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Gentle touch activates the anterior prefrontal cortex: an NIRS study
Tetsuo Kida1, Kazuyuki Shinohara
1Department of Neurobiology and Behavior, Graduate School of Biomedical Sciences Nagasaki University, Nagasaki, Japan.
Neuroscience Research
|March 30, 2013
Summary
Gentle touch, like stroking with velvet, activates brain regions linked to pleasant emotions. This study shows the frontal-polar cortex and orbitofrontal cortex are involved in the positive feelings from tactile sensations.
Area of Science:
- Neuroscience
- Psychology
- Human Sensory Perception
Background:
- Gentle tactile stimulation is known to engage emotion and reward centers in the brain.
- Understanding the neural basis of pleasant touch is crucial for fields like affective neuroscience and haptics.
Purpose of the Study:
- To investigate the activation of the prefrontal cortex during gentle tactile stimulation of the hand.
- To explore the role of specific brain regions, namely the frontal-polar cortex (FPC) and orbitofrontal cortex (OFC), in processing pleasant tactile sensations.
Main Methods:
- Employed near-infrared spectroscopy (NIRS) to measure brain activity.
- Applied gentle palm sweeps using three distinct materials: wood (neutral), velvet (sensuous), and paintbrush.
- Recorded changes in oxy-hemoglobin (oxy-Hb) concentration as an indicator of neural activation.
Main Results:
- Gentle sweeps with velvet fabric on the left palm significantly increased oxy-Hb levels in the FPC and OFC compared to wood.
- Participants reported higher pleasantness ratings for velvet touch than for wood touch.
- Neural activation patterns correlated with subjective pleasantness experiences.
Conclusions:
- The study demonstrates the involvement of the frontal-polar cortex (FPC) and orbitofrontal cortex (OFC) in mediating pleasant emotions evoked by gentle hand touch.
- These findings highlight the neural mechanisms underlying the affective component of tactile sensory experiences.
