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Somatosensory Event-related Potentials from Orofacial Skin Stretch Stimulation

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Published on: December 18, 2015

Erps evoked by viewing facial movements.

A Puce, A Smith, T Allison

Cognitive Neuropsychology

|October 15, 2010

Summary

Human brain responses to facial movements, specifically eye and mouth actions, were studied using event-related potentials (ERPs). Findings suggest bilateral temporal cortex processes biological motion, crucial for social interaction.

Area of Science:

Neuroscience
Cognitive Neuroscience
Psychology

Background:

Human neuroimaging and event-related potential (ERP) studies indicate ventral and lateral temporo-occipital cortex sensitivity to static faces and face parts.
Recent fMRI data demonstrate activation by facial movements.

Purpose of the Study:

To assess event-related potentials (ERPs) evoked by viewing moving eyes and mouths within a face, and moving/static eyes with/without facial context.
To analyze N170 and P350 peak amplitude and latency data in response to facial movements.

Main Methods:

Recorded ERPs from 22 posterior scalp locations in 20 healthy males.
Presented stimuli including moving eyes and mouths in facial context, and moving/static eyes with and without facial context.
Analyzed N170 and P350 peak amplitude and latency.

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Main Results:

N170 amplitude was larger for opening mouths vs. closing mouths, and eye aversion vs. gazing.
N170 latency was shorter for mouth opening vs. closing and eye aversion vs. gazing over the right inferior temporal scalp.
These effects were independent of facial context and not due to movement alone.

Conclusions:

Bilateral temporal cortex is part of a system sensitive to biological motion, including facial movements.
A specialized system for facial gesture analysis may inform social attention and understanding of others' actions.