Abstract
In the analysis of the ERP (event-related potential) the use of the oddball paradigm, single sweep recording of P 3 (P 300, most prominent positive peak in the ERP) is strongly required, bacause the waveform of P 3 may vary from each trial depending on psychological and recording conditions of the subject. As the child ERPs are contaminated with background EEG whose frequency overlaps with the P 3 in the ERP record, neither a single use of a band pass filter nor a mathematical model for the P 3 can not extract the waveform of the single trial P 3. This paper proposed a new method for extracting single trial P 3 in the child ERPs by combinational use of the band pass filter and the mathematical model of the P 3. The model parameters of each waveform were determined so as to minimize the square sums of the modeling errors by using an optimization technique of the Fletcher-Powell method. The proposed method was applied to the ERP data of nine normal children. The features of the P 3 waveforms were appropriately extracted by the use of the proposed method.
