Three single-channel and three multichannel cochlear implant patients were tested with warble tone audiometry and with part of the Minimal Auditory Capabilities (MAC) battery. Patients were also asked to report on their devices. The ratio of House result to Melbourne result was calculated for each MAC battery test. Many tests scarcely discriminated between the two sets of patients, but some tests discriminated sharply; these latter were open set tests of speech understanding.
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