Faulty beliefs that cannot be shaken despite evidence to the contrary

Behavioural deficits, such as flattened emotions and social withdrawal

Perceived sensations with the absence of real, external stimuli

Abnormal motor activity, ranging from rigidity to excitement

A break from the real world

Disrupted flow of thought, rapid topic changes, or speech lacking meaning

Behavioural excesses or peculiarities, such as hallucinations and delusions