Twitching

Just wondering if any of yall have heard about this before or know anything about it.. Here goes:

For as long as I can remember, I have had a weird little quirk.
Whenever I learn something, realize something, or come to a conclusion, I will twitch.

Not like a big grand-mal seizure twitch, but just a very small/localized twitch.
IE (This just happened as I was thinking of an example to use) I thought "Using my thumb twitching would be a good example" and my thumb twitched.

If I realize something about my feet, one foot will twitch.
Its not normally a muscle that you can easily single out by itself, its one of those "used with other muscles only" muscles. Kinda like twitching your ears, I guess.

If I learn something not related to my body, then normally my head will move a little bit to one side or the other (most people dont notice, but I do).

My mother also does this.


So..
Anyone got an ideas?
Feel free to ask questions if you need something cleared up, im just hoping yall can help me figure this out