Schizophrenia and related psychotic disorders – brief psychotic disorder, delusional disorder, schizoaffective disorder, schizophreniform disorder, and schizotypal personality disorder – are characterised by psychotic symptoms, and often by negative symptoms and cognitive dysfunction.
- Psychotic symptoms include:
- Disorganised thinking and speech; and
- Bizarre and inappropriate motor behaviour (including catatonia).
- Negative symptoms:
- These are a decrease in or lack of normal emotions and behaviours.
- For example, individuals may lack motivation and their face may not express emotions.
- Cognitive dysfunction:
- This refers to problems with thinking (cognition), such as being able to focus one’s attention, remember things, have self-control, and think flexibly.
Diagnosis and treatment of schizophrenia and related psychotic disorders are based on symptoms and the course of the specific illness.
Types of Schizophrenia and Related Disorders