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  • Title: Sound lateralization and speech discrimination in patients with sensorineural hearing loss.
    Author: Kubo T, Sakashita T, Kusuki M, Kyunai K, Ueno K, Hikawa C, Wada T, Shibata T, Nakai Y.
    Journal: Acta Otolaryngol Suppl; 1998; 538():63-9. PubMed ID: 9879404.
    Abstract:
    Sound lateralization and speech discrimination abilities are both closely related to central auditory system function. In this study, we investigated the relationship between sound lateralization and speech discrimination in patients with sensorineural hearing loss (SNHL) of unknown aetiology or presbycusis. Interaural intensity difference (IID) and interaural time difference (ITD) discriminations were measured using a self-recording apparatus for dichotic sound presentation, and the means of bilateral maximum scores in speech discrimination tests were calculated. Subjects with normal sound lateralization had good speech discrimination scores above 70%, while those with abnormal sound lateralization had poor scores below 70%. Some patients, however, had good speech discrimination but abnormal sound lateralization. These findings were obtained in both IID and ITD discrimination tests. Furthermore, some subjects could not discriminate ITD, although all could discriminate IID. These findings suggest that sound lateralization ability may be affected more than speech discrimination in SNHL of unknown aetiology or in presbycusis.
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