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Why Do Fingers Wrinkle When They Get Wet? July 29, 2011

Posted by viboon in : Science and engineering , add a comment

Changizi thinks that the wrinkles act like rain treads on [tires]. They create channels that allow water to drain away as we press our fingertips on to wet surfaces. This allows the fingers to make greater contact with a wet surface, giving them a better grip.

Scientists have known since the mid-1930s that water wrinkles do not form if the nerves in a finger are severed, implying that they are controlled by the nervous system.

“I stumbled upon these nearly century-old papers and they immediately suggested to me that pruney fingers are functional,” says Changizi. “I discussed the mystery with my student Romann Weber, who said, ‘Could they be rain treads?’ ‘Brilliant!’ was my reply.”

จากงานวิจัยของ Changizi (2011) พบว่า สาเหตุที่ทำให้นิ้วมือมีลักษณะผิวเป็นคลื่นๆ เมื่อถูกน้ำนานระยะเวลาหนึ่ง คือระบบประสาทควบคุมให้นิ้วมีพื้นผิวเป็นร่องๆ เพื่อช่วยในการรีดน้ำออกเ​หมือนยางรถยนต์ ทำให้หยิบจับอะไรได้ไม่ลื่น

Changizi, M., Weber, R., Kotecha, R. & Palazzo, J. Brain Behav. Evol. advance online publication doi:10.1159/000328223 (2011).

Ref: http://www.nature.com/news/2011/110628/full/news.2011.388.html

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