Hi 

I have a question related to calculation of the local gyrification index using FreeSurfer.  I have computed the LGI and checked the results successfully.  

I can get mean values of LGI for different ROI's using the command:

mri_segstats --annot my_subject_id lh aparc --i $SUBJECTS_DIR/my_subject_id/surf/lh.pial_lgi --sum lh.
aparc.pial_lgi.stats

But I would also like to get a single mean value of LGI for each hemisphere.  Please could you advise how best to find this. 

Thanks and best wishes

Jane Garrison

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