The strength of the orienting response during blocking.
D000161:Acoustic Stimulation; D000818:Animals; D001245:Association Learning; D003214:Conditioning, Classical; D004193:Discrimination Learning; D005247:Feeding Behavior; D008297:Male; D009949:Orientation; D010775:Photic Stimulation; D051381:Rats; D011919:Rats, Inbred Strains; D012201:Reward