[Detection of auditory brainstem responses(ABR) threshold with statistical synchrony measure].

Using the method of J. Fridman and his colleagues, a statistical test of auditory brainstem responses (ABR) for detecting auditory threshold has been presented. The synchrony measure (SM) which represents the degree of reproducibility for group averages was used to calculate the selected Fourier components of the group averages from phase variance. The sensitivity of the test was demonstrated on 35 cases with normal ABRs with 60 and 45 dB SL stimulus intensity and in the absence of stimulus from the ipsilateral recordings. The SM of all cases with normal ABR at 60 and 45 dB SL overstopped those in the absence of stimulation. The same procedure was applied to 15 ears with cochlear hearing-loss with (4 ears) and without (9 ears) recruitment and two ears with relatively normal hearing threshold (less than 30 dB BL). Six out of nine ears without recruitment had the SM value at 60 dB SL. stimulus intensity, significantly lower than those with normal ABR.