耳蜗中阶记录总和电位（SP）频率选择性的实验观察

Frequency Selectivity of Summating Potential Recorded From Scala Media of Cochlea in Guinea Pig

用不同频率的短纯音（０．５、１、２、４、８、１０ｋＨｚ）诱发，从豚鼠不同耳蜗圈的中阶记录总和电位（ＳＰ），同时记录蜗内直流电位（ＥＰ），观察其ＳＰ幅度变化，结果提示，在基底圈记录时，ＳＰ的最大幅度出现在８ｋＨｚ，在第二回、第三回记录时，ＳＰ的最大振幅分别出现在４ｋＨｚ、２ｋＨｚ，似说明ＳＰ变化在耳蜗内遵循Ｂｅｋｅｓｙ行波原理进行。

Summating potential(SP) was recorded from scala media at different turns of cochlea in guinra pigs using tone bursts 0.5,1,2,3,4,8 and 10 kHz.Endocochlear potential(EP) was recorded simultaneously to monitor the condition of the cochlea.The maximum SP amplitude change was at 8 kHz at the basal turn,4 kHz at the 2nd turn and 1 kHz in the third turn.SP thus shows its frequency selectivity,following Bekesy's traveling wave theory.