<正> The results of visual event-related potential（ERP）examinations and reactiontime（RT）tests were reported in 30 elders and compared with their performanceintellegence quotient（PIQ）scores.The subjects consisted of 18 males and 12 femalesaged 50-71（mean 61.4）years old.No history of central nervous system disease wasfound.The visual stimuli were randomly presented to the subject

including three sym-bols:E as target stimulus with 0.15 probability

and H and E as nontarget stimuliwith 0.15 and 0.70 probability respectively.The recording electrodes were placed on Fzand Pz.The duration from the subject seeing the target to touching a button immediatelywas considered as reaction time（RT）.It was shown that the P3 latency at Pz was longer than that at Fz and the P3amplitude at Pz was larger than that at Fz

and that the RT was longer than P3 latencywith obvious effect of distribution（P<0.05 at Fz and P>0.05 at Pz）as well .The higherthe PIQ scores

the longer the RT and the P3 latency.It is suggested that the ERPmight reflect the differences of PIQ scores

and the P3 is an objective index.We considerthat the research of ERP is of great interest in the neuropsychological and neurological sci-ences.