He implanted several hundred electrodes into different parts of a monkey’s brain and used these implants to apply shocks, causing different body parts to move. In 1969, professor Eberhard Fetz was able to isolate and record the firing of a single neuron onto a microelectrode he had implanted into the brain of a monkey. Fetz learned that primates could actually tune their brain activity to better interact with the implanted machine. He rewarded them with banana pellets every time they triggered the microelectrode, and the primates quickly improved in their ability to activate this specific section of their brain.
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