Figure 4

Autonomic nerve activities assessed by the frequency analyses of electrocardiography. Low-frequency power (A; LF), high-frequency power (B; HF), and LF/HF ratio (C) were assessed before (open columns) and after (closed columns) the first and second magnetoencephalography (MEG) sessions. Data are presented as means and SEM (n = 9). #P < 0.10 (paired t-test).