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Related Experiment Video

Updated: Jun 17, 2026

Using Facial Electromyography to Assess Facial Muscle Reactions to Experienced and Observed Affective Touch in Humans
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Selective increase in motor excitability with intraactive (self) versus interactive touch.

Sabah Master1, François Tremblay

  • 1School of Psychology bSchool of Rehabilitation Sciences, University of Ottawa, Ottawa, Ontario, Canada K1H 8M5.

Neuroreport
|January 1, 2010
PubMed
Summary
This summary is machine-generated.

Self-touching, or intraactive touch, enhances corticomotor facilitation more than interactive touch. This finding suggests self-touch plays a unique role in how we perceive our own bodies.

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Area of Science:

  • Neuroscience
  • Motor Control
  • Somatosensation

Background:

  • The sensory cancellation hypothesis predicts reduced sensory feedback during self-initiated movements.
  • Understanding the neural mechanisms of self-touch is crucial for body representation.
  • Previous research has not fully elucidated the corticomotor response to different modes of touch.

Purpose of the Study:

  • To investigate corticomotor facilitation during intraactive (self-touch) versus interactive (experimenter-touch) touch.
  • To test the sensory cancellation hypothesis regarding self-touch.
  • To explore the role of sex in modulating the corticomotor response to touch.

Main Methods:

  • Transcranial magnetic stimulation (TMS) was used to measure corticomotor excitability.
  • Participants actively stroked their own palm (intraactive) or the experimenter's palm (interactive) with their index finger.
  • Motor evoked potential (MEP) amplitude in the first dorsal interosseous muscle was recorded.

Main Results:

  • Corticomotor facilitation, measured by MEP amplitude, was significantly higher during intraactive touch compared to interactive touch (mean 14% increase).
  • The observed effect of touch modality on MEP amplitude was independent of sex.
  • Results contradicted the sensory cancellation hypothesis's prediction of reduced facilitation during self-touch.

Conclusions:

  • Self-touch (intraactive touch) leads to greater corticomotor facilitation than being touched by another person (interactive touch).
  • These findings support the idea that self-touch is a distinct sensorimotor experience vital for internal body schema development.
  • The study highlights unique neural processing associated with self-generated sensory input.