OBSERVATION OF CHANGES IN ACTION POTENTIAL (N_1))LATENCY AFTER INTENSIVE SOUND EXPOSURE AND ANALYSIS OF EARLY ASSESSMENT FOR PERMANENT THRESHOLD SHIFTING(PTS) IN GUINEA PIG
强声对豚鼠动作电位（N_1）潜伏期的影响及永久性阈移（PTS）早期预测指标分析

The electrode was inseted into Fallopian's canal of Guinea Pigs lasting a long time during the study. The AP(N1) latency in awake Guinea Pigs exposed to white noise or 2.83 KHz tone with various time and intensity was observed systematically. The results shoed that the statistical prolongation of AP(N1) latency in respouse to click and tone bursts after exposure could used as an ideal index of early assessment of PTS (permanent threshold shifting).