Kawasaki Masashi, Guo Yuan-Xing
Department of Biology, Gilmer Hall, University of Virginia, Charlottesville, VA 22903, USA.
J Physiol Paris. 2002 Sep-Dec;96(5-6):531-7. doi: 10.1016/S0928-4257(03)00008-1.
Sensitivity of neurons in the torus semicircularis of a weakly electric fish, Gymnarchus niloticus, to two stimulus parameters that are critical for its behavior the jamming avoidance response was examined. The first parameter is the sign of frequency difference between discharge frequencies of fish's own electric organ and that of a neighbor's. The second parameter is the spatial orientation of neighbor's electric field. Whereas neuronal ambiguity of frequency coding for different orientations of neighbor's electric field is predicted, unambiguous JAR occurs at the behavioral level. Most neurons in the torus semicircularis showed sensitivity to the sign of frequency difference. Although a small number of neurons showed preference to a consistent sign of the frequency difference, the coding of the sign of frequency differences was found to be ambiguous with a highly variable pattern of responses for different orientations in most of neurons.
研究了弱电鱼裸臀鱼半规管中的神经元对其行为——避干扰反应至关重要的两个刺激参数的敏感性。第一个参数是鱼自身电器官放电频率与邻居电器官放电频率之间频率差的符号。第二个参数是邻居电场的空间方向。虽然预测了不同邻居电场方向的频率编码存在神经元模糊性，但在行为层面上会出现明确的避干扰反应。半规管中的大多数神经元对频率差的符号表现出敏感性。尽管少数神经元对频率差的一致符号表现出偏好，但在大多数神经元中，发现频率差符号的编码具有模糊性，对不同方向的反应模式高度可变。
