Abstract
Interaural time just noticeable differences (jnds) were obtained on a group of normal-hearing listeners and four groups of listeners with sensorineural hearing losses. These groups consisted of persons with moderate hearing loss (1) only in the low frequencies, (2) only in the high frequencies, (3) across the frequency range, and (4) only in one ear. The stimuli consisted of computer-generated narrow bands of noise, 450–550 Hz and 3750–4250 Hz, with the paradigm being constant stimulus two interval forced choice. Interaural intensity jnds were also obtained for the same two bands of noise with hearing-impaired listeners who performed poorly on the time discrimination task. The results indicated that (1) the presence of a sensorineural hearing loss inhibits normal processing of interaural time differences in a lateralization paradigm; (2) there are large individual differences in the amount of deficit in lateralization due to a hearing loss; (3) based on a limited number of subjects employed, there is no clear relationship between configuration of loss and performance on interaural time discrimination; and (4) poor performance on interaural time discrimination tasks does not mean that performance on interaural intensity discrimination tasks will also be poor.
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