Volume 54, Issue 10 pp. 1559-1573
ORIGINAL ARTICLE

Stability and reliability of error-related electromyography over the corrugator supercilii with increasing trials

Nathaniel Elkins-Brown

Corresponding Author

Nathaniel Elkins-Brown

Department of Psychology, University of Toronto, Toronto, Ontario, Canada

Correspondence Nathaniel Elkins-Brown, Department of Psychology, University of Toronto, 1265 Military Trail, Toronto, ON M1C 1A4, Canada. Email: [email protected]Search for more papers by this author
Blair Saunders

Blair Saunders

Department of Psychology, University of Toronto, Toronto, Ontario, Canada

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Frank He

Frank He

Department of Psychology, University of Toronto, Toronto, Ontario, Canada

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Michael Inzlicht

Michael Inzlicht

Department of Psychology, University of Toronto, Toronto, Ontario, Canada

Rotman School of Management, University of Toronto, Toronto, Ontario, Canada

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First published: 16 June 2017
Citations: 10

Funding information: Canada's Natural Sciences and Engineering Research Council (NSERC) and Social Sciences and Humanities Research Council (SSHRC) grants (to M. I.)

Abstract

Electromyographic activity over the corrugator supercilii (cEMG), the primary facial muscle involved in negative emotions, is increased during the commission of errors on speeded reaction-time tasks. In the present paper, data from two previously published studies were reanalyzed to investigate the reliability and stability of error-related, correct-related, and difference cEMG across increasing numbers of trials. For a modified go/no-go and a flanker task, we found that error-related cEMG was highly stable and reliable in 14 trials, and correct-related cEMG between 56 and 82 trials, respectively. Given the typical number of trials used in studies of cognitive control, these findings suggest that many investigations of error monitoring are already sufficient to obtain acceptable error- and correct-related cEMG signals. Error-related cEMG activity is relatively easy to measure and, as such, it shows great promise for future research investigating the cognitive and affective mechanisms of error monitoring.

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