There was a recent sub-discussion on a rec.arts.sf.composition thread about thinking in words versus thinking in images vs. thinking in textures etc.
It’s damn hard to observe how I think — once I start, er, thinking about it, the thought process morphs. The best I can describe it seems to be that I think in a combination of sounds and borders.
Borders — when I’m thinking about a physical object, unless I really concentrate, I don’t “see” an image of the whole thing; I see an outline of it, its borders with its surroundings. Or else I see a small snippet of it; right now I’m thinking about my officemate, and I “see” her eyes and freckles (does she really have freckles? must actually look next time I see her) but not her whole face.
(One of the interesting side-effects of giving birth — for the first couple days after my son was born, when he wasn’t with me I could see his whole face in memory, as if he was right in front of me. It must have been a hormone thing. I can’t do it now, and I can’t generally do that with faces; I recognize people fine, but I can’t usually visualize them.)
I sometimes think in words, but they’re not pure sound; I see the outline of their printed shape as well. (When I’m reading and not thinking about reading, I barely hear the words in my head at all. As I write this, I’m hearing the words as I write, but I’m sort of seeing them too.)
I definitely hear music in my head (just about all the time; right now, it’s jumping between Holsinger’s “Liturgical Dances”; old rock song whose title, performer or composer I don’t know; and occasional bouts into the end of the first half of Stravinsky’s “Rites of Spring”) but unless I’m focusing on it I hear only one line with maybe some chords. My brain doesn’t seem to do polyphony.
Other senses don’t seem to come into play much. Textures — I can think them, but I have to work at it. (Even when I’m thinking about, er, particular touch-based activities, the thoughts aren’t particularly tactile; at most, the touch pressure is there, but the texture isn’t.) I can’t imagine smells very well, or tastes. Kinesthesia I can imagine fairly well, rather to my surprise — I don’t think of myself as that movement-oriented.
Someday I’d love to get into some experiment where I get to run around with detectors on my scalp while the researchers get images of what parts of my brain fire off when. It’d be really nifty to see what areas actually kick in when I’m thinking about music or writing or the Special Secret Edition of LOTR….