Resistance to extinction in planaria.
D000818:Animals; D003214:Conditioning, Classical; D004285:Dogs; D004597:Electroshock; D005108:Extinction, Psychological; D006801:Humans; D009043:Motor Activity; D010775:Photic Stimulation; D012055:Reinforcement Schedule; D013045:Species Specificity; D014419:Turbellaria / Q000502:physiology*