title: Social reinforcement effects on motor performance as a function of socio-economic status.
mesh_terms: D002648:Child; D002657:Child Development; D005190:Family; D005246:Feedback; D006801:Humans; D007389:Internal-External Control; D007721:Knowledge of Results, Psychological; D008297:Male; D009048:Motor Skills; D012056:Reinforcement, Social; D012201:Reward; D012649:Self Concept; D012923:Social Class; D013647:Task Performance and Analysis