Naruse M, Kawasaki M
Department of Biology, University of Virginia, Charlottesville 22903, USA.
J Comp Physiol A. 1998 Nov;183(5):543-52. doi: 10.1007/s003590050280.
Behavioral and electrophysiological experiments were conducted to examine whether frequency-modulated electrocommunication signals are detected by the ampullary electroreceptor system in Eigenmannia. First, frequency-modulated electric organ discharges were found to contain a low-frequency component that could be detected by the ampullary system. Second, fish were successfully trained to distinguish a frequency-modulated signal, which contained a low-frequency component as in natural signals, from an artificial signal in which the low-frequency component was eliminated but still modulated in frequency. Subsequently, the trained fish responded without reinforcement to a low-frequency sinusoidal signal which mimicked the low-frequency component in the frequency-modulated signal, suggesting that the fish used the ampullary system to detect frequency modulation. Finally, physiological recording from ampullary afferent fibers demonstrated that they respond to frequency-modulated signals as predicted from the signal's low-frequency component. Electrophysiological study also showed that detection of frequency modulation by the ampullary system is immune to the presence of other constant electric organ discharges.
进行了行为学和电生理学实验，以研究 Eigenmannia 的壶腹电感受器系统是否能检测到调频电通讯信号。首先，发现调频电器官放电包含一个可被壶腹系统检测到的低频成分。其次，成功训练鱼类区分包含如自然信号中低频成分的调频信号和低频成分被消除但仍进行频率调制的人工信号。随后，经过训练的鱼在没有强化的情况下对模仿调频信号中低频成分的低频正弦信号做出反应，这表明鱼利用壶腹系统来检测频率调制。最后，对壶腹传入纤维的生理记录表明，它们对调频信号的反应正如根据信号低频成分所预测的那样。电生理学研究还表明，壶腹系统对频率调制的检测不受其他恒定电器官放电的影响。
