Abstract
Saccades are the fast movements of the eyes that are used to bring a new part of the visual field to the foveal region. It is known that saccades to single targets undershoot about 90% of the hole target distance, and require additional secondary saccades to the target, it is so-called saccadic undershoot. However, the fundamental mechanism of saccadic undershoot is not known. In recent years, Harris (1995) has suggested that saccadic undershoot occurs in order to minimize the total saccadic flight-time, based on a simple mathematical model However, his model doesn't describe the actual saccadic movement. Then, in this study, we propose a model of saccadic movement and try to explain the saccadic undershoot. It is suggested that saccadic undershoot can be explained as a trade-off between accuracy and flight-time. We also discuss one view to motor development.
