Figure 1

Computational algorithm for ABR threshold detection. A. Series of auditory brainstem responses (ABRs) evoked by click stimuli delivered at decreasing intensities. The automated threshold detection method compares the peak amplitude of the signal versus the standard deviation of baseline noise (boxed areas). B. Plot of the signal-to-noise ratio is used to calculate the hearing threshold level when peak amplitude is four times the standard deviation of the baseline noise to ensure few false positives (inset).