Figure 6. Task Schedule.

Each trial started with a beep sound and the appearance of a target line. After a 2500-ms pause, three intermediate-tone beeps were given at 400-ms intervals, followed by a high-tone beep, and the appearance of a target at a random position on the target line. The subject began wrist movement immediately after target presentation so as to hit the target with a cursor. The computer program monitored wrist movements, detected their peak angular velocity and initiated the cursor movement. Timing of visual feedback differed among the delay conditions. Under some conditions, visual information was given later than task-end, while under the other conditions, it was given in advance of task-end.