Verbal interactions: mothers and their retarded children vs mothers and their nonretarded children.
D000704:Analysis of Variance; D002675:Child, Preschool; D005260:Female; D006801:Humans; D008607:Intellectual Disability; D007804:Language Development; D009034:Mother-Child Relations; D010988:Play and Playthings; D013637:Tape Recording; D014705:Verbal Behavior