title: Note of an error in "Action Concept Usage by nonretarded and retarded children on structured tasks with praise for performance".
abstract: An error in calculation of MAs of the moderately retarded subjects in the above study raises significant questions about the findings that their use of action concepts is less than that of mildly retarded subjects of the same MA. Their reduced performance may instead be attributable to some unknown extent to their lower MA.
mesh_terms: D000124:Achievement; D000367:Age Factors; D003071:Cognition; D006801:Humans; D008607:Intellectual Disability / Q000145:classification*; D007361:Intelligence Tests; D012057:Reinforcement, Verbal