Neural integration by short term potentiation.
Neurophysiological studies in the oculomotor system suggest that an integrative operation is required in order to derive an eye position signal from a command signal which usually correlates with eye velocity. Several proposed models for a neural integrator are examined. All these models incorporate some form of positive feedback as a basic mechanism. Based on the performance of the models, we argue that such a scheme require extreme high precision in order to work properly. A new model based on potentiation phenomena in synaptic transmission is proposed and is shown to be free from the deficits of most previous models. The proposed model also accounts for various neural behaviors in a very natural way. A possible implementation of the model is also discussed in the context of the vestibulo-ocular reflex (VOR).
Shen
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Laboratory of Neurophysiology, University of Minnesota, Minneapolis 55455.
D000818:Animals; D005133:Eye Movements; D008959:Models, Neurological; D012027:Reflex, Vestibulo-Ocular; D009435:Synaptic Transmission