Fig. 3
From: A machine learning approach to predict perceptual decisions: an insight into face pareidolia
Feature extraction procedure: a A typical epoch of EEG channels. Red vertical line denotes stimulus onset. b Time–frequency representation (TFR) of one EEG channel (here P7, chosen randomly) obtained by convoluting the EEG signal with complex Morlet wavelet. The prestimulus period was segmented into nonoverlapping 74 short windows of 10 ms each. Similarly, frequency band segmentation also produced five segments by band-wise averaging of each frequency point within individual frequency band (see Materials and methods). c Feature dimension of time–frequency power spectrum (TFPS) that was extracted from all 64 EEG electrodes