IT WAS not until the latter months of 1943 and early 1944 that the Army made any extensive use of the electroencephalograph. By the middle of 1945 thirty-five brain-wave machines had been installed in different Army general hospitals throughout the United States. Six electroencephalographs were in use in overseas hospitals, and one overseas unit was completely mobile so that it could be taken to combat echelons for early study of cerebral injuries resulting from blast. The electroencephalograph adopted by the Army was the Grass machine of four or six channel type.1 Although the Army was late in developing adequate electroencephalographic . . .
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