title: Size discrimination in children facilitated by changes in task difficulty.
mesh_terms: D000367:Age Factors; D001076:Aptitude; D001244:Association; D001288:Attention; D002648:Child; D002675:Child, Preschool; D004193:Discrimination Learning; D005556:Form Perception; D006801:Humans; D011214:Practice, Psychological; D011340:Problem Solving; D012858:Size Perception