A SIMULATION STUDY OF THE STIMULATION OF A NERVE FIBER BY TIME-VARYING ELECTROMAGNETIC INDUCTION
不同时变磁场对神经纤维的诱导刺激作用的仿真研究

A pa ssive cable model for electromagnetic induction is employed to describe subthreshold behavior of a nerve fiber. By numeric simulation, subthr eshold membrane potential parameters including waveform and amplitude in a nerve fiber induced by electromagnetic field with different frequen cy are acquired. It is found that the membrane potential induced by high frequency electromagnetic field is less than that induced by low frequency. Integral transform is employed to acquire response character istic of nerve fiber induced by electromagnetic field with different s patial distribution. It is found that membrane potential induced by hi gh frequency components of the spatial distribution function is less t han that in-duced by low frequency components. Membrane potential induc ed by several typical current waveform in the stimulating coil are ca lculated. Subthreshold behaviors of nerve fiber induced by electromagnet ic field with different parameters are explained by time and space an alysis which provides theoretical foundation for the device of the coi l current and size of the coil for a magnetic stimulator.