Try running

cd $FREESURFER_HOME/subjects/fsaverage4/surf

mris_left_right_register lh.sphere rh.sphere lh.sphere.left_right rh.sphere.left_right

mris_apply_reg --src-label your.lh.label --trg your.rh.label -streg lh.sphere lh.sphere.left_right

I'm not 100% sure that this will do the right thing, so check your results.

On 5/26/17 5:18 AM, Meiling Li wrote:

Dear freesurfer experts

I created a binary mask on fsaverage4(eg: lh.mask.fs4.mgh) with 30 vertices included in the mask on the left hemisphere, how can i obtain a symmetric mask on the right hemisphere that covered the same regions like the mask on the left hemisphere?

Thanks! Meiling

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