Behavioural excesses or peculiarities, such as hallucinations and delusions

Faulty beliefs that cannot be shaken despite evidence to the contrary

Perceived sensations with the absence of real, external stimuli

Abnormal motor activity, ranging from rigidity to excitement

A break from the real world

Behavioural deficits, such as flattened emotions and social withdrawal

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