Time courses from area V1 were extracted (Figure 3C), and the change in oscillatory power between grating and baseline periods from 1 to 100 Hz was calculated (Figure 3D). Whilst results show individual variability in peak frequencies and the strength of oscillatory power, on average, activity within visual area V1 displays a reduction in alpha/beta power (8–20 Hz), and an increase in gamma power (40–70 Hz). The MEG data, therefore display well-established patterns of alpha and gamma-band event-related synchronization and desynchronization within visual area V1 (Hoogenboom et al., 2006; Bonnefond and Jensen, 2015; Michalareas et al., 2016), which is a crucial first step in calculating reliable estimates of PAC (Aru et al., 2015).
