Central Auditory Processing of Temporal and Spectral-Variance Cues in Cochlear Implant Listeners
Fig 1
Characterization of CI peripheral filters.
(A) Electrically evoked compound action potential (ECAP) filters with Gaussian fits. Spread of excitation profiles are shown for three probe electrodes (pE7, pE11, pE15) in listener CI 5. ECAP N1-P1 amplitudes and Gaussian fits are indicated with circles and lines, respectively. (B) Goodness of fit. R2 between the measured filter and the Gaussian function for each tested probe electrode in all CI listeners (different colors) are shown. The black dashed line demarcates where fits are equivalent to or higher than R2 = 0.8. (C) Standard deviation. Peripheral filter bandwidth (σ) was estimated as a function of probe electrode. Each colored, dashed line corresponds to the average standard deviation across probes per CI listener. Based on these data we estimated a protected band [pb; shaded region in (A)] of ±3 electrodes to best separate peripheral and central masking effects (see text for details).