Word: plethysmograph
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...machine checks up on the behavior of blood vessels, which register emotional upsets by expanding and contracting abnormally. Tulane's Drs. George E. Burch and Clarence T. Ray, searching for a simple means of registering psychosomatic disturbances "objectively," used a "plethysmograph." The subject sticks his finger tip into a plastic cup, and the machine records the finger's alternate swelling and contraction by measuring the tiny changes in the cup's air volume...
...Burch and Ray were astonished to discover how sensitive even normal people are. Possible plethysmograph use: spotting the root of a neurotic patient's trouble...
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