Cortical auditory evoked potentials as an objective measure of behavioral thresholds in cochlear implant users.

Cortical auditory evoked potentials as an objective measure of behavioral thresholds in cochlear implant users.
Hear Res. 2015 May 7;
Authors: Visram AS, Innes-Brown H, El-Deredy W, McKay CM
Abstract
The aim of this study was to assess the suitability of using cortical auditory evoked potentials (CAEPs) as an objective tool for predicting behavioral hearing thresholds in cochlear implant (CI) users. Nine experienced adult CI users of Cochlear™ devices participated. Behavioral thresholds were measured in CI users across apical, mid and basal electrodes. CAEPs were measured for the same stimuli (50 ms pulse trains of 900-pps rate) at a range of input levels across the individual's psychophysical dynamic range (DR). Amplitude growth functions using global field power (GFP) were plotted, and from this the CAEP thresholds were extrapolated and compared to the behavioral thresholds. Increased amplitude and decreased latency of the N1-P2 response was seen with increasing input level. A strong correlation was found between CAEP and behavioral thresholds (r=0.93), implying that the cortical response may be more useful as an objective programming tool for cochlear implants than the auditory nerve response.
PMID: 25959269 [PubMed - as supplied by publisher]

Source: Hearing Research - May 7, 2015 Category: Audiology Authors: Visram AS, Innes-Brown H, El-Deredy W, McKay CM Tags: Hear Res Source Type: research