I came to the conclusion that I have autistic tendencies a long time ago - lack of understanding of social cues, constant pattern recognition, stuttering, habitual actions... Given the high autism rates in Silicon Valley, it seems likely to me that there is indeed a genetic component, and "high-functioning" autistics have a heterozygous genotype. (Although I don't think it's yet ruled out that it could be caused by some type of improper socialization.)

However, I seem to have an uncommon level of ability to self-modify (from my discussions with other people, including rationalists), and since discovering rationality I've been attempting to ruthlessly optimize various aspects of myself. For my most recent example, because I didn't understand social cues I took a PUA seminar and within days I could successfully approach and charm people in bars and clubs, a world that I always thought would be inaccessible to me. It turns out I was just unconsciously sending low-status signals, because I never paid any attention to what myself or others were doing.

This also helps me deal with the symptoms as well. I have habitual actions, but I don't allow myself to be disturbed if they are interrupted. (In fact, I think settling too quickly into habits means we don't explore the possibility space thoroughly enough, so I consciously try to break up my routines and find new ways of doing things.) I have narrow interests, but I rotate between different things, in a type of serial immersion. I can even use conscious control over my mouth, tongue and throat to relax my muscles and effectively stop my stuttering.

For what it's worth I scored a 22. I predict that number will be lower in the future.