Segura, E T Proceedings: Humoral control of periodical changes of nervous excitability. [electronic resource] - Acta physiologica latino americana 1973 - 448-50 p. digital Publication Type: Journal Article ISSN: 0001-6764 Subjects--Topical Terms: Acoustic StimulationAnimalsBrain--drug effectsBufo arenarum--physiologyBufonidae--physiologyCastrationElectroencephalographyEstradiol--pharmacologyEstrogens--physiologyHibernationLightNeural ConductionOdorantsPhysical StimulationSeasonsSexual Behavior, AnimalSynaptic Transmission