title: Perception and conservation of length: comparative study of Rwandese and French-Canadian children.
mesh_terms: D000293:Adolescent; D000367:Age Factors; D002170:Canada; D002648:Child; D002657:Child Development; D002675:Child, Preschool; D003071:Cognition; D003431:Cross-Cultural Comparison; D004522:Educational Status; D005260:Female; D005602:France / Q000208:ethnology; D006801:Humans; D008297:Male; D011582:Psychological Theory; D012424:Rural Population; D012432:Rwanda; D012858:Size Perception; D014505:Urban Population