did not reach statistical significanceP = 0.1699
In the motion-only runs, numerical effects were observed in the same direction but did not reach statistical significance (relationship between mean FD and RMSE: t 25 = 1.41, P = 0.1699; relationship between mean FD and Pearson’s r : t 25 = -1.13, P = 0.2708), likely due to the small sample size.