Fig 3.

Group-level GLM activation maps showing unique brain activation spatial patterns during the wrist extension movement (red), unique activation during wrist flexion movement (blue), and shared activation patterns during extension and flexion. Group-level t-statistic images were created in MNI coordinates for the following contrasts: Wrist extension versus rest, wrist flexion versus rest, and wrist flexion versus wrist extension. Panels A and B show one statistical map containing unique brain activations during wrist extension only (red) and unique activations during wrist flexion only (blue), as well as brain activations shared in common during extension and flexion. t-statistic images were assessed for cluster-wise significance using a forming threshold corresponding to p < 0.001. Critical cluster sizes were 702 mm³ and 945 mm³ for wrist extension and wrist flexion, respectively. Panels C and D illustrate the lack of results from calculating the statistically significant difference of greater brain activation during extension versus that during flexion. Fig 3, Panels C/D shows that no regions (no red or no blue regions) survived the statistical significance test.