THE STUDY OF THE MOVEMENT SENSITIVITY OF LOBULA NEURONS IN TABANUS MANDARINUS SCHINER
华虻小叶神经元运动敏感性的研究

A computer controlled electrophysiological experiment system was constructed. The computer programs drive a CRT Image Synthesizer to give stimulationn images which include scintillation, moving facula and moving grating. The study of the movement sensitivity of Lobula neurons in Tabanus mandarinus Schiner gives the following results :1) There are characteristic responses of the Lobula neurons to the scintillation stimulation.The displayed ON and OFF responses contain both depolarization and hyperpolariztion. The second depolarization is dose to the first when the scintillation time is shorten; The time of intervel between two depolarizations is lineasly proportional to the scintillation duration. 2) Lobula neurons are very sensitive to the velocity of the stimulating moving facula, but they do not display the moving direction selectivity; 3) The response frequency of Lobula neurons is modulated by both grating wavelength and its moving velocity without any relationship to the moving direction.