We thank alan Osman, Fren Smulders, and two anonymous referces for comments on a draft of this paper, Ursula Lommen for help in data collection, and Stefan schweinberger for assisting with the Amiga display.
The lateralized readiness potential preceding brief isometric force pulses of different peak force and rate of force production
Article first published online: 30 JAN 2007
Volume 31, Issue 5, pages 503–512, September 1994
How to Cite
SOMMER, W., LEUTHOLD, H. and ULRICH, R. (1994), The lateralized readiness potential preceding brief isometric force pulses of different peak force and rate of force production. Psychophysiology, 31: 503–512. doi: 10.1111/j.1469-8986.1994.tb01054.x
- Issue published online: 30 JAN 2007
- Article first published online: 30 JAN 2007
- (Received April 19, 1993; Accepted January 10, 1994)
- Isometric force;
- Lateralized readiness potential;
- Rate of force production;
- Readiness potential
Previous studies have reported that the lateralization of the readiness potential is unaffected by force amplitude of brief unimanual responses. However, Because those studies did not spectify rate of force production, response force probably was mainly controlled by force unit duration rather than by recruitment of force units, which may explain this negative finding. To enforce recruitment control, we factorially combined peak force (10% or 50% of maximal voluntary finger force) and time to peak force (100 or 200 ms). A precue provided advance information about the responding index finger (left vs. right). After 1 s, the imperative stimulus followed, requiring a brisk isometric flexion of the specified index finger. Symmetric effects, maximal at the vertex, of both force and rate of force production were observed 200–100 ms before the imperative stimulus in stimulus-synchronized averages and 200–100 ms before response onset in response-synchronized averages. However, neither force nor rate to force production affected the lateralized readiness potential. We conclude that this measure does not reflect movement parameters but appears to indicate an abstract preparation of lateralized response channels.