Effect of sampling frequencies and averaging resolution on medical parameters of auditory brainstem responses.

The amplitude ratio and latency between peaks of the auditory brainstem response are widely used as medical parameters of response in the clinical assessment. Several methodological factors affect the medical parameters. The sampling frequency, the resolution of the averager and filtering of the signal are important factors. Typically the signal is highly over-sampled in the recording phase. The resolution of the averager should be as good as possible to ensure adequacy of the amplitude parameter. The latency parameter is more tolerant to the reduction of the sampling frequency, and the signal can be decimated down to 10 kHz to reduce computational complexity.