A minimal model to simulate dynamics of initial vergence component

According to the dual-mode theory, the two different dynamic components seen in the step response of disparity vergence eye movements are under separate control mechanisms. The initial, fast rising component is controlled by an open loop, preprogrammed system while the later, slow component is feedback controlled. The ability to separate the two components, or to isolate the initial component, is critical to the study of both control systems. To approach this goal, a simple open-loop control model, containing four independently adjustable parameters, was designed to simulate the disparity vergence movement. This model provided a substantial simplification of the control system, yet demonstrated remarkable accuracy in its ability to simulate the dynamic details of the initial component vergence response.