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Food vibrations: Asian spice sets lips trembling
Nobuhiro Hagura1, Harry Barber, Patrick Haggard
1Institute of Cognitive Neuroscience, University College London, , London WC1N 3AR, UK.
Proceedings. Biological Sciences
|September 13, 2013
Summary
Szechuan pepper
Area of Science:
- Neuroscience
- Sensory Perception
- Psychophysics
Background:
- Szechuan pepper is known for its unique tingling sensation.
- The specific nerve fibers responsible for this sensation were previously unclear.
Purpose of the Study:
- To identify the characteristic temporal frequency of Szechuan pepper-induced tingling.
- To determine which tactile afferent fibers are responsible for the sensation.
Main Methods:
- Szechuan pepper was applied to participants' lips.
- Participants compared the tingling sensation frequency to mechanical vibrations on their fingers.
Main Results:
- The perceived tingling frequency was consistently around 50 Hz.
- This frequency matches the range of rapidly adapting type 1 (RA1) afferent fibers.
- Adapting the RA1 channel reduced the perceived tingling frequency.
Conclusions:
- The study identifies RA1 afferent fibers as responsible for Szechuan pepper-induced tingling.
- This suggests a shared sensory channel between Szechuan pepper and mechanical vibration.
- Quantitative psychophysics can help characterize sensory experiences.
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