Fig. 3

Comparison of the frequency of occupancy rates between the two emotional circumstances. A–C Comparison of electroencephalogram (EEG) frequency activities during eating in the two virtual spaces. Three representative patterns of occupancy rate profiles under the CS (red line) and UCS (black line). The profiles were obtained by Fast Fourier Transform (FFT) analysis of the EEG signals (see Methods). Left: The two profiles are superimposed, and the four frequency bands that we focused on in the present study are shown. The four frequency bands are as follows: 4–8 Hz (theta), 8–12 Hz (alpha), 12–16 Hz (low beta), and 16–23 Hz (beta). Right: The profile under the UCS was subtracted from that under the CS to investigate the differences in EEG frequency activities. Note that areas surrounded by the line of profile and green line were calculated for every frequency band, and the differences in EEG frequency activities under the CS and UCS were named “differences in areal occupancy rate,” and the “differences in areal occupancy rate,” and used for analyses