title: Food and light as entrainers of circadian running activity in the rat.
mesh_terms: D000818:Animals; D002940:Circadian Rhythm; D003216:Conditioning, Operant; D003463:Cues; D005247:Feeding Behavior; D008027:Light; D008297:Male; D009043:Motor Activity; D010775:Photic Stimulation; D051381:Rats