Neuroscience 2000 Abstract
| Presentation Number: | 831.2 |
|---|---|
| Abstract Title: | Individuation of fingertip forces during an isometric whole-hand task. |
| Authors: |
Reilmann, R.*1,2
; Pisano, N.1
; Kirsten, F.1,2
; Henningsen, H.2
; Gordon, A. M.1
1Biobehavioral Sciences, TC, Columbia University, New York, NY 2Neurology, Westfaelische Wilhelms University, Muenster, Germany |
| Primary Theme and Topics |
G. Motor Systems and Sensorimotor Integration - 93. Control of posture and movement |
| Secondary Theme and Topics | G. Motor Systems and Sensorimotor Integration<br />- 96. Sensorimotor integration |
| Session: |
831. Posture and movement: gripping Poster |
| Presentation Time: | Thursday, November 9, 2000 9:00 AM-10:00 AM |
| Location: | Hall G-J |
| Keywords: | HAND, MOTOR*, MOVEMENT* [MOTION, MOTOR ACTIVITY], CONTROL* |
Previously we have shown that alteration of sensory feedback in one digit results in grip (normal) force adjustments in several digits during a whole-hand grasping and lifting task, i.e., the adjustments are not digit specific (Reilmann et al. SFN Abstr. 1999). However, this may be attributed to the biomechanical constraints of the task (i.e., preventing the object from tilting). The present study further investigates whether fingertip forces in each digit can be exerted independently. Subjects performed a task that was free of the biomechanical constraints observed during grasping. Each digit of their right dominant hand was placed on a force transducer mounted on a moveable block. Subjects were instructed to prevent the blocks from sliding, while equal tangential pulling loads were applied with 50g weights at each digit. Additional pulling loads of 50g or 100g were then applied at individual digits. The mean grip force at each digit over a period of three seconds was compared before and after the additional loads were added. As expected, there were considerable increases in grip forces at the loaded digit. During the 50g load condition, the force increase was generally confined to the loaded digit; i.e., the forces at the other digits did not increase. The individuation of fingertip forces was slightly reduced during the 100g condition, though overall, good individuation was still observed. The results suggest that fingertip forces during an isometric whole-hand task can be adjusted based on sensory information in a digit specific manner.
Supported by DFG (RE-1330/1) (RR) and NSF (IBN-9733679) (AMG)
Sample Citation:
[Authors]. [Abstract Title]. Program No. XXX.XX. 2000 Neuroscience Meeting Planner. New Orleans, LA: Society for Neuroscience, 2000. Online.
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