This original study investigates an underexplored neural parameter in cochlear implant (CI) users—auditory nerve refractoriness—and its implications for temporal processing efficiency in prelingual children. Using ECAP-based amplitude growth and recovery functions, researchers measured minimum and maximum inter-pulse intervals (IPI) across apical, middle, and basal cochlear regions in 21 MedEl CI users aged 2–13 years. Findings reveal a region-specific pattern, with the apical region showing a minimum effective IPI of 500 μs, while the middle and basal regions demonstrated significant recovery at 400 μs.
All three regions displayed a linear rise in response amplitude with increasing IPI, indicating robust temporal sensitivity. These results collectively refute the hypothesis of uniform refractory behavior across the cochlea, highlighting region-dependent neural recovery characteristics.…
