Fig. 4

Changes in functional connectivity of parietooccipital region before and after treatments. A–E Comparison of coherence before and after treatment both in sham group and tDCS group of VS patients with sleep cycles, including delta (A), theta (B), alpha power (C), beta power (D) and gamma power (E). F–J Comparison of coherence before and after treatment both in sham group and tDCS group of VS patients without sleep cycles, including delta (F), theta (G), alpha power (H), beta power (I) and gamma power (J). K–O Comparison of PLV before and after treatment both in sham group and tDCS group of VS patients with sleep cycles, including delta (K), theta (L), alpha power (M), beta power (N) and gamma power (O). P–T) Comparison of PLV before and after treatment both in sham group and tDCS group of VS patients without sleep cycles, including delta (P), theta (Q), alpha power (R), beta power (S) and gamma power (T). Electrode number: 5,6,7,8,18,19,,20,21,22,23,24,25,26,27, 30,31,32,33,36,37,38,39,44,45,46,47,57. *P < 0.05, n.s: no significant difference; P values were determined using analysis of covariance (ANCOVA) and age was included as a covariate; Coh: coherence; PLV: phase locking value; tDCS: transcranial direct current stimulation; VS: vegetative state