Objective By analyzing the effect of residual noise levels(RNL)on the rate of auditory brainstem re-sponse(ABR)recognition and comparing the correlation between ABRs and 40 Hz auditory event related potentials(40 Hz AERPs)and cortical auditory evoked potential(CAEP)thresholds,to report the value of CAEP in forensic evalua-tion of hearing impairment.Methods Auditory electrophysiological tests were completed in 26 patients with hearing impairment(52 ears),and the maximal RNL in ABRs in both ears were measured and analyzed,as well as the correla-tion between ABRs and 40 Hz AERPs and CAEP thresholds.Results The effective recognition rate of ABR curve is 92.31％,CAEP can effectively identify whether the reaction is induced or not.1.The amplitude of CAEP response to 2 kHz short pure tone stimulation is higher than that of ABR.ABR and 1,2,the 40Hz AERP response threshold of kHz short pure tone stimulation was not correlated,and the difference was not statisticallysignificant(P＞0.05);ABR and CAEP inverse of 1 and 2 kHz short pure tone stimulation,there was no correlation between the threshold and the differ-ence was not tatist ically significant(P＞0.05);There is no correlation between the response threshold of 40Hz AERP and CAEP stimulated by 1,2 kHz short pure tone,and the difference is not statistically significant meaning(P＞0.05).Conclusion CAEPs are not easily affected by abnormal increase of RNL,and can yield consistent and reliable results with frequency specificity,with thresholds consistently correlated with other objective auditory measurements.CAEPs can be used as an alternative methods for forensic evaluation of hearing impairment in populations where ABR thresh-olds are unreliable due to abnormal increase of RNL.
residual noise levelcortical auditory evoked potentialauditory brainstem response40Hz audiotory event related potentialforensic identification of hearing impai
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