Comment: Read more about electrodes implanted in the brain...

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Read more about electrodes implanted in the brain...

discussed starting at 1:31

Book: The 3-Pound Universe
http://www.amazon.com/Three-Pound-Universe-Judith-Hooper/dp/...

Patients who had suffered psychotic episodes their entire lives had tiny wires implanted in key zones of the brain which were stimulated 30 times per minute by a battery-powered device kept in the pocket. Initial failures were a result of the battery dying and the patient not having the presence of mind to call the doctor to report the problem. Regularly scheduled maintenance checks solved the battery problem.

...The technology was later abandoned in favor of pharmaceutical treatment...

It was probably the pandas.