title: A twofold failure to replicate the results of O'Connor and Hermelin in discriminative learning with reversal in the case of mentally retarded children.
mesh_terms: D002648:Child; D002675:Child, Preschool; D003118:Color Perception; D004193:Discrimination Learning; D004495:Education of Persons with Intellectual Disabilities; D005556:Form Perception; D006801:Humans; D012193:Reversal Learning; D012858:Size Perception; D014705:Verbal Behavior