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Updated: Aug 9, 2025

Stimulating the Lip Motor Cortex with Transcranial Magnetic Stimulation

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Published on: June 14, 2014

Apparent increase in lip size influences two-point discrimination.

Elisabetta Ambron¹, H Branch Coslett^2,3

¹Laboratory for Cognition and Neural Stimulation, Perelman School of Medicine at the University of Pennsylvania, 3710 Hamilton Walk, Philadelphia, PA, 19104, USA. eli.ambron@gmail.com.

Scientific Reports

|February 22, 2023

Summary

Altering body perception with anesthetic cream (AC) improved tactile discrimination, specifically two-point discrimination (2PD). Increased perceived lip size correlated with enhanced accuracy in detecting touch, suggesting body representation influences sensory perception.

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Area of Science:

Neuroscience
Somatosensory Perception
Body Representation

Background:

Magnified visual feedback of body parts enhances tactile discrimination.
The influence of altered somatosensory perception on tactile acuity is not fully understood.

Purpose of the Study:

To investigate if somesthetic stimulation, altering body size perception, can improve two-point discrimination (2PD).
To determine the role of perceived body size in modulating tactile performance.

Main Methods:

Anesthetic cream (AC) applied to lips to alter perceived size and somatosensation.
Two-point discrimination (2PD) task to measure tactile acuity.
Control conditions included no cream and moisturizing cream application.

Main Results:

AC application increased perceived lip size and improved 2PD performance.
Improved 2PD accuracy was associated with increased perceived lip size.
Both AC and moisturizing cream improved touch detection, but only AC's effect was modulated by perceived lip size.

Conclusions:

Changes in body representation, induced by somesthetic stimulation, significantly influence two-point discrimination.
Perceived body size is a key factor in modulating tactile acuity.
This study provides evidence for the dynamic interplay between visual, somatosensory, and proprioceptive systems in shaping body perception and tactile performance.