Binaural interference in a child: a case study.

A case study of a child (KB) who demonstrated binaural interference is reported. KB wore unilateral amplification from 1.6 to 4.6 years of age, at which time word-recognition scores under phones were markedly asymmetric, reflecting significantly better performance for the aided ear than the unaided ear, despite similar unaided pure-tone sensitivity. Suspecting the asymmetry in word-recognition performance might be the result of auditory deprivation, bilateral amplification was prescribed at 4.6 years of age. Three months later, adverse changes in the child's behavior were reported. At 5.3 years, significant interaural asymmetry was noted in word-recognition scores under phones, in unilateral-aided word-recognition scores (90% vs. 36%), and in the bilateral-aided score (56%), supporting the presence of binaural interference.