Dolphins emit a probing pulse and receive an echo pulse for echolocation during hunting, on the basis of which they detect and identify their prey in the search phase. In the capture phase, dolphins require a stable auditory response to the echo pulse. To explain the features of the perception of echo pulses in the search and capture phases, the pulse-induced response of an ensemble of high-frequency peripheral fibers was modeled. A pair of pulses with center frequencies of 70 kHz, different inter-pulse intervals and peak amplitudes was a model of a probing pulse and an echo pulse. The pulses entered the model at different processing steps, including the transformation of the receptor potential of inner hair cells into a sequence of action potentials of an ensemble of auditory nerve fibers. It was shown that in order to reproduce the temporal structure of the pulses in the ensemble response, the resulting receptor potential must correspond to the response thresholds of most of the ensemble fibers. At short intervals between pulses in a pair, the reproduction of the temporal structure of the second pulse (echo pulse) was facilitated by an increase in the response thresholds of the fibers of the ensemble due to the refractory properties caused by the action of the first pulse (probe pulse model). At large intervals between pulses in a pair, variations in the peak amplitudes of the first pulse (probing pulse models) could be responsible for the reproduction of the structure of the second pulse (echo pulse). It was shown that the modeling is a convenient means to identify different ways of the adjustment of echo pulses to the auditory sensitivity of dolphins in the phases of searching for and capturing prey.

海豚在狩猎过程中发出探测脉冲并接收回波脉冲以进行回声定位，在此基础上，它们在搜索阶段检测和识别猎物。在捕获阶段，海豚需要对回波脉冲有稳定的听觉反应。为了解释在搜索和捕获阶段感知回波脉冲的特征，对一组高频外围纤维的脉冲诱发响应进行了建模。一对具有 70 kHz 中心频率、不同脉冲间间隔和峰值幅度的脉冲是探测脉冲和回波脉冲的模型。脉冲在不同的处理步骤进入模型，包括将内毛细胞的受体电位转化为听觉神经纤维集合的一系列动作电位。结果表明，为了在集合响应中重现脉冲的时间结构，产生的受体电位必须对应于大多数集合纤维的响应阈值。在一对脉冲之间的短间隔内，由于第一个脉冲的作用引起的耐火特性，通过增加整体纤维的响应阈值来促进第二个脉冲（回波脉冲）的时间结构的再现。脉冲（探针脉冲模型）。在一对脉冲之间的较大间隔处，第一个脉冲（探测脉冲模型）的峰值幅度的变化可能是造成第二个脉冲（回波脉冲）结构再现的原因。