title: Double-alternation learning by retardates.
mesh_terms: D000293:Adolescent; D000328:Adult; D000818:Animals; D005260:Female; D000882:Haplorhini; D006801:Humans; D008607:Intellectual Disability; D008297:Male; D011340:Problem Solving; D011821:Raccoons; D014163:Transfer, Psychology; D014706:Verbal Learning