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Assessing Primary Motor Cortex Excitability and Excitability Modulation by Pairing Transcranial Magnetic Stimulation with Electromyography

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Is motor cortex excitability associated with personality factors? A replication study.

Martin Schecklmann¹, Michael Landgrebe, Elmar Frank

¹Department of Psychiatry and Psychotherapy, University Regensburg, Universitätsstraße 84, Regensburg, Germany. martin.schecklmann@medbo.de

International Journal of Psychophysiology : Official Journal of the International Organization of Psychophysiology

|December 14, 2011

Summary

This study failed to replicate a previous finding linking neuroticism and motor cortex excitability. Further research suggests state factors, not personality traits, may mediate this association.

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Area of Science:

Neuroscience
Psychology
Motor Control

Background:

Previous research suggested a link between neuroticism and motor cortex excitability in men.
This association was measured using paired-pulse transcranial magnetic stimulation (TMS).

Purpose of the Study:

To replicate the association between personality traits and motor cortex excitability in a larger sample.
To investigate this relationship using multiple measures of motor cortex excitability.

Main Methods:

Eighty-nine healthy volunteers completed the NEO-FFI personality inventory.
Participants underwent various motor cortex excitability assessments, including resting/active motor thresholds and double-pulse TMS.
Cortical silent period was also measured.

Main Results:

No significant correlations were found between personality factors and motor cortex excitability.
Controlling for age, sex, and education did not reveal significant associations.
Replication of the previous finding was unsuccessful.

Conclusions:

The previously reported association between neuroticism and motor cortex excitability could not be replicated.
Differences in sample, personality measures, or TMS methodology may explain the failure to replicate.
Literature suggests state factors, rather than trait factors, might mediate personality-motor cortex excitability links.