We identified visual-spatial oscillatory responses in the theta, alpha, and gamma ranges. Specifically, MEG sensors near the occipital cortices showed significant theta (4–8 Hz), alpha (8–16 Hz), and gamma (64–74 Hz) activity from 0 to 250 ms, 300 to 550 ms, and 250 to 550 ms, post-stimulus respectively (Fig. 1A). Beta (18–24 Hz) activity was also identified around participants’ reaction time in sensors above motor cortices, but these motor responses were beyond the scope of this study.
