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Updated: Jul 7, 2026
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Somatosensory Event-related Potentials from Orofacial Skin Stretch Stimulation
Published on: December 18, 2015
Emotional Context Modulates the Response to Somatosensory Stimuli Within 20 milliseconds
Luis Carretié1, Vanessa E DaSilva-Lárez1, Victoria Branchadell2
1Facultad de Psicología, Universidad Autónoma de Madrid, Madrid, Spain.
Human Brain Mapping
|July 6, 2026
Summary
Emotional context rapidly influences sensory processing. Negative contexts attenuated early somatosensory evoked potentials (SEPs), suggesting the brain
Area of Science:
- Neuroscience
- Somatosensory System
- Emotion Processing
Background:
- Emotional context influences stimulus processing.
- Early sensory pathway modulation by emotion is not well understood.
- Somatosensory system offers faster processing for studying early emotional modulation.
Purpose of the Study:
- Identify the earliest neural trace of emotional context modulation in sensory processing.
- Investigate if early somatosensory evoked potentials (SEPs) are affected by affective context.
- Determine if the somatosensory pathway processes emotional information rapidly.
Main Methods:
- Recorded somatosensory evoked potentials (SEPs) in 37 participants.
- Applied electrical stimuli to the median nerve.
- Presented participants with positive, negative, or neutral 3D animal images to create emotional contexts.
- Analyzed early SEP components (P17 and N20) reflecting thalamic and primary somatosensory cortex activity.
Main Results:
- Identified P17 (thalamic) and N20 (primary somatosensory cortex) components in SEPs.
- Negative emotional contexts significantly reduced P17-N20 peak-to-peak amplitudes compared to positive and neutral contexts.
- Observed an attenuation of somatosensory perception in negative contexts.
Conclusions:
- Revealed the earliest emotion-modulated brain response in humans (17-20 ms) originating in the thalamus and primary somatosensory cortex.
- Suggests a rapid defensive mechanism is involved in processing negative emotional contexts.
- The somatosensory ascending pathway actively processes emotional information.
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