刺激余弦开始特性对宽吻海豚（Tursiops truncatus）听觉脑干反应的影响。,The Journal of the Acoustical Society of America

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刺激余弦开始特性对宽吻海豚（Tursiops truncatus）听觉脑干反应的影响。
The Journal of the Acoustical Society of America ( IF 2.1 ) Pub Date : 2019-05-01 , DOI: 10.1121/1.5108613
Ryan Jones ₁ , James J Finneran ₂ , Jason Mulsow ₁ , Robert F Burkard ₃

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尽管听觉脑干反应（ABR）被认为是一种发作反应，但人们对刺激发作特性和所产生的ABR之间的具体关系还知之甚少。在这项研究中，通过测量六只宽吻海豚的ABR来检查刺激发作对海豚ABR的影响，同时系统地控制余弦波包围的噪声爆发的上升时间和平稳声压。噪声突发在频谱上呈“粉红色”，频率含量从10到160 kHz，上升时间从32μs到4 ms，平稳的声压级从102到138 dB重新达到1μPa。仅发现包络上升时间和平稳的声压不能很好地预测ABR峰幅度和延迟。峰振幅由260μs窗口结束时的包络声压很好地描述。然而，当允许窗口开始时间变化时，将获得与ABR峰数据最佳匹配的结果。峰值延迟最好用压力包络线的二阶导数的最大值来描述。这些结果与陆生哺乳动物的单单位和近场响应数据一致，表明上升时间大于260μs的刺激对于最大化ABR振幅而言不是最佳的。

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Effects of stimulus cosine onset properties on bottlenose dolphin (Tursiops truncatus) auditory brainstem responses.

Although the auditory brainstem response (ABR) is known to be an onset response, the specific relationship between stimulus onset properties and the resulting ABR is not well understood. In this study, the effects of stimulus onset on dolphin ABR were examined by measuring ABRs in six bottlenose dolphins while systematically manipulating rise time and plateau sound pressure of cosine-enveloped noise bursts. Noise bursts were spectrally "pink" with frequency content from 10 to 160 kHz, rise times from 32 μs to 4 ms, and plateau sound pressure levels from 102 to 138 dB re 1 μPa. Envelope rise time and plateau sound pressure alone were found to be poor predictors for ABR peak amplitudes and latencies. Peak amplitudes were well described by the envelope sound pressure at the end of a 260-μs window; however, best-fits to the data across ABR peaks were obtained when the window start time was allowed to vary. Peak latencies were best described by the maximum value of the second derivative of the pressure envelope. These results are consistent with single-unit and nearfield response data for terrestrial mammals and indicate that stimuli with rise times greater than 260 μs are non-optimal with respect to maximizing ABR amplitudes.

更新日期：2019-11-01

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