Spatial and Time Domain Feature of ERP Speller System Extracted via Convolutional Neural Network

Figure 6

ERP averaged over all trials and feature map of L₁ of H group. The format is the same as shown in Figure 4. (a) The grand averaged ERP of H group shows significant peak around P300 and P500 (rows 1, 5, 7, and 8). Correlation between ERP from adjacent electrodes shows high correlation related to specific time rage (P300 and P700) in (b), (d), (f), and (e).