What stimulates you?
Conversations with a couple of close friends. Observing my surroundings and other people. Music (probably above all!). The visual arts. Reflection. Ideas, though not ALL ideas, just the one's that interest me at a particular moment...not all ideas are created equal. Interesting patterns that I observe. These are probably what most frequently occupy my thoughts during the day.
How much external stimulation can you tolerate?
I like external stimulation if I have complete control over the degree of exposure. When I'm at the behest of others, or when the stimulation is forced, then I have an extremely low tolerance. For instance, when I'm in school and I don't like the class or the people in it, I will be almost dying to get home where I can finally think freely. To the point where I am literally cringing to myself in frustration that the time is passing so slowly. I also don't generally like loud environments unless its some sort of concert that I volunteered to attend.
What is your internal world like?
When completely undisturbed by external influences (even music, which I use as an external tool to stimulate or amplify my thoughts and emotions) my "inner world" is like an expanse that holds multiple pieces of information in one area at once. I then shift through each area in peaceful reflection (not analysis). If I take this type of reflection far enough, it really does start to become visual, and I begin to lose track of the external world. I need isolated environments to get that far, though.
How much alone time do you need and how often do you need it?
I really enjoy socializing if it's with the right people. Introduce anyone else, however, and it becomes far less fun or enjoyable for me. That said, even when I'm with good friends, I still need at least four or five hours of solid alone time if I want to prevent myself from getting cranky and restless.
What comes along with being an introvert that most people don't realize?
That choosing to stay in on a Friday or Saturday night is NOT a sign of alienation, low self-esteem, or even lack of friends. Oh, and that being ignored and forgotten in group settings (including in class, by your teachers) is basically the way it turns out for you most of the time.