Navarro, Victor M Pigeon category learning: Revisiting the Shepard, Hovland, and Jenkins (1961) tasks. [electronic resource] - Journal of experimental psychology. Animal learning and cognition Apr 2019 - 174-184 p. digital Publication Type: Journal Article ISSN: 2329-8464 Standard No.: 10.1037/xan0000198 doi Subjects--Topical Terms: AnimalsAttentionColumbidae--physiologyConcept Formation--physiologyConditioning, Operant--physiologyDiscrimination, PsychologicalHumansIndividualityLearning--physiologyModels, PsychologicalPattern Recognition, Visual--physiologyPhotic Stimulation