Task complexity and transfer in the development of cognitive structures.
D000367:Age Factors; D000704:Analysis of Variance; D002675:Child, Preschool; D003071:Cognition; D003210:Concept Formation; D004193:Discrimination Learning; D005260:Female; D006801:Humans; D008297:Male; D011214:Practice, Psychological; D014163:Transfer, Psychology; D014796:Visual Perception