Effect of Wrist Extension of the Dominant and Non-Dominat Hands on Movement-Related Cortical Potentials

Abstract

[Purpose] The aim of this study was to investigate the effect of wrist extension of the dominant and non-dominant hands on movement-related cortical potentials. [Subjects] The subjects were 11 healthy persons who were right-handed according to the Edinburgh Handedness Inventory. [Method] The subjects performed volitional wrist extension of both hands, 50 times each, and the movement-related cortical potentials were recorded using Cz of the International 10-20 System. Electromyograms of the extensor carpi radialis muscle were recorded, and the rise of the waveform was used as the trigger. The items determined were the emergence time of the motor-related cortical potential and the maximum amplitude. [Results] A significant increase in the maximum amplitude of the movement-related cortical potential of the non-dominant hand was found, compared to the dominant hand. [Conclusion] The results suggest the difference in motor learning experience of the dominant and non-dominant hands influences the form of the motor-related cortical potentials.