The associations between behaviors of cognitive systems and noise amplitude and the average system degree.

(A) Mean of the functional effects induced by stimulating regions in a single system (〈fe〉) versus the noise amplitude. (B) Standard deviation of the functional effects induced by stimulating regions in a single system (std (fe)) versus the noise amplitude. (C) Mean of the structural effects induced by stimulating regions in a single system (〈se〉) versus the noise amplitude. (D) Standard deviation of the structural effects induced by stimulating regions in a single system (std(se)) versus the noise amplitude. (E) (F) (G) Structural effects versus functional effects of cognitive systems at various noise amplitudes (10⁻⁹, 10⁻⁶, 10⁻³). Note that the brain regions are grouped into 4 cognitive systems, as indicated by the different colors. The colored areas represent the convex hulls of data points in the systems. The lines and points reflect the measures averaged over 30 realizations. (H) Structural properties of each cognitive system. The colored bars indicate the maximum and minimum structural degree of regions in the systems. The gray dots and error bars represent the mean and standard deviation of the structural degree in the systems.