He says when he closes his eyes he sees color. I also see vivid visuals, colors and fractals when I listen to music with my eyes closed but I also see them when there is no music so I don't know. I just assumed this was the case for everyone until I started talking about it and people didn't see them too. I create vivid paintings in my mind as well of people, creatures and places I have never been. These are the types of visuals I will get with my eyes closed but certain medications, like anti-depressants, pain killers or sleeping pills will turn it off.
I have a cross between lexical-gustatory and auditory-tactile synesthesia. It's mild or at least I think it's mild since I really have nothing to compare it to and I rarely talk about it. It just has always been. I do not associate particular colors with sounds or letters like others report though. I really can't say if any of this is Ni related.
http://en.wikipedia.org/wiki/Ideasthesia
http://en.wikipedia.org/wiki/Synesthesia
Based on the findings that synesthesia is not a phenomenon of crossed senses but has the properties of ideasthesia, it was proposed[28] that synesthesia develops during childhood at the time at which children are for the first time intensively engaged with abstract concepts. This hypothesis—referred to as semantic vacuum hypothesis—explains why the most common forms of synesthesia are grapheme-color, spatial sequence and number form: These are usually the first abstract concepts that educational systems require kids to learn.


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