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Increased motor cortex excitability for concealed visual information

Hadar, A. A., Lazarovits, A. and Yarrow, K. ORCID: 0000-0003-0666-2163 (2018). Increased motor cortex excitability for concealed visual information. Journal of Psychophysiology, doi: 10.1027/0269-8803/a000230


Deceptive behaviour involves complex neural processes involving the primary motor cortex. The dynamics of this motor cortex excitability prior to lying are still not well understood. We sought to examine whether corticospinal excitability can be used to suggest the presence of deliberately concealed information in a modified version of the Guilty Knowledge Test (GKT). Participants pressed keys to either truthfully or deceitfully indicate their familiarity with a series of faces. Motor-evoked-potentials (MEPs) were recorded during response preparation to measure muscle-specific neural excitability. We hypothesised that MEPs would increase during the deceptive condition not only in the lie-telling finger but also in the suppressed truth-telling finger. We report a group-level increase in overall corticospinal excitability 300 ms following stimulus onset during the deceptive condition, without specific activation of the neural representation of the truth-telling finger. We discuss cognitive processes, particularly response conflict and/or automated responses to familiar stimuli, which may drive the observed non-specific increase of motor excitability in deception.

Publication Type: Article
Additional Information: © 2018 Hogrefe. This version of the article may not completely replicate the final version published in 'Journal of Psychophysiology.' It is not the version of record and is therefore not suitable for citation.
Publisher Keywords: Deception; Motor cortex excitability; Lie detection; Guilty knowledge test (GKT); Motor evoked potential (MEP); Transcranial magnetic stimulation (TMS)
Subjects: B Philosophy. Psychology. Religion > BF Psychology
R Medicine > RC Internal medicine > RC0321 Neuroscience. Biological psychiatry. Neuropsychiatry
Departments: School of Arts & Social Sciences > Psychology
Date available in CRO: 20 Jun 2018 14:05
Date deposited: 20 June 2018
Date of acceptance: 20 June 2018
Date of first online publication: 8 November 2018
Text - Accepted Version
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