Figure 3.
Box plots of the measures of interaction predictability, Ix,Φ∖x→η, quantifying the degree of interaction between each brain process (x=δ, θ, α, σ, β) and the remaining brain processes in the prediction of the cardiac process η, computed in healthy controls (CTRL), in patients with severe sleep apnoea–hypopnoea syndrome (SAHS), and in the same patients studied after prolonged continuous positive airway pressure therapy (CPAP). For each measure, significantly non-zero interaction predictability is denoted by the hash symbol (p<0.01, Wilcoxon signed-rank test). *p<0.05 CTRL versus SAHS (Mann–Whitney U-test) or CTRL versus CPAP (Wilcoxon signed-rank test).