If doctors knew more about what goes on inside a man's head, they might be able to do more about diseases. But they have never had a window-in-the-head to match the window-in-the-stomach that one Alexis St. Martin once gave them.* Last week, after four years' experimenting, University of Pennsylvania Physiologist Seymour S. Kety, 32, thought he had the next best thing: a way of testing the brain's blood as it comes & goes.
Dr. Kety experimented on 400 patients in three different hospitals. First he inserted a needle in the internal jugular vein (which drains the brain), another in an artery, usually...
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