How to identify water from thickener aqueous solutions by touch
Yoshimune Nonomura1, Taku Miura, Takaaki Miyashita
1Department of Biochemical Engineering, Graduate School of Science and Engineering, Yamagata University, 4-3-16 Jonan, Yonezawa, Japan. nonoy@yz.yamagata-u.ac.jp
Journal of the Royal Society, Interface
|November 11, 2011
Summary
Scientists discovered that rapid frictional changes, not just wetness, signal water. This tactile cue, involving high acceleration, helps distinguish water from thickened liquids, potentially mimicking water sensations artificially.
Area of Science:
- Neuroscience
- Biophysics
- Materials Science
Background:
- Water detection is vital for animal survival, yet the tactile mechanisms remain unclear.
- Understanding how the human sense of touch perceives water is a significant knowledge gap.
Purpose of the Study:
- To investigate the tactile cues involved in water perception through the sense of touch.
- To identify the specific frictional stimuli that enable differentiation between water and thickened liquids.
Main Methods:
- Subjects applied water to a glass plate, and friction/vertical forces were measured.
- Finite-element analysis was used to model tactile receptor activation.
- Ultrasonic vibrators delivered artificial stimuli to fingertips.
Main Results:
- Water application generated stick-slip phenomena with high acceleration (7x gravity).
- These stimuli were predicted to activate Meissner's corpuscles and Pacinian corpuscles.
- Artificial high-acceleration stimuli created a water-like tactile sensation without liquid.
Conclusions:
- Rapid frictional changes and high acceleration are key tactile cues for water detection.
- These findings suggest a novel mechanism for tactile water perception.
- Potential applications exist in materials science, IT, medicine, and entertainment.
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