JEFFREY, W E Variables in early discrimination learning. III. Simultaneous vs. successive stimulus presentation. [electronic resource] - Child development Jun 1961 - 305-10 p. digital Publication Type: Journal Article ISSN: 0009-3920 Standard No.: 10.1111/j.1467-8624.1961.tb05028.x doi Subjects--Topical Terms: Discrimination LearningHumansLearning