Abstract
Cross correlation analysis of auditory brain stem response (ABR) by means of the fast Fourier transform (FFT) was performed in normal subjects and its clinical significance was discussed.Cross correlation functions were computed between individual ABRs and each of following three kinds of normative ABR templates (nABR): (1) mean of ABR recordings from 30 normal males (MnABR), (2) mean of recordings from 30 normal females (FnABR) and (3) mean of MnABR and FnABR (MFnABR), because significant difference in wave V latency between MnABR and FnABR was observed. It was, therefore, subsequent that three kinds of cross correlation functions were obtained for each individual ABR. As the cross correlation index, R0 (correlation coefficient at 0msec), RM (maximal correlation coefficient) and DL (latency delay in msec) were adopted.Means and standard deviations of the parameters in normal subjects were compared among three kinds of cross correlation functions. From the results, evaluation of ABR waveform characteristics with cross correlation analysis using nABR of the same gender seems to be more significant than the analysis using MFnABR or using nABR of the other gender.
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