Mechanisms of Eye-Hand Coordination
Final rept. 1 Jul 92-30 Jun 93,
MINNESOTA UNIV MINNEAPOLIS DEPT OF PHYSIOLOGY
Pagination or Media Count:
We studied the capacities of human subjects to localize tactile stimuli in 3D space. For that purpose, five subjects 3 women and 2 men were asked to make a pointing movement to a visual stimulus in otherwise complete darkness. At some random time before, during or after this initial movement, a tactile probe was presented to the tip of the subjects index finger. The probe 1-mm diameter, 0.75-mm extent, 5-ms duration was applied by a lightweight 80 g tactile stimulator worn on the subjects hand. To complete the task, the subject was required to point to the 3D spatial location at which the probe was applied. Hand position was monitored 200 Hz by a video-based motion analysis system. In each subject, probes presented just before or during the initial movement were systematically mislocalized in the direction of that movement so that subjects perceived the probe to be at the location occupied by the hand 50 to 100 ms after probe onset. This mislocalization is likely to be important in dealing with objects in the dark, especially with obstacles encountered along a movements path. Eye-hand coordination, Spatial localization, Tactile stimulation.
- Anatomy and Physiology