ANOXIA AND BRAIN POTENTIALS

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Abstract
Abrupt complete anaemia of the cat''s brain was produced by reversible arterial occlusion and changes in potentials of known structures observed. The survival time (interval between occlusion and electrical inactivity) varies 4 fold for different brain regions, the "highest" and newest ones failing first. The recovery time (interval between release and return of potentials) is longer when survival time is shorter. For any structure it also increases with duration of the preceding anaemia. Anaemia acts primarily via anoxia, and the time values give relative respiration rates for brain parts, in agreement with those estimated in other ways. A phase of increased stimulation occurs early in anoxia and in recovery from it. Synapses are not especially sensitive to 0 lack.

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