Two mechanisms of comparing images.
D000367:Age Factors; D002648:Child; D002675:Child, Preschool; D003657:Decision Making / Q000502:physiology; D005260:Female; D005556:Form Perception / Q000502:physiology*; D006801:Humans; D009949:Orientation / Q000502:physiology; D011930:Reaction Time / Q000502:physiology