RESUMEN
Objective To explore the correlation between P300 and cognition, and to analyze its clinical meaning. Methods Thirty patients with traumatic brain injury diagnosed with a definite trauma history were recruited as the experimental group, and 20 normal subjects served as controls. All were examined with event-related potentials and the neurobehavioral cognitive status examination ( NCSE ). After two months of regular rehabilitation treatment, they were examined again with the same methods to observe any changes. Results N200 and P300 latencies in the experimental group were significantly longer compared with the control group, while the NCSE scores in the experimental group were significantly lower than in the control group. After two months of regular treatment, the NCSE scores rose and N200 and P300 latencies were significantly shorter than before. The P300 latencies and the NCSE scores were observed to be significantly correlated (r=-0.679,P≤0.01 ). Stepwise regression and multiva-riate analysis revealed that orientation ability and judgment were the components of the NCSE most closely correlated with the P300 latencies. Conclusion P300 latency can serve for the evaluation of cognition due to its significant correlation with orientation ability and time and space judgment.