A new study has revealed that the nerves in human skin can judge the size and shape of things they touch.

Previously, it was thought that the neurons in skin only sent raw information to the brain, but research shows that they actually perform the advanced calculations themselves.

A network of neurons extends into the skin to record touch, referred to as first-order neurons in the tactile system, branching across the skin so that each neuron can signal touch from millions of highly-sensitive zones on the skin.

But, according to researchers at the Umeå University in Sweden, this network allows first-order tactile neurons not only to send signals to the brain that something has touched the skin, but also process geometric data about the object touching the skin.

“Our work has shown that two types of first-order tactile neurons that supply the sensitive skin at our fingertips not only signal information about when and how intensely an object is touched, but also information about the touched object's shape,” says Andrew Pruszynski, one of the researchers behind the study.

The study also shows that the sensitivity of individual neurons to the shape of an object depends on the layout of the neuron’s highly-sensitive zones in the skin.

“Perhaps the most surprising result of our study is that these peripheral neurons, which are engaged when a fingertip examines an object, perform the same type of calculations done by neurons in the cerebral cortex,” Pruszynski said.

“Somewhat simplified, it means that our touch experiences are already processed by neurons in the skin before they reach the brain for further processing.”