The Masking Level Difference (MLD) is a difference score which measures binaural release from masking. Masking level differences have been studied extensively in both normal and abnormal populations over the past decade and a half. Only recently has the effect of suspected auditory perceptual problems on MLD's been investigated. Profiles of three patients having extremely reduced masking level difference results are reported. It is suggested that tests of the MLD appear to be a useful adjunct of an evaluation battery for patients with presumed auditory perceptual problems.
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