Neural response to electrical currents isn't localized, as previously believed

For more than a century, scientists have been using electrical stimulation to explore and treat the human brain. The technique has helped identify regions responsible for specific neural functions — for instance, the motor cortex and pleasure center — and has been used to treat a variety of conditions from Parkinson's disease to depression. Yet no one has been able to see what actually happens at the cellular level when the brain is electrically prodded.

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