Hi Paul,

oh yes, you are right. The error should stem from 1dcat and not from 3dmaskdump.
As I understand you, the problem stems from a limitation of the code for handling .1D files. It is not a bug, just a "limitation" so to speak.

You asked for the reason why I play around with such a massive amount of voxels. I have two ROIs which span across the whole cerebral cortex. Consequently, the ROIs are very huge and contain a massive amount of voxels.

I computed two variables/measurements on a voxel-based level. My aim is to compare these voxel-based variables across all subjects using a Pearson correlation. Thats why I dealt with two .1D or .txt files where each file contains a massive number of numeric values.

But you are right, extracing the values for each subject individually to subsequently load these files into Python via a for loop (and finally add them all together into a list or array) solves the problem too.

Philipp