Not trying to hijack the thread here, but maybe I wasn't so clear in what I wrote, Sunsetsunrise. Before DSMIII, there was only a diagnosis of Schizoid in the DSM. Afterwords, it had been split into Schizoid, Avoidant, and Scizotypal disorders. Check out Masterson and Klein for a different take on Schizoids. They go beyond the outward appearance of flattened affect and simply not caring for much of anything. Their view suggests a bit of overlap. My interest in the subject is my personal difficulty with social interaction. I can go out, but, depending on how well I'm feeling on that day, I usually begin to feel that my space is becoming too crowded and have to leave the room. Lately, it happens more often than not.