The "living computer" was grown from 25,000 neurons extracted from a rat's brain and arranged over a grid of 60 electrodes in a Petri dish.
The brain cells then started to reconnect themselves, forming microscopic interconnections, said Thomas DeMarse, professor of biomedical engineering at the University of Florida.
"It's essentially a dish with 60 electrodes arranged in a dish at the bottom," explained DeMarse, who designed the study.
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