Weaver N J, Wardell F N, Martin F N
Am J Ment Defic. 1979 Mar;83(5):512-7.
Sixteen mentally retarded children who had normal hearing were examined with two tests of auditory sensitivity. One procedure employed a tangibly reinforced operant-conditioning paradigm for pure tones, and the other test was based on a modification of operant conditioning for obtaining speech-reception thresholds. The speech procedure, utilizing an attractive mechanical device in the form of a clown, proved to be effective and efficient for use with retarded children.