Synesthete.org is a website that has a series of online tests where you can test yourself for synaesthesia – the condition where senses are crossed so, for example, you might be able to taste shapes or see colours associated with specific numbers.
The site is run by the Eagleman Lab at the Baylor College of Medicine who study links between perception and action, as well as the curious world of synaesthesia.
If you’re a researcher, you can also use the site to test and collect results on your own participants, and the same tests are also available as downloadable software for the Matlab package.
It’s now known that synaesthesia is partly inherited, so if you find that you or one of your family members seems to have the condition, others in the family may also have similar abilities.
Link to synesthete.org.