Keywords: مقیاس هوش بزرگسالان وکسلر - تجدید نظر شده; BACS; Brief Assessment of Cognition in Schizophrenia; DUP; duration of untreated psychosis; FES; first episode schizophrenia; PANSS; Positive and Negative Syndrome Scale; SCID-I/P; Structured Clinical Interview for DSM-IV Axis I Disorders-Patient Edition;