Figure 3

Results from population TTSR (see Section ‘ Tilt table test during spontaneous respiration (TTSR)’). Black line and shadowed area denote the median trend and the interquartile range of estimates across subjects. From left to right: interactions between {x_H(t),x_S(t)} (SAPV-HPV), {−x_R(t),x_H(t)} (RESP-HPV), {−x_R(t),x_S(t)} (RESP-SAPV). From top to bottom: time course of: (a)–(c) coherence γ_ik(t), (d)–(f) partial coherence γ_ik/z(t), (g)–(i) phase difference θ_ik(t) and (j)–(l) time delay${\mathcal{D}}_{\text{ik}}\left(t\right)$. Vertical lines denote early supine T_ES, head-up tilt T_HT and later supine T_LS conditions. Dashed lines in (a)–(c) represent the mean value of the threshold function used to assess the significance of coherence estimates.