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From Hubbard & Ramachandran (2005): [...] the estimated prevalence of synesthesia has varied dramatically, between as many as 1 in 20 (Galton, 1883) and as few as 1 in 25,000 (Cytowic, 1989). The most widely cited study to date suggests that synesthesia occurs in at least 1 in 2000 people (Baron-Cohen et al., 1996), although this is now generally ...


5

You can induce weak/artificial synesthesia on yourself, you cannot induce strong synesthesia on yourself. The type of synesthesia you describe is the same type that Ramachandran mentions when hypothesizing that synesthesia is not a legitimate sensory experience: "Could we be absolutely sure that this wasn't happening because early in kindergarten she had ...


5

After a fair amount of research, I came across Noam Sagiv, PhD, a professor at the Centre for Cognition and Neuroimaging who has done research into synesthesia, including visual-gustatory synesthesia (the proper term for seeing-tasting synesthesia). I contacted him about this and he said the following (reproduced with permission): I can understand your ...


4

The wikipedia Article on Synesthesia cites some prevalence studies Random population studies ... determined that 1 in 23 individuals have some kind of synesthesia, while 1 in 90 have colored graphemes (Simmer et al 2006). Colored days of the week and colored graphemes are the most common types(Simmer et al 2006; Campen, 1999). References Simner ...


3

Nick's answer links to the very interesting geometrical discussion by the authors, but they leave out some background. The color after-image phenomena is best described by opponent-process theory. The basic idea is that the neural systems representing color have a competitive nature. So the system that codes for red and green is the same system and cannot ...


2

You ask "if there is a more mundane explanation" and note that you're "not looking for a diagnosis." As you'd expect of course, it seems sensible to conclude that indeed no definitive judgement can be made about the cause of your experiences without some sort of professional assessment. And there are methods available to attempt to make such a ...


2

Very cool image! As for your question, your link includes a link to the authors' poster, which allows you to "read more about the illusion and possible explanations." From the poster: In conclusion, the observations so far suggest that the afterimage effect is not due to higher level effects of shape-specific coloured afterimages but rather to a rapid ...


1

To whatever extent colorblindness is a consequence of sensation loss, perceptual loss should necessarily follow. If colorblindness results from diabetes solely due to retinal damage, this means diabetes prevents these two colors from causing different sensory stimulation. If the sensory stimulation is truly the same, it should be perceived the same. A signal ...



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