Realization of physiological eye movements by automatic selection of control laws using artificial neural network

摘要

Eye movements are realized in hardware by controlling an optic axis according to the movement types of an object and a head using an artificial neural network. Saccadic and smooth pursuit eye movements are realized as an autokinesis, and the compensatory eye movement as a reflex by a hardware mechanism. For basic optic axis movements, by which an object is caught in a central pit of the retina, an oculomotor machine is developed for independent horizontal movements of a head and an eyeball. A CCD camera is used for the function of an eyeball. The image output from a camera is fed to the control of a servomotor instead of eye muscles to realize eye movements. The mechanism of a head rotation is linked through bearings to the neck of an oculomotor machine. An accelerometer is used for the function of semicircular ducts in order to predict the possible displacement of a head rotation. The oculomotor machine is controlled for the above voluntary and reflex movements individually using neural network systems.