The Data and Model of the Selective Adaptation of Human Saccades

Abstract

Target step-back consistently induced during subject's primary saccades evoked gradual change in gain, the ratio of saccade amplitude to target eccentricity. After three hundred trials, the subjects caught a target by a single saccade. Such adaptation occurred with memory-guided saccade, as well as the adaptation of visually guided saccades as has been reported in the literature. These saccades showed selectivity in adaptation. Adaptation took place even when the displaced target appearance was delayed by 400-600 ms from the end of a primary saccade. Based on these findings we propose a selective adaptation model of human saccades which bears important implication for motor learning systems.