ABSTRACT
Event-related potential (ERP) contains both, the potential directly evoked in the brain by sensing the stimulus and the electric potential generated in the brain by the cognitive processes associated with the stimulus. The visual analysis of ERP is predominantly popular among cognitive psychologists, and for this an ERP signal is divided into positive and negative components. Most ERP studies concentrate on the amplitudes of one or more ERP components although amplitudes are dependent on the reference channel. The electroencephalography signals collected from the subjects, during stimulus presentation, often contain hundreds of trials. Even after pre-processing, the signal strength across all the channels varies significantly from one trial to another leading to large differences in the peak amplitude across the trials. The window size for mean amplitude measure should be smaller compared to peak amplitude measure. This will give a sharper resolution of the signal and a more realistic measure of ERP amplitude.
