We describe a recently proposed denoising of the ongoing EEG based on a wavelet decomposition scheme. It will be shown how the method allows the visualization of single trial human evoked potentials, stressing their amplitude and latency variability from trial to trial. Moreover we will apply the method to rat's auditory evoked potentials to study systematic changes in the single-trial responses, such as habituation and sensitization. Since the method is parameter free (i.e. it does not need to be adapted to the particular characteristics of each recording), implementations in clinical settings are imaginable.
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