Between the two groups there were no differences in the P 1 latencise, but the P 1 amplitude of abnormal group elicited with the chromatic stimuli were obviously lower.

• ( 4)正常组与色觉异常组P1波的比较 ,潜伏期无差异 ,振幅在黑 白刺激下无差异 ,在颜色刺激下 ,差异有显著性。