Event-related potentials and the mirror-normal differences of object rotation in first-episode schizophrenia

Abstract

Objective To explore the brain electrophysiological mechanism of object rotation in first-episode schizophrenia. Methods 30 patients with schizophrenia and 28 normal healthy people, who were from the Center for Mental Disease Control and Prevention, Third Hospital of PLA, took part in the mental rotation tasks, then the incubation period and amplitude of P500, and the wrong number and reaction time were measured. Results Compared with control group(normal: (494.16±34.68)ms, (9.56±2.54)μV; mirror: (496.51±33.10)ms, (6.38±2.41)μV), schizophrenia' incubation periods were significantly delayed (normal: (571.30±51.21)ms; mirror: (573.41±39.27)ms) and volatility were significantly lower (normal: (4.26±1.01)μV; mirror: (3.61±1.21)μV) in normal and mirror rotation (P 0.05); the mirror-normal image differences were not significant on the patient group' volatility (P>0.05); the normal volatility was significantly higher than mirror in the control group (P<0.05). Conclusion Schizophrenia' mental rotation ability is impaired, and mirror-normal differences on mental rotation are disappeared.It can be used as an early-stage clinical auxiliary diagnosis index. Key words: First-episode; Schizophrenia; Object rotation; Event-related potential; Mirror-normal differences