Abstract
According to Steinbach, pursuit eye movements during eye tracking reveal larger amplitudes when the observer himself moves a visual target than when he views a target moved independently of the observer's will. Steinbach attributed this improvement of the tracking performance to the transmittance of an efferent signal generating hand movements to the pursuit eye movement system. Meanwhile, it is known that the performance in eye tracking varies also according to the predictability of target movements. This paper presents an experiment suggesting that the mechanism of the improvement in tracking of the observer-moved target is the same as that in tracking of a predictable target.
