Effect of discriminative cues and time interval on tolerance of pain as a measure of fear.
D000818:Animals; D001362:Avoidance Learning; D001522:Behavior, Animal; D003118:Color Perception; D003463:Cues; D004056:Differential Threshold; D004193:Discrimination Learning; D005239:Fear; D008297:Male; D010146:Pain / Q000517:prevention & control*; D051381:Rats; D013997:Time Factors