Heart Rate Changes after Reinforcing Brain Stimulation in Rats

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Science  14 Jun 1963:
Vol. 140, Issue 3572, pp. 1233-1235
DOI: 10.1126/science.140.3572.1233


Cardiac responses to hypothalamic and septal stimulation are polyphasic, the first component being accelerative. As interstimulus intervals are decreased, only accelerative components appear, but prestimulus heart rates ("background levels") are decreased upon septal and are either increased or unchanged upon hypothalamic stimulation. The suggestion that parasympathetic responses accompany reinforcing brain stimulation was not supported.