title: The performance of approved-school boys on the Gibson Spiral Maze.
mesh_terms: D000293:Adolescent; D000367:Age Factors; D006801:Humans; D007604:Juvenile Delinquency; D008297:Male; D009048:Motor Skills; D011340:Problem Solving; D011581:Psychological Tests / Q000592:standards; D013997:Time Factors