7 Two simple efficient procedures, automatically programmed in standard operant test chambers, are described for training rats to a high degree of response differentiation solely on the basis of the perceptual or sensory alterations caused by a drug. Rapid learning of differential approach and avoidance responses occurred with a Conflict procedure whereby hungry rats received food reward in one condition (1.2 g./kg. ethyl alcohol for seven animals, saline for seven animals) and shock in the other condition, after every fifth lever press. With a Choice procedure, a separate group of hungry rats learned to press preponderantly the food-rewarded lever during the initial, unreinforced portion of sessions in which they received food reward on an intermittent schedule for presses on one lever in the alcohol condition (left-hand lever for four animals, right-hand lever for four animals) and for presses on the other lever in the saline condition.
Keyphrases 0 Differential responses-test procedures 0 Alcohol, nondrug conditions-perceptual response differentiation 0 Choice procedure-test method 0 Conflict procedure-test method 0 Equipment-differential response testing