Feng A S, Shofner W P
Hear Res. 1981 Nov;5(2-3):201-16. doi: 10.1016/0378-5955(81)90046-0.
Directional responses of single auditory fibers in the eighth nerve of northern leopard frogs (Rana pipiens) were studied in order to gain some insights into the acoustical properties of the frog's ear. In addition to the actual directional response of a fiber, a theoretical directional-response curve to the intensity-rate function of the unit. The difference in the two responses provided a measure of the directional characteristics of the frog's ear at the stimulating frequency which can be plotted in a polar diagram to show the directivity pattern of the frog's acoustic receiver. Directivity patterns were obtained from three groups of experimental animals under the following conditions: (I) mouth filled with moistened cotton; (II) contralateral ear coated with silicone rubber cement; (III) open mouth. Changes in the directivity patterns were observed with experimental manipulations and these were compared to those obtained from normal animals (Feng, A.S. (1980) J. Acoust. Soc. AM. 68, 1107-1114). The results suggest that the frog's ear behaves as a combination pressure-pressure gradient receiver.
为了深入了解蛙耳的声学特性，对北美豹蛙（Rana pipiens）第八对脑神经中单个听觉纤维的定向反应进行了研究。除了纤维的实际定向反应外，还得出了该单元强度-速率函数的理论定向反应曲线。这两种反应的差异提供了一种在刺激频率下衡量蛙耳定向特性的方法，该特性可以绘制在极坐标图中，以显示蛙类听觉接收器的指向性模式。在以下条件下从三组实验动物中获得了指向性模式：（I）口中填充湿棉花；（II）对侧耳用硅橡胶水泥覆盖；（III）张开嘴。通过实验操作观察指向性模式的变化，并将其与正常动物获得的结果进行比较（Feng, A.S. (1980) J. Acoust. Soc. AM. 68, 1107 - 1114）。结果表明，蛙耳表现为压力-压力梯度组合接收器。
