Popov Vladimir V, Supin Alexander Ya, Nechaev Dmitri I, Sysueva Evgenia V
Institute of Ecology and Evolution of the Russian Academy of Sciences, Moscow, 119071, Russia.
J Comp Physiol A Neuroethol Sens Neural Behav Physiol. 2019 Oct;205(5):707-715. doi: 10.1007/s00359-019-01358-w. Epub 2019 Jul 6.
The effects of adapting sounds (pip trains or pure tones) on auditory evoked potentials (the rate following response, RFR) were investigated in a beluga whale. During RFR acquisition, adapting signals lasting 128 ms each were alternated with test signals lasting 16 ms each; the test signal levels varied randomly. Adapting signals were trains of cosine-enveloped tone pips or pure tones. Pip rate varied with the envelope cosine cycle maintained at 0.125 of pip intervals and the cosine rise-fall time maintained at 0.0625 of pip intervals. Adapting signals shifted the amplitude-level function upward compared to the baseline (no adapting signal) function. The higher the adapting signal level was, the bigger the shift in the amplitude-level function was. The slower the pips were in the adapting signal, the smaller the adaptation effect was. A train of pips with a 0.0625-ms rise-fall time and 125 dB SPL shifted the function by 35-40 dB, whereas a train of pips with a 1-ms rise-fall time or a pure tone with the same SPL shifted the function by approximately 15 dB. The difference between the "fast" and "slow" adapting signals is supposed to be associated with their abilities to stimulate the auditory system in odontocetes.
在一头白鲸身上研究了适应性声音（短声序列或纯音）对听觉诱发电位（跟随反应速率，RFR）的影响。在获取RFR期间，持续128毫秒的适应性信号与持续16毫秒的测试信号交替出现；测试信号水平随机变化。适应性信号为余弦包络短声序列或纯音。短声速率随包络余弦周期保持在短声间隔的0.125以及余弦上升-下降时间保持在短声间隔的0.0625而变化。与基线（无适应性信号）函数相比，适应性信号使幅度-水平函数向上移动。适应性信号水平越高，幅度-水平函数的移动越大。适应性信号中的短声越慢，适应效果越小。上升-下降时间为0.0625毫秒且声压级为125分贝的短声序列使该函数移动35 - 40分贝，而上升-下降时间为1毫秒的短声序列或相同声压级的纯音使该函数移动约15分贝。“快速”和“慢速”适应性信号之间的差异被认为与其刺激齿鲸类动物听觉系统的能力有关。
