Working with genetically engineered mice — and especially their whiskers — Johns Hopkins researchers report they have identified a group of nerve cells in the skin responsible for what they call "active touch," a combination of motion and sensory feeling needed to navigate the external world. The discovery of this basic sensory mechanism, described online April 20 in the journal Neuron, advances the search for better "smart" prosthetics for people, ones that provide more natural sensory feedback to the brain during use.
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