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So given the choice between no censoring and interpolated censoring, it is difficult. High motion has drawbacks for each. If no censoring is done, that will probably drive down the AC values

Good points, thats what I thought too. Since some subjects showed kinda heavy head motion now and then, I wanted to censore and interpolate instead of "losing" or reducing the autocorrelation due to head motion. Censoring plus interpolation probably leads to more realistic results.

Moreover, the optimal solution would probably depend on the individual subject too, that is, depending on the specific head motion and censoring. Of course, one cannot run different motion censoring thresholds for each subject to get the best out of this situation.

Anyway, thanks for your help so far, the topic is solved from my side.