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The lateralized readiness potential and response kinetics in response-time tasks.

J T Mordkoff¹, M Grosjean

¹Department of Psychology, The Pennsylvania State University, University Park 16823, USA. jtm12@psu.edu

Psychophysiology

|October 2, 2001

Summary

The lateralized readiness potential (LRP) in speeded tasks remains constant despite response time variations. This indicates LRP reflects hand-specific preparation, not motor programming details.

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Area of Science:

Neuroscience
Cognitive Psychology
Motor Control

Background:

Previous research indicates the lateralized readiness potential (LRP) magnitude is constant across response time variations in cued and uncued, speeded tasks.
Studies show LRP is unaffected by instructed changes in peak response force and time to peak force in cued, self-paced tasks.
However, LRP is sensitive to instructed changes in force gain rate in uncued, self-paced tasks.

Purpose of the Study:

To investigate the relationship between the LRP and response kinetics in an uncued, speeded task.
To determine if LRP magnitude at electromyographic onset varies with spontaneous changes in response time and kinetics.
To differentiate LRP's role in motor preparation versus motor programming.

Main Methods:

Examined the LRP in an uncued, speeded task.
Analyzed LRP magnitude at electromyographic onset.
Assessed variations in response time, peak response force, time to peak force, and integrated force to peak.

Main Results:

The magnitude of the LRP at electromyographic onset was constant across spontaneous variations in all measured response kinetics.
The peak of the contingent negative variation varied with peak response force and integrated force to peak, but not response time.

Conclusions:

The LRP in speeded tasks serves as a selective, on-line index of hand-specific preparation.
LRP does not appear to index motor programming elements that dictate response kinetics.
Findings support a distinct role for LRP in representing motor preparation processes.