Network states defined by envelope ICMs at different anesthesia depths. (A) Hierarchical clustering of the coupling matrices of individual animals and conditions within each frequency band revealed the emergence of distinct network states under light (L), medium (M), and deep (D) anesthesia. (B) Mean coupling matrices of the 3 network states. Areas which were only represented by one contact in some of the animals and for which no intra-areal coupling could be calculated are plotted in gray. (C) Mean correlations within (ig) and across (cg) groups of areas for the 3 network states. Within-group correlation exceeded cross-group correlation for all frequency bands in all 3 states (P < 0.05, KS-test, Bonferroni–Holm corrected). Abbreviations: EVis, early visual; HVis, higher visual; PP, posterior parietal; SoSe, somatosensory; Aud, auditory; A1, primary auditory cortex; AAF, anterior auditory field; ADF, anterior dorsal field; PPc, central posterior parietal cortex; PPF, posterior pseudosylvian field; PPr, rostral posterior parietal cortex; PSF, posterior suprasylvian fields; SII, sencondary somatosensory cortex; SIII, tertiary somatosensory cortex; SSY, suprasylvian field.