• Lack of interest in social or personal relationships, preferring to be alone
• Limited range of emotional expression
• Inability to take pleasure in most activities
• Inability to pick up normal social cues
• Appearance of being cold or indifferent to others
• Little or no interest in having sex with another person

Criterion A. A pervasive pattern of detachment from social relationships and a restricted range of expression of emotions in interpersonal settings, beginning by early adulthood and present in a variety of contexts, as indicated by 4 or more of the following:

1. Neither desires nor enjoys close relationships, including being part of a family
2. Almost always chooses solitary activities
3. Has little, if any, interest in having sexual experiences with another person
4. Takes pleasure in few, if any, activities
5. Lacks close friends or confidants other than first-degree relatives
6. Appears indifferent to the praise or criticism of others
7. Shows emotional coldness, detachment, or flattened affectivity

Criterion B. Does not occur exclusively during the course of schizophrenia, a bipolar disorder or depressive disorder with psychotic features, another psychotic disorder, or autism spectrum disorder and is not attributable to the physiological effects of another medical condition.

Note: If criteria are met prior to the onset of schizophrenia, add “premorbid,” i.e. “schizoid personality disorder (premorbid).”