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Extracting Visual Evoked Potentials from EEG Data Recorded During fMRI-guided Transcranial Magnetic Stimulation

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Top-down interference and cortical responsiveness in face processing: a TMS-EEG study.

Giulia Mattavelli¹, Mario Rosanova, Adenauer G Casali

¹Department of Psychology, University of Milano-Bicocca, P.za Ateneo Nuovo 1, Milano, Italy. g.mattavelli2@campus.unimib.it

|March 26, 2013

Summary

This summary is machine-generated.

This study reveals that the prefrontal cortex influences early visual processing of faces. Specifically, stimulating the medial prefrontal cortex impacts face processing networks, especially during expression recognition.

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Combined Transcranial Magnetic Stimulation and Electroencephalography of the Dorsolateral Prefrontal Cortex

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Area of Science:

Cognitive Neuroscience
Neurophysiology

Background:

Face processing involves a distributed fronto-temporo-occipital network.
The precise functional interactions within this network remain incompletely understood.

Purpose of the Study:

To investigate the functional relationship between frontal and posterior brain regions during face processing.
To explore cortical excitability using transcranial magnetic stimulation combined with electroencephalography (TMS-EEG).

Main Methods:

TMS-EEG was employed to stimulate the right medial prefrontal cortex (mPFC) during face identity and expression tasks.
TMS-evoked potentials (TEPs) were recorded and compared across tasks and a control condition.
A control stimulation site over the right premotor cortex (PMC) was used to assess site-specificity.

Main Results:

TMS over the right mPFC reduced occipital P1-N1 components.
Face processing tasks modulated TEPs in occipital and temporal regions within 30 ms post-stimulation.
Facial expression tasks specifically increased right temporal TEPs.
Control stimulation over the right PMC showed no significant modulations.

Conclusions:

The medial prefrontal cortex exerts an early influence on occipital regions during face processing.
Cortical excitability in right fronto-temporal regions is dynamically modulated during explicit facial expression recognition.