Antonelli A, Cazzavillan A, Gaini R, Grandori F, Oldini C, Vecchi E
Scand Audiol. 1981;10(1):13-9. doi: 10.3109/01050398109076157.
The early auditory evoked electrical activity has been recorded in man at the promontory (transtympanic approach) and on the scalp vertex-mastoid derivation), in response to clicks delivered at different rates. Latency and amplitude of the first two peaks (N1 and N2), as a function of the repetition rate, have been measured and compared. The differences between the latencies of transtympanic and surface N1 are very small, at any rate, with a maximum value of 0.08 msec. In the transtympanic recording, the latency difference between N2 and N1 is constant throughout the whole range of rate values, from 3 to 100 clicks per second. In the surface responses, on the contrary, the latency difference between N2 and N1 tends to increase as the rate is increased. The amplitude of the transtympanic N2 is consistently reduced at click rates above 20-50 per second (more markedly than the amplitude of N1), while the amplitude of the surface N2 is much more insensitive to the rate increase. Some implications of these results are discussed with respect to the origin of N2 in the two recording conditions.
人们已通过经鼓岬（经鼓膜途径）和头皮顶点 - 乳突导联记录早期听觉诱发的电活动，以响应不同速率发出的咔嗒声。已测量并比较了前两个波峰（N1和N2）的潜伏期和振幅与重复率的函数关系。无论如何，经鼓膜N1和表面N1潜伏期之间的差异非常小，最大值为0.08毫秒。在经鼓膜记录中，N2和N1之间的潜伏期差异在每秒3至100次咔嗒声的整个速率值范围内保持恒定。相反，在表面反应中，N2和N1之间的潜伏期差异倾向于随着速率增加而增大。当咔嗒声速率高于每秒20 - 50次时，经鼓膜N2的振幅持续降低（比N1的振幅更明显），而表面N2的振幅对速率增加则不那么敏感。针对这两种记录条件下N2的起源，讨论了这些结果的一些影响。
