Science: Ten Billion Relays

The more neurologists learn about the human brain, the more it looks like an electrical calculating machine. And the more engineers learn about an artificial calculating device, the more it resembles the human brain. Last week, Neurophysiologist Warren McCulloch of the University of Illinois tried to describe the brain in purely electrical terms to a New York meeting of the American Institute of Electrical Engineers.

The brain, said Professor McCulloch, is made up of neurons (nerve cells) which are nothing more nor less than small electrical relays, each containing its own built-in power supply....

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