NDLI: Spectral and temporal measures in hybrid cochlear implant users: on the mechanism of electroacoustic hearing benefits.

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Golub, Justin S. Won, Jong Ho Drennan, Ward R. Worman, Tina D. Rubinstein, Jay T.
Description	Country affiliation: United States Author Affiliation: Golub JS ( Virginia Merrill Bloedel Hearing Research Center, Department of Otolaryngology-Head and Neck Surgery, University of Washington, Seattle, Washington 98195, USA.)
Abstract	OBJECTIVE: Compare auditory performance of Hybrid and standard cochlear implant users with psychoacoustic measures of spectral and temporal sensitivity and correlate with measures of clinical benefit. STUDY DESIGN: Cross-sectional study. SETTING: Tertiary academic medical center. PATIENTS: Hybrid cochlear implant users between 12 and 33 months after implantation. Hybrid recipients had preservation of low-frequency hearing. INTERVENTIONS: Administration of psychoacoustic, music perception, and speech reception in noise tests. MAIN OUTCOME MEASURES: Performance on spectral-ripple discrimination, temporal modulation detection, Schroeder-phase discrimination, Clinical Assessment of Music Perception, and speech reception in steady-state noise tests. RESULTS: Clinical Assessment of Music Perception pitch performance at 262 Hz was significantly better in Hybrid users compared with standard implant controls. There was a near significant difference on speech reception in steady-state noise. Surprisingly, neither Schroeder-phase discrimination at 2 frequencies nor temporal modulation detection thresholds across a range of frequencies revealed any advantage in Hybrid users. This contrasts with spectral-ripple measures that were significantly better in the Hybrid group. The spectral-ripple advantage was preserved even when using only residual hearing. CONCLUSION: These preliminary data confirm existing data demonstrating that residual low-frequency acoustic hearing is advantageous for pitch perception. Results also suggest that clinical benefits enjoyed by Hybrid recipients are due to improved spectral discrimination provided by the residual hearing. No evidence indicated that residual hearing provided temporal information beyond that provided by electric stimulation.
File Format	HTM / HTML
ISSN	15317129
e-ISSN	15374505
DOI	10.1097/MAO.0b013e318241b6d3
Journal	Otology & Neurotology
Issue Number	2
Volume Number	33
Language	English
Publisher	Lippincott Williams & Wilkins
Publisher Date	2012-02-01
Publisher Place	United States
Access Restriction	Open
Subject Keyword	Psychoacoustics Research Support, N.i.h., Extramural Cross-sectional Studies Pitch Discrimination Discipline Otolaryngology Audiometry, Pure-tone Auditory Threshold Acoustic Impedance Tests Physiology Cochlear Implants Auditory Perception Speech Perception
Content Type	Text
Resource Type	Article
Subject	Otorhinolaryngology Sensory Systems Neurology (clinical)

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