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They are specifically listed as two separate disorders in the ICD, but what are the differences between Asperger's Syndrome and Schizoid Personality Disorder?

Since both result in a withdrawal from social situations, the two can seem quite similar to an outside observer; is there any accurate method used to distinguish between the two in a subject?

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Schizoid personality disorder is characterized by a lack of interest in social relationships. However, with asperger syndrome, it's a limited empathy and understanding of other's situations. In other words, asperger syndrome deals with the inability to empathize while schizoid personality disorder deals with apathy toward other's emotions. Additionally, people with apserger syndrome tend to be less withdrawn than people with schizoid personality disorder. People who have asperger syndrome show repetitive behavior and interests, while schizoid personality disorder does not show this fixation toward repetitive behavior. Asperger syndrome is probably genetically linked somehow and is placed on the autism spectrum. However, schizoid personality disorder is not on the autism spectrum. I hope this response helped!

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This is an extremely subtle distinction, if it is indeed a distinction at all. It implies that the schizoid can understand and internally resonate with others' emotions but simply doesn't care about or act on them. However, the definition of schizoid PD includes emotional coldness, detachment or reduced affect, a limited ability to express some emotions towards others, and a reduced or absent ability to feel pleasure. This, to me, looks remarkably like someone who almost completely lacks emotion as most of us understand it and would therefore be unable to empathize. – user10019 Dec 9 '15 at 18:47

Schizoid Personality Disorder has nothing to do with psychosis. A personality disorder is an enduring pattern of inner experience and behavior that deviates from the norm of the individual’s culture. The pattern is seen in two or more of the following areas: cognition; affect; interpersonal functioning; or impulse control. The enduring pattern is inflexible and pervasive across a broad range of personal and social situations. It typically leads to significant distress or impairment in social, work or other areas of functioning. The pattern is stable and of long duration, and its onset can be traced back to early adulthood or adolescence.

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