Auditory Performance With simultaneous Intracochlear Multichannel Stimulation

Parkin, James L.; Randolph, Loren J.

doi:10.1002/lary.1991.101.4.379

Cited by 3 publications

(1 citation statement)

References 6 publications

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“…However, little is known about the effects of frequency per se on these relationships. Signals in the range of 4.0 to 0.5 ms per phase at frequencies ranging from 125 Hz to 1 kHz are most commonly used by the class of auditory-prosthesis processors that use filtered continuous signals for stimulation of the auditory nerve (e.g., Eddington, 1980;Schindler and Kessler, 1989;Parkin and Randolph, 1991 ). This paper reports data confirming previous findings from this and other laboratories concerning the nonmonotonic relationship between threshold and stimulus frequency for long-duration pulses.…”

Section: Introductionsupporting

confidence: 84%

Stimulus features affecting psychophysical detection thresholds for electrical stimulation of the cochlea. II: Frequency and interpulse interval

Pfingst

Morris

1993

The Journal of the Acoustical Society of America

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Psychophysical detection thresholds for electrical stimulation of the cochlea were measured in nonhuman primates (macaques) as part of a series of experiments exploring the stimulus features affecting detection. The monkeys were trained psychophysically using operant conditioning. One ear was treated with neomycin to destroy hair cells, and implanted with electrodes in the scala tympani and/or the cochlear wall. In experiment 1, detection thresholds were measured for trains of fixed-duration pulses and for sinusoids. For long-duration pulses (1 to 2 ms/phase), thresholds decreased as a function of frequency (pulse rate), reaching a minimum at a frequency between 125 and 210 pps, then increased as frequency was further increased. For shorter duration pulses, thresholds usually decreased monotonically as a function of frequency but sometimes showed a slight increase as a function of frequency near the highest frequencies tested. Typically slopes of the threshold versus frequency functions for fixed-duration pulses were equal to or less than slopes of threshold versus frequency functions for sinusoidal signals, where frequency and phase duration covaried. Additional observations on two of the cases were made in experiments 2 and 3. In experiment 2, thresholds for pairs of pulses were measured as a function of interpulse interval. Thresholds decreased as a function of interpulse interval up to intervals of 2 to 4 ms and then increased slightly. In experiment 3, thresholds were measured as a function of stimulus duration at two frequencies.(ABSTRACT TRUNCATED AT 250 WORDS)

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Section: Introductionsupporting

confidence: 84%

Stimulus features affecting psychophysical detection thresholds for electrical stimulation of the cochlea. II: Frequency and interpulse interval

Pfingst

Morris

1993

The Journal of the Acoustical Society of America

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Profound deafness treated by the Ineraid multichannel intracochlear implant

et al. 1993

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AbstarctTwelve deaf adults and two deaf children were treated with the Ineraid (formerly Symbion) four channel intracochlear implant between September 1989 and October 1991 at Addenbrooke's Hospital in Cambridge. All were post-lingually totally deaf and had found themselves beyond the reach of hearing aids. The effect of the implant upon the patients ability to lip-read was tested with the speech tracking test, BKB sentences (comparable to CID sentences) and Boothroyd word lists (comparable to NU6 word lists). All patients showed an improvement in their ability to understand speech with the help of the implant. Discrimination of speech without lip-reading was tested with Boothroyd word lists and BKB sentences, eight patients (57 per cent) demonstrated some ‘open set’ speech discrimination. The acceptability of the carbon percutaneous pedestal is discussed from the patient's, audiologist's and surgeon's points of view.

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Multichannel (Ineraid®) cochlear implant update

1993

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From April 1984 to May 1991, 49 profoundly deaf patients received implantation of the Ineraid multichannel cochlear implant at the University of Utah. The auditory results of 48 patients indicated improvement in mean pure-tone performance to 500 Hz (32.9 +/- 10.1 dB), 1000 Hz (27.1 +/- 10.0 dB), and 2000 Hz (30.1 +/- 9.8 dB). This group of patients had mean performances of 61.2% on auditory-only environmental sounds (Minimum Auditory Capabilities [MAC] battery), 48.8% on auditory-only CID sentences, and 95.5% on auditory-plus-visual CID sentences. The percutaneous pedestal has been well-tolerated. Changes in the surgical skin incisions have been made. A home use speech therapy program has been developed on VHS tapes.

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Auditory Performance With simultaneous Intracochlear Multichannel Stimulation

Cited by 3 publications

References 6 publications

Stimulus features affecting psychophysical detection thresholds for electrical stimulation of the cochlea. II: Frequency and interpulse interval

Stimulus features affecting psychophysical detection thresholds for electrical stimulation of the cochlea. II: Frequency and interpulse interval

Profound deafness treated by the Ineraid multichannel intracochlear implant

Multichannel (Ineraid®) cochlear implant update

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