BME 4900 Final Report - Biomedical Engineering - University of ...

BME 4900 FINAL REPORT 7Team 8-12 VExcitatory Input100k10k 220k 5k0.1µ20k0.1µOutput9.1k 39k 43k 100kInhibitory Input+12 VFigure 3. The preliminary Harmon neuron model circuit schematic. The circuit is not limited tohaving only the specified number of inputs; more can be added as needed.This circuit, using the parameters given above, yields a signal resembling that ofthe Hodgkin-Huxley model of the action potential. The design also allows for explicitdefinition of excitatory and inhibitory inputs, making it significantly easier toaccomodate the multiple input signals of some neuron populations.Using thedocumented properties of the circuit, modifications can be made in order to develop theunique behaviors of the neuron populations being included in the neural network for thesaccade controller. Though modification of this circuit is more feasible than for the Roymodel, it still uses a more than desirable amount of circuit components, and with that, ithas a high level of complexity.Finally, the FitzHugh-Nagumo (FHN) neuron model was also considered. Thismodel is based on the work of Hodgkin and Huxley, and produces similar results with asimpler design. A circuit schematic is found in Fig. 4.