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. 2026 Apr 1;20:1702124. doi: 10.3389/fnins.2026.1702124

Figure 6.

Twelve scatter plots arranged in a four-by-three grid show log-Gamma scale versus log-Gamma shape for resting, drawing, pointing, and peg tasks labeled by V1, V2, and V3. Each plot compares control (red) and pain (blue) groups, with inset line graphs showing probability density functions for MMS variables.

Gamma parameters for facial micro-movements across all regions V1, V2, V3 for all 4 tasks (resting, drawing, pointing, and peg) and for control (red dots) and pain (blue dots). Each dot represents a participant’s empirically estimated (Γshape, Γscale) measurement, spanning a family of PDFs for each participant. Insets show the gamma PDFs from the empirically estimated shape and scale parameters. Scatters are well fit by exponential curves, and as in the heart IBI case of Figure 5, the log–log representation is well fit by a tight linear negative correlation whereby as the gamma NSR decreases, the gamma shape increases (see Supplementary Table 2).