Fig. 3. Auditory evoked potentials (AEP signals) ( dotted lines ) and retransformed signals based on the third coefficient of the third level of wavelet transform (with the biorthogonal 2.2 mother wavelet, solid lines ). Part A shows the average of all 190 AEP signals ( upper part ) and an AEP signal from a representative subject ( lower part ) with the corresponding retransformed signals, which resemble peak V of the brainstem response. Part B shows the average of the corresponding 190 “non-AEP” signals ( upper part ) and a typical “non-AEP” signal ( lower part ). In the “non-AEPs” and the corresponding retransformed signals, peak V of the brainstem response is absent.