title: The reinforcing effects of vagal stimulation on classically conditioned heart rate in rats.
mesh_terms: D000818:Animals; D003214:Conditioning, Classical / Q000502:physiology*; D005071:Evoked Potentials; D005260:Female; D006339:Heart Rate; D051381:Rats; D012054:Reinforcement, Psychology; D013997:Time Factors; D014630:Vagus Nerve / Q000502:physiology*