Sensitivity to Interaural Time Differences with Combined Cochlear Implant and Acoustic Stimulation

Other literature type, Article English OPEN
Francart, Tom ; Brokx, Jan ; Wouters, Jan (2008)
  • Publisher: Springer-Verlag
  • Related identifiers: doi: 10.1007/s10162-008-0145-8
  • Subject: Aged | Middle Aged | Loudness Perception | Cues | Article | Differential Threshold | Auditory Threshold | Time Factors | Sound Localization | Acoustic Stimulation | Cochlear Nerve | Hearing | Adult | Cochlear Implants | Humans | Child, Preschool
    mesheuropmc: otorhinolaryngologic diseases | sense organs | psychological phenomena and processes

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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