Anodal tDCS over primary motor cortex provides no advantage to learning motor sequences via observation

Apšvalka, D., Ramsey, R. and Cross, E. S. (2018) Anodal tDCS over primary motor cortex provides no advantage to learning motor sequences via observation. Neural Plasticity, 2018, 1237962. (doi:10.1155/2018/1237962)

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Abstract

When learning a new motor skill, we benefit from watching others. It has been suggested that observation of others’ actions can build a motor representation in the observer, and as such, physical and observational learning might share a similar neural basis. If physical and observational learning share a similar neural basis, then motor cortex stimulation during observational practice should similarly enhance learning by observation as it does through physical practice. Here, we used transcranial direct-current stimulation (tDCS) to address whether anodal stimulation to M1 during observational training facilitates skill acquisition. Participants learned keypress sequences across four consecutive days of observational practice while receiving active or sham stimulation over M1. The results demonstrated that active stimulation provided no advantage to skill learning over sham stimulation. Further, Bayesian analyses revealed evidence in favour of the null hypothesis across our dependent measures. Our findings therefore provide no support for the hypothesis that excitatory M1 stimulation can enhance observational learning in a similar manner to physical learning. More generally, the results add to a growing literature that suggests that the effects of tDCS tend to be small, inconsistent, and hard to replicate. Future tDCS research should consider these factors when designing experimental procedures.

Item Type:Articles
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Cross, Professor Emily
Authors: Apšvalka, D., Ramsey, R., and Cross, E. S.
College/School:College of Medical Veterinary and Life Sciences > Institute of Neuroscience and Psychology
Journal Name:Neural Plasticity
Publisher:Hindawi Publishing Corporation
ISSN:2090-5904
ISSN (Online):1687-5443
Copyright Holders:Copyright © 2018 Dace Apšvalka et al.
First Published:First published in Neural Plasticity 2018:1237962
Publisher Policy:Reproduced under a Creative Commons License

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