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This is a personality disorder involving a lack of interest in social relationships.  The suffered doesn’t want to spend time with others.  It differs from Schizotypal Personality Disorder in part due to a lack of fear being the motivating factor for social isolation.

Schizoid Personality Disorder Web Sites
Wikipedia: Schizoid Personality Disorder

American Journal of Psychiatry articles on PDs other than Borderline and Antisocial