Action current studies of the nervous system (exclusively) have employed but one circuit leading away from the responding tissue. Our work with such technic led to findings suggestive of mass responsiveness in the central nervous system and introduced the need for an apparatus that would record simultaneously from more than the one field. We found the solution of this problem in the following apparatus.
APPARATUS AND METHOD
Our recording apparatus consisted of a Westinghouse four element oscillograph, a General Radio type 377 low frequency oscillator and two resistance-coupled amplifiers.The two oscillograph elements employed with the amplifiers were adjusted to the identical sensitivity of 0.045 inch deflection per milliampere. The element employed with the oscillator gave a sensitivity of 0.01 inch deflection per milliampere. A fourth element which gave a sensitivity of 1.02 inch deflection per milliampere was employed as a check on any possible effects of extraneous influences. All
LEE EDWARD TRAVIS, JOHN M. DORSEY. ACTION CURRENT STUDIES OF SIMULTANEOUSLY ACTIVE DISPARATE FIELDS OF THE CENTRAL NERVOUS SYSTEM OF THE RAT. Arch NeurPsych. 1932;28(2):331–338. doi:10.1001/archneurpsyc.1932.02240020083005