Firstly, auditory-related brain potential was a large negative wave form, which could include four waves, respectively as P60, N160, P200, and N240.Secondly, there is a significantly left-right hemispheric difference in processing pure tone.

• 1.；听觉ERP波形为头皮前部一个大的负波；又可表述为四个相对独立的成分P60；N160；P200和N240; 2