MODELING AND SIMULATION OF DIRECTION SELECTIVITY OFFREQUENCY TUNING CHARACTERISTICS OF AUDITORY NEURONSIN THE INFERIOR COLLICULUS OF FROGS
蛙下丘频率调谐特性方向选择性的建模和仿真

Based on neural electro-physiological experiments, a model of directional selectivity of frequency tuning characteristics (DSFTC) of auditory neurons in torus semicircularis (TC) in leopard frogs was studied. Coincidence between experiment and simulation results supports the model. The roles of the parameters in the model played in the DSFTC were discussed, thus the possible underlying mechanism for DSFTC was displayed. The results suggest: 1. Binaural inhibition may play a crucial role in direction dependent Q-value of frequency tuning curve (FTC) of TC neurons; 2. The direction dependent threshold of FTC may mainly determined by the direction dependent discharging rate of the neurons in the auditory pathway before TC. 3. The production of complex FTC and its direction dependence are mainly caused by both binaural inhibition and complex connections between neurons.