Summary
Development of inhibition in the cerebral cortex was noted during the first half of both true and false pregnancies. This is explained by production of lutein by the ovaries. In true pregnancy this inhibition may be enhanced by the afferent impulses coming from the receptors of the uterus when these receptors are stimulated by the developing fetus. It was demonstrated that placental hormones may affect the condition of the higher nervous activity during the second half of pregnancy.
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Katinas, V.I. Comparative data on changes in higher nervous activity in dogs with false and true pregnancy. Bull Exp Biol Med 45, 272–275 (1958). https://doi.org/10.1007/BF00803327
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DOI: https://doi.org/10.1007/BF00803327