- Decline in global function (drop in GAF of > 30%) plus family history of psychosis or individual has schizotypal personality disorder To operationalize PACE criteria duration and severity ratings of psychotic symptoms will be performed using the Positive and Negative Syndromes of Schizophrenia Scale (PANSS) (Kay et al., 1987) applying following cut-off scores, following Morrison et al (2002): Ad 1) Transient psychosis is defined with the presence of symptoms that score 4 or more on hallucinations, 4 or more on delusions, or 5 or more on conceptual disorganizations, last less than one week and resolve without antipsychotic medication. Ad 2) Attenuated psychotic symptoms are defined by the presence of symptoms that score 3 on delusions, 2-3 on hallucinations, 3-4 on suspiciousness or 3-4 on conceptual disorganization.