Abstract
Smooth pursuit eye movements (SP) are involuntary in the sense that SP can not be elicited volitionally if there is no moving visual stimulus. Meanwhile, if there is an object changing position, eyes can track at any speed below that of the object. When several moving objects are given with different speeds and directions, eyes can choose and track one of the objects, showing that SP are voluntarily controlled.
This paper describes a model which provides the above inconsistent characteristics of SP. The main assumption of the model is that gains of two neural units in the SP system are controlled voluntarily. This model shows good agreement with the results reported in several papers associated with voluntariness and involuntariness of SP.
