title: Absolute and relational responding on an intermediate size transposition task with first-grade children.
mesh_terms: D002648:Child; D003210:Concept Formation; D004193:Discrimination Learning; D006801:Humans; D011340:Problem Solving; D012054:Reinforcement, Psychology; D012858:Size Perception; D013647:Task Performance and Analysis; D014163:Transfer, Psychology; D014705:Verbal Behavior; D014796:Visual Perception