Funasaka S, Honda K
Audiology. 1979 Nov-Dec;18(6):485-93. doi: 10.3109/00206097909072639.
The averaged whole-nerve response to frequency modulation combined with amplitude change was recorded from the round window of the guinea pig. A downward shift of 20% in the frequency of a 500-Hz, 1-kHz or 2-kHz pure tone with an amplitude increase elicited the responses. The latency for each frequency was investigated at different intensities. The latency is greater for lower-frequency tones and this latency increase agrees well with the traveling wave delay for the intensity range used in this study. A downward shift with an amplitude decrease failed to yield the response. These findings suggest that the response to a downward shift of frequency with an amplitude increase results from new activation due to an apical extension of the envelope of the traveling wave and thus represents the activity in a restricted area of the basilar membrane. Thus, the frequency-modulated tone in downward direction with increased amplitude can be a frequency-specific stimulus.
从豚鼠圆窗记录了对频率调制结合幅度变化的平均全神经反应。500赫兹、1千赫兹或2千赫兹纯音频率向下偏移20%并伴有幅度增加时引发了反应。在不同强度下研究了每个频率的潜伏期。低频音调的潜伏期更长，并且这种潜伏期增加与本研究中使用的强度范围内的行波延迟非常吻合。幅度减小的向下偏移未能产生反应。这些发现表明，频率向下偏移且幅度增加时的反应是由于行波包络顶端延伸导致的新激活产生的，因此代表了基底膜受限区域的活动。因此，幅度增加的向下方向的调频音可以是一种频率特异性刺激。
