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为了观察强噪声作用豚鼠后，在暂时性阈移（ＴＴＳ）和永久性阈移（ＰＴＳ）期间，听觉末梢和听觉各级中枢电反应的变化规律，我们进行了连续６２ｄ的测定。听神经电反应振幅减小２９％（Ｐ＜０．０５），耳蜗核电反应振幅减小２８％（Ｐ＜０．０５），上橄榄核电反应反而增加２１％（Ｐ＜０．０５），中脑下丘的电反应振幅进而增大３７％（Ｐ＜０．０５），听觉皮层电反应振幅却意外地增加１３１％（Ｐ＜０．００１）。这说明强噪声（１２５ｄＢ１５０ｍｉｎ）作用后，ＴＴＳ和ＰＴＳ期间，在听阈上升的同时，都可以发生听觉末梢电反应振幅减小，而越到高级中枢听觉电反应就越明显地加大振幅。我们称此现象为听觉电反应振幅向中性增大现象。
In order to observe the changes of central electrical responses at the auditory and auditory terminals during the transient threshold shift (TTS) and permanent threshold shift (PTS) in guinea pigs exposed to strong noise, we performed a continuous 62d assay. The amplitude of auditory electrical response decreased by 29% (P <0.05), the amplitude of cochlear nuclear reaction decreased by 28% (P <0.05) and the reaction of olives increased 21% (P <0.05) The amplitude of the electrical response in the inferior colliculus increased further by 37% (P <0.05) and the amplitude of the auditory cortex electrical response unexpectedly increased by 131% (P <0.001). This shows that after the effect of strong noise (125dB150min), during TTS and PTS, the amplitude of auditory terminal electrical response can decrease while hearing threshold rises, while the amplitude increases more obviously when the auditory superior electrical response is advanced. We call this phenomenon for the auditory electrical response amplitude to neutral increase phenomenon.