Amplitude modulation following response in children as a clinical audiometric tool.

The current study was designed to investigate the clinical application of amplitude modulation following response (AMFR) in cochlear implant candidates. A new digital signal processor (DSP)-assisted PC-based hardware and software was developed to perform both simultaneous generation of amplitude-modulated stimuli and the recording, and synchronized signal processing of the electrode signals. Our first results show that AMFR can be recorded in adults as well as in children without any contamination by response-like stimulus artifacts. Very high sound pressure levels can be applied, allowing frequency-specific assessment of residual hearing. Response threshold detection, using spectral analysis, proved to be superior compared to visual evaluation of average time waveforms.