We found evidence that an additional outer ring makes targets appear smaller compared to a single-ring condition, suggesting that near and distal contours have antagonistic effects on perceived target size. |
| Related Links | https://journals.sagepub.com/doi/pdf/10.1177/03010066231175014?download=true |
| Starting Page | 459 |
| Ending Page | 483 |
| Page Count | 25 |
| ISSN | 03010066 |
| Issue Number | 7 |
| Volume Number | 52 |
| Journal | Perception (PEC) |
| e-ISSN | 14684233 |
| DOI | 10.1177/03010066231175014 |
| Language | English |
| Publisher | Sage Publications UK |
| Publisher Date | 2023-06-19 |
| Publisher Place | London |
| Access Restriction | Open |
| Rights Holder | © The Author(s) 2023 |
| Subject Keyword | neural mechanisms perception Ebbinghaus illusion size perception eccentricity Delboeuf illusion crowding |
| Content Type | Text |
| Resource Type | Article |
| Subject | Ophthalmology Experimental and Cognitive Psychology Artificial Intelligence Sensory Systems |
