Behavioral changes related to schizophrenia include:
- Unblinking, vacant expression
- Awkward or unusual movements of the face or body
- Talking to himself, using odd speech that you can't understand, or making rapid shifts in topics
- Inappropriate responses, such as laughing during a sad movie
- Trouble "reading" social cues in others
- Problems making and keeping friends
- Becoming more and more isolated
- Poor personal grooming and self-care
- Substance abuse
- Threatening behaviors