Altered somatosensory evoked potentials associated with improved reaction time in a simple sensorimotor response task following repetitive practice.

INTRODUCTION

Repetitive practice of sensorimotor tasks is widely used for neurorehabilitation; however, it is unknown how practice alters sensory processing (e.g., recognition, discrimination, and attentional allocation) and associated cognitive processing, such as decision-making. The purpose of this study was to investigate whether long-latency somatosensory evoked potentials (SEPs) reflecting sensory processing, attention, and decision-making are altered by sensorimotor learning.

METHODS

Fifteen participants performed a simple sensorimotor response task (thumb opposition in response to surface electrical stimulation), with experimental recording sessions before and after three days of practice. We then compared multiple SEP waveforms and reaction times (RTs) between pre- and postpractice trials.

RESULTS

The RT was reduced after practice of three days, and we found a significant positive correlation between ΔRT and ΔN140 at F3, Cz, and C3', ΔRT and ΔN250 at F3, and there was a significant negative correlation between ΔRT and ΔP300 at C3'.

CONCLUSION

The present study suggests that motor learning improves somatosensory processing and attentional allocation via neuroplasticity and that these alterations are reflected by specific SEP changes.