title: Cross-sectional study on reaction time of mentally retarded children.
mesh_terms: D000293:Adolescent; D000367:Age Factors; D002490:Central Nervous System / Q000503:physiopathology; D002648:Child; D002657:Child Development; D003430:Cross-Sectional Studies; D006801:Humans; D008607:Intellectual Disability / Q000503:physiopathology / Q000523:psychology*; D007360:Intelligence; D008297:Male; D009068:Movement; D009119:Muscle Contraction; D010775:Photic Stimulation; D011930:Reaction Time