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Francart, Tom; Brokx, Jan; Wouters, Jan (2009)
Publisher: Springer-Verlag New York Inc.
Languages: English
Types: Article
Subjects: Aged, Middle Aged, Loudness Perception, Article, Cues, Differential Threshold, Auditory Threshold, Time Factors, Sound Localization, Acoustic Stimulation, Cochlear Nerve, Hearing, Adult, Cochlear Implants, Humans, Child, Preschool

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mesheuropmc: otorhinolaryngologic diseases, psychological phenomena and processes, sense organs
The interaural time difference (ITD) is an important cue to localize sound sources. Sensitivity to ITD was measured in eight users of a cochlear implant (CI) in the one ear and a hearing aid (HA) in the other severely impaired ear. The stimulus consisted of an electric pulse train of 100 pps and an acoustic filtered click train. Just-noticeable differences (JNDs) in ITD were measured using a lateralization paradigm. Four subjects exhibited median JNDs in ITD of 156, 341, 254, and 91 mus; the other subjects could not lateralize the stimuli consistently. Only the subjects who could lateralize had average acoustic hearing thresholds at 1,000 and 2,000 Hz better than 100-dB SPL. The electric signal had to be delayed by 1.5 ms to achieve synchronous stimulation at the auditory nerves.

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