I have a resting-state binary masks (.nii file of this mask) which needs to be parcelized into Brodmann Areas.How this can be done in brainstorm?

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Thanks for the clarification. Once you have computed the source using a volume source space. It is possible to import the .nii masks as Scouts, and these scouts will indicate which indices to mask on the source reconstruction.

MRI and a mask (left motor cortex)

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Scout created with mask.nii file, and its (236) indices, which indicate the source vertices in the Scout.
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This is when the source space is defined, so the number of vertices.
https://neuroimage.usc.edu/brainstorm/Tutorials/TutVolSource