What is "psychoticism"

Psychoticism is one of the three traits used by the psychologist Hans Eysenck in his P–E–N model (psychoticism, extraversion and neuroticism) model of personality. Psychoticism is a personality pattern typified by aggressiveness and interpersonal hostility.

High levels of this trait were believed by Eysenck to be linked to increased vulnerability to psychosis such as schizophrenia. He also believed that blood relatives of psychotics would show high levels of this trait, suggesting a genetic basis to the trait.