Weisman, R G Discrimination based on differential nonshock confinement in a shuttle box. [electronic resource] - Journal of comparative and physiological psychology Feb 1967 - 34-8 p. digital Publication Type: Journal Article ISSN: 0021-9940 Standard No.: 10.1037/h0024165 doi Subjects--Topical Terms: AnimalsAvoidance LearningDiscrimination LearningFemaleRatsReinforcement, Psychology