Three bottlenose dolphins (Tursiops truncatus) participated in simulated cylinder wall thickness discrimination tasks utilizing electronic “phantom” echoes. The first experiment resulted in psychometric functions (percent correct vs wall thickness difference) similar to those produced by a dolphin performing the task with physical cylinders. In the second experiment, a wide range of cylinder echoes was simulated, with the time separation between echo highlights covering a range from <30 to >300 μs. Dolphin performance and a model of the dolphin auditory periphery suggest that the dolphins used high-frequency, spectral-profiles of the echoes for discrimination and that the utility of spectral cues degraded when the time separation between echo highlights approached and exceeded the dolphin's temporal integration time of ∼264 μs.

中文翻译：

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宽吻海豚（Tursiops truncatus）在圆柱回波识别过程中的频谱提示和时间积分。

三只宽吻海豚（Tursiops truncatus）利用电子“幻像”回波参加了模拟的缸壁厚度识别任务。第一个实验产生的心理测量功能（正确百分比与壁厚之差）类似于海豚用物理圆柱体执行任务所产生的功能。在第二个实验中，模拟了宽范围的圆柱回波，回波高光之间的时间间隔覆盖了从<30到>  300μ的范围s。海豚的表现和海豚听觉周围环境的模型表明，海豚使用回声的高频频谱特征进行区分，并且当回声高亮之间的时间间隔接近并超过海豚的时间整合时间时，频谱线索的效用会降低。的~264  μ秒。