Fig. 2

The grand average figures of event-related a power and b phase-locking analysis (1–13 Hz) in time–frequency domain in response to each dynamic FE categories which are given in figure, respectively: fearful, joyful, and neutral FEs. The parietal areas (p7–p8) were presented in the figure. a Delta and theta power in response to the emotional FEs (fearful and joyful FE) was higher than that of the neutral FE in the second time window that corresponds to the time between 1000 and 1800 ms for delta, 1000 ms and 1400 ms for theta (p < 0.05). In the first time window (0–400 ms), the right parietal-2 location (p8) had higher theta power (p < 0.05), while there was no hemispheric difference in the second time window (1000–1400 ms) (p > 0.05). In the time window between 0 and 250 ms that corresponds to the first time window, the right parietal-2 (p8) location had higher alpha power (p < 0.05), while there was no hemispheric difference in the second time window (1000–1250 ms) (p > 0.05). b Delta and theta phase-locking value in response to the fearful FE was higher than that of the joyful and the neutral FE in the second time window that corresponds to the time between 1000 and 1800 ms for delta, 1000 ms to 1400 ms for theta (p < 0.05). In the first time window (0–400 ms), the right parietal-2 location (p8) had a higher delta, theta, and alpha phase-locking value (p < 0.05), while there was no hemispheric difference in the second time window (p > 0.05). The X-axis represents time, and the Y-axis represents frequency; the point at which the stimulus arrives is marked as a zero point on the X-axis. p7–p8: parietal