Now that I have read all the comments on the linked blog post I have some thoughts to share that I want to have judged seperately.

From user "seez"

Some people can differentiate between orders of magnitude more colors than other people. You can test yourself here: http://www.apartmenttherapy.com/how-well-do-you-see-color-173018

I once had a long argument with a group of friends about why vision was more interesting than sound. Turns out all the ones who sided with vision could differentiate between far more colors.

This seems like it would be easy to test. What is the relevant literature to design a suitable experiment for this?

You can also test if you’re tonedeaf: http://jakemandell.com/tonedeaf/

Similar to the other case, I would like to test for a correlation between enjoyment of music and this. I am not sure what the practical use of this data is but I am interested in it anyway.

From user "St. Rev"

I can’t smell jasmine. I didn’t discover this until I was in my thirties and someone handed me a twig of jasmine flowers. My sense of smell is otherwise better than normal.

From user "Alicorn"

I’m a little bit faceblind (but not as bad as some people, like Leah).

From user "lmm"

This makes me wonder whether there are people who actually get emotionally affected by art, in the same way as I do with music. I enjoy art on an intellectual level, but I’ve never looked at a painting and had it make me feel sad or transcendent or any of the reactions people tend to talk about.

Reading these I wonder about how these discrepancies arise. Are they usually genetic in nature as in that some genetic factor determines certain neurological structures or are they the result of some environmental factor too? The jasmin example sounds more like a defective connection between the brain and receptors in the nose. Then again, only some part of the population is able to smell some metabolic product of asparagus in urine and we know this is a single gene mutation. The faceblind example sounds like some environmental factor being absent such as plenty of faces. The art experience thing I don't know.

Do high IQ people have more of these unusual structures? In my experience more intelligent people report such strange stuff more often and/or are able to empathise with me more. Then again, it could be that intelligent people in general are just more aware of these things and such more considerate.

Anyway I am very happy to see that other people have plenty of these little stuffs and I am not alone in this. I am very happy to be able to participate in this community.