There have been increasing efforts to find the source of motor response error variability and to apply this information for the efficiency of human activity in real life. The purpose of this study was to examine of movement amplitude and movement time, and movement velocity on the space-timing variability. Subjects(6 male student) engaged in an angular timing task at four different movement times(150, 200, 250 and 300 msec) over four movement ranges, respectively, Movement velocity were 50, 120, 180, 240, 300, 400 deg/sec. The result indicated that first, spatial variability increased and timing variability decreased as amplitude increased in all movement times, but spatial variability decreased and timing variability increased as movement time increased in all movement amplitude. Spatial variability was changed linearly with increment of movement amplitudes and movement times, and timing variability was changed linearly with increment of movement amplitude. But timing variability was changed curvilinearly with increment of movement time. Second, spatial variability increased and timing variability decreased as movemnt velocity increased, and response variability changed curvilinearly with increment of velocity. These results suggest that movement amplitude, movement time and movement velocity are parameters of response variability.

• 정청희 | Chung Hee Chung