Abstract
Thresholds of on‐going interaural time difference (ITD) were obtained from normal‐hearing and hearing‐impaired subjects who had high‐frequency, sensori‐neural hearing loss. Utilizing several stimuli (a 500‐Hz sinusoid, a narrow‐band noise centered at 500 Hz, a 4000‐HZ tone amplitude‐modulated at 250 Hz, and a narrowband noise centered at 4000 Hz), four criteria for determining the level of presentation to each subject were employed: (1) Equal sound pressure level; (2) equal sensation level; (3) equal loudness; and (4) midline intracranial image. The ITD thresholds and slopes of the psychometric functions were elevated for hearing‐impaired subjects for the two high‐frequency stimuli in comparison to: (1) The subject's own low‐frequency thresholds and (2) data obtained from normal‐hearing subjects for stimuli presented with equal SPL interaurally. The ITD thresholds using stimuli level based on equal loudness and a centered image were slightly lower than those obtained using the equal SPL criterion.
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