A model of the internal control system within the superior colliculus

This paper describes a mathematical model devised to help explain experimental observations involving the role of the superior colliculus in the generation of saccades. Specifically, the superior colliculus has long been known to be involved in production of the error signal that determines the location to which the eyes are moved. The superior colliculus is normally modeled only in terms of its final output, neglecting the processes that must occur within the superior colliculus in order to create that signal. This model includes treatment of the lateral inhibition system and the sequence of activity in populations of neurons in the superficial, intermediate, and deeper layers of the superior colliculus. Influence from the cerebellum and nuclei of the mesencephalon are included in the model to demonstrate the effect of external influences on the operation of the superior colliculus. The model demonstrates one possible function of the moving hill hypothesis as an intracollicular control system for the generation of saccades. The purpose of the development of this model is to stimulate discussion on the more precise performance of the superior colliculus in the saccadic eye movement system.