Abstract
The purpose of this paper is to clarify the relationship between the visual feedback mechanism and the task difficulty in the two-handed symmetrical motions from the structure of eye-movement time by use of eye-mark recorder.
Six right-handed male students served as the subjects. Two experiments were carried out. In Exp. I, 48 combinations of four movement distances (Md=5, 10, 20 and 40cm), three target diameters (Td=8, 16 and 32mm) and four spaces (S=5, 10, 20 and 30cm) were provided. The subject's task was to move the styluses of both hands as rapidly as possible. In Exp. II, the basic conditions (Md, Td) were the same that used in Exp. I, and the movement was carried out by one-handed motion.
From the results, it was suggested that in the high ID values the movements were carried out under visual feedback control. On the other hand, in the low ID values the movements were performed without eye-hand coordination.
