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Transcranial Direct Current Stimulation and Simultaneous Functional Magnetic Resonance Imaging

Transcranial Direct Current Stimulation and Simultaneous Functional Magnetic Resonance Imaging

Published on: April 27, 2014

Improving Cross-cultural "Mind-reading" with Electrical Brain Stimulation.

A K Martin¹, P Su², M Meinzer³

¹The University of Queensland, Centre for Clinical Research (UQCCR), Brisbane, Australia; The University of Kent, Department of Psychology, Canterbury, UK.

|December 21, 2020

Summary

Facial cue interpretation across cultures is challenging. High-definition transcranial direct current stimulation (HD-tDCS) targeting the dorsomedial prefrontal cortex (dmPFC) can improve cross-cultural mind-reading abilities, especially for those with less intergroup contact.

Keywords:

Theory of Mind cross-cultural mPFC rTPJ social cognition tDCS

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Area of Science:

Neuroscience
Social Psychology
Cognitive Science

Background:

Cross-cultural differences in inferring mental states pose challenges in a globalized world.
The dorsomedial prefrontal cortex (dmPFC) is crucial for Theory of Mind (ToM).
Previous research indicates a cross-cultural disadvantage in mind-reading tasks.

Purpose of the Study:

To investigate if stimulating the dmPFC using high-definition transcranial direct current stimulation (HD-tDCS) can enhance cross-cultural mind-reading.
To determine the specificity of HD-tDCS effects on the dmPFC for this cognitive function.

Main Methods:

52 Singaporeans performed the Reading the Mind in the Eyes Test (RMET) and received HD-tDCS targeting either the dmPFC or a control site (rTPJ) in a double-blinded, crossover design.
Participant's contact with Caucasians was assessed as a potential moderator.
A comparison group of 52 Caucasians completed the RMET under sham-tDCS.

Main Results:

A cross-cultural disadvantage in RMET performance was observed in Singaporeans, particularly those with less contact with Caucasians.
HD-tDCS applied to the dmPFC significantly improved RMET performance in participants with lower intergroup contact.
No significant effects were found for rTPJ stimulation or a control task, indicating task and site specificity.

Conclusions:

Focal electrical stimulation of the dmPFC selectively enhances cross-cultural Theory of Mind (ToM) inference from facial cues.
HD-tDCS to the dmPFC can mitigate the cross-cultural disadvantage in mind-reading, particularly for individuals with limited cross-cultural exposure.
This finding has implications for improving social cognition in diverse global interactions.