Tiny chips transmit data about the electrical activity of the brain wirelessly

In many existing brain-computer interface systems , electrodes (usually one or two) are implanted

Each of them stimulates and/or tracksAt the same time, there are about 86 billion neurons in the brain, and scientists are looking forways to cover as many of them as possible at the same time, without filling the patient's brain with normal-sized electrodes.

Four years ago, scientists at Brown University inRhode Island, University of Texas Baylor, UC San Diego and Qualcomm have begun developing a higher resolution alternative. The result is sensors known as neurobeads. They are much smaller than traditional implanted electrodes - each about the size of a grain of salt. They have recently been tested in rats and the results have been promising.

After implantation, a network of many neurobeads is wirelessly powered bya thin electronic patch about the size of a thumbprint that is glued to the patient's scalp.This patch also receives electrical signals fromsensors, and it also sends signalsonto stimulate neighboring neurons.

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