Shaffer, J P Stimulus similarity and the effect of reinforcement in a pseudo-concept identification task. [electronic resource] - Journal of experimental psychology Apr 1966 - 593-9 p. digital Publication Type: Journal Article ISSN: 0022-1015 Standard No.: 10.1037/h0022996 doi Subjects--Topical Terms: AdolescentAdultConcept FormationHumansLearningModels, TheoreticalProbabilityReinforcement, Psychology