Related Experiment Video
Updated: Jan 8, 2026
04:27
Using Facial Electromyography to Assess Facial Muscle Reactions to Experienced and Observed Affective Touch in Humans
Published on: March 15, 2019
11.7K
Evaluating the Physics and Repeatability of Human Brushers in Delivering Affective Touch
IEEE Transactions on Haptics
|December 22, 2025
Summary
Untrained individuals apply pleasant touch forces near 0.4 N but at higher velocities than optimal. Individual touch strategies show high repeatability, suggesting force and velocity should be considered together.
Area of Science:
- Psychology
- Neuroscience
- Human-Computer Interaction
Background:
- Affective touch research commonly uses simulated stroking at specific velocities (0.3-30 cm/s) and forces (0.4 N).
- These parameters are based on receiver perception, not natural toucher behavior.
Purpose of the Study:
- To investigate natural pleasant touch delivery by untrained individuals.
- To analyze stroke characteristics like force, velocity, duration, and length in a naturalistic setting.
Main Methods:
- Utilized an instrumented brush for high-resolution force and position measurement.
- Recorded data from 20 participants delivering gentle strokes to a forearm over multiple trials.
Main Results:
- Touch forces averaged 0.37 N ± 0.24 N, aligning with previous research.
- Stroking velocities averaged 13.7 cm/s ± 8.8 cm/s, exceeding the typical optimal range (1-10 cm/s).
- No correlation was found between individual stroke force and velocity, but individuals showed consistent personal strategies.
Conclusions:
- Natural pleasant touch involves forces similar to prior studies but higher velocities.
- Future research should explore the 10-30 cm/s velocity range for affective touch.
- Characterizing touch requires joint consideration of force, velocity, and individual consistency.
