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Related Experiment Video

Updated: Jun 30, 2026

Using Facial Electromyography to Assess Facial Muscle Reactions to Experienced and Observed Affective Touch in Humans

Using Facial Electromyography to Assess Facial Muscle Reactions to Experienced and Observed Affective Touch in Humans

Published on: March 15, 2019

Tactile-emotion synesthesia.

V S Ramachandran¹, David Brang

¹Center for Brain and Cognition, University of California, San Diego, CA 92093-0109, USA. vramacha@ucsd.edu

|September 30, 2008

Summary

This summary is machine-generated.

Specific textures like silk and sandpaper can trigger distinct emotions in individuals with tactile-emotional synesthesia. This sensory-emotional link shows high consistency and may involve cross-activation in brain regions processing touch and emotion.

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Area of Science:

Neuroscience
Psychology
Sensory Science

Background:

Synesthesia is a neurological condition where stimulation of one sensory pathway leads to involuntary experiences in a second pathway.
Previous research has primarily focused on auditory-visual or grapheme-color synesthesia, with less exploration of tactile-emotional connections.

Purpose of the Study:

To investigate the phenomenon of tactile-emotional synesthesia, where specific textures evoke distinct emotional responses.
To assess the reliability and underlying neural mechanisms of this synesthetic experience.

Main Methods:

Experiments involved two individuals reporting texture-evoked emotions.
Facial expressions were recorded via video, and skin conductance responses (SCR) were monitored during tactile stimulation.
Evaluators rated synesthetes' subjective emotional reports.

Main Results:

High test/retest consistency (100%) was observed over 8 months.
Evaluators' ratings correlated significantly with synesthetes' reported emotions.
Skin conductance responses (SCR) were significantly heightened for negative synesthetic emotions.

Conclusions:

The findings suggest a robust link between tactile sensation and emotional experience in synesthesia.
Potential neural mechanisms include cross-activation between somatosensory cortex and insula, or fronto-limbic hyperactivation.
This may reflect an enhancement of evolutionarily primitive touch-emotion interactions.