Contrast Illusions and Geometry: Continuing with a Visual Illusion Experiment – Part 10

multicontrastao

In the last post we looked at the a number of images and altered single characteristics to assess the impact on the contrast illusion. The hypothesis generated was that the letter A when compared to a filled circle could with a graded background produce the illusion of heterogeneity within the same shape (i.e within the letter A). The underlying assumption was that the geometry of the letter A would impact on the perception of contrasting colours in the background and foreground to produce the illusion of variegation. The above diagram was created to test this hypothesis. A cursory examination of the diagram suggests that the hypothesis is incorrect. Nevertheless the more general contrast illusion persists. Both the A’s and the solid filled circles appear lighter on the right than on the left.

Appendix

Explaining the Neurobiology of Illusions – A Talk from Caltech

Do Cats See Illusions Too?

A Visual Illusion Experiment – Part 9

A Visual Illusion Experiment – Part 8

A Visual Illusion Experiment – Part 7

A Visual Illusion Experiment – Part 6

A Visual Illusion Experiment – Part 5

A Visual Illusion Experiment – Part 4

A Visual Illusion Experiment – Part 3

A Visual Illusion Experiment – Part 2

A Visual Illusion Experiment – Part 1

Index: There are indices for the TAWOP site here and here Twitter: You can follow ‘The Amazing World of Psychiatry’ Twitter by clicking on this link. Podcast: You can listen to this post on Odiogo by clicking on this link (there may be a small delay between publishing of the blog article and the availability of the podcast). It is available for a limited period. TAWOP Channel: You can follow the TAWOP Channel on YouTube by clicking on this link. Responses: If you have any comments, you can leave them below or alternatively e-mail justinmarley17@yahoo.co.uk. Disclaimer: The comments made here represent the opinions of the author and do not represent the profession or any body/organisation. The comments made here are not meant as a source of medical advice and those seeking medical advice are advised to consult with their own doctor. The author is not responsible for the contents of any external sites that are linked to in this blog.

One thought on “Contrast Illusions and Geometry: Continuing with a Visual Illusion Experiment – Part 10

  1. Pingback: Intermezzo: A Visual Illusion Experiment – Part 11 | The Amazing World of Psychiatry: A Psychiatry Blog

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