Fig 4. Brain regions in which standardized alpha-rhythm amplitude was significantly lower in the High group compared to the Low group.

Amplitude modulations during the memory item presentation period ((a): 0–4.2 s) and to the hold period ((b): 4.2–5.2 s) were compared between groups by double-tailed t-test (p < 0.05). The predominant region coincided well with the precuneus (PCu) based on the Desikan-Killiany atlas (Left below). A: anterior, P: posterior, L: left, R: right.