Marianne suffers from schizophrenia, and she engages in strange behaviours as she walks about town, including yelling at people in cars and carrying her fist in the air. These symptoms would be called

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Marianne's behaviours, such as yelling at people in cars and carrying her fist in the air, are examples of positive symptoms of schizophrenia. Positive symptoms are behaviours or experiences that are added to the person's usual experiences, such as delusions, disorganized speech or behavior, and hallucinations. Negative symptoms, on the other hand, involve a lack or absence of normal functioning, such as lack of emotion, motivation, or speech.

Marianne Suffers from Schizophrenia, and She Engages in Strange Behaviours