New Direct Evidence against Intermittency or Sampling in Human Smooth Pursuit Eye Movements

IN 1962 and 1963 a sampled data model for eye movements following unpredictable targets was proposed by Young and Stark1,2. Five important experimental results were given as evidence leading to a dual sampled data control system with position (saccadic) and velocity (pursuit) paths, both with sampling periods lasting approximately 0.2 s (ref. 3). The model thus proposed was quite successful in organizing these facts, as well as predicting others relating to those newly suggested experiments in which the feedback of the control system was varied.