Hi Freesurfer experts,  

I've done running a longitudinal analysis pipeline for individuals in 3 groups. Now, I need to get prepared for QDEC group analysis. I cp all groups of individuals to the same directory and each subject contains one base and multiple long files. I want to run "-qcache" option for the prep. Got a couple of questions here?

1) I failed to run "recon-all -s 001 -qcache", said: "missing 001/surf/lh.thickness", so for a longitudinal run, should I run "recon-all -s 001_base -qcache" or 'recon-all -s 001_ses-1.long.001_base" instead?

2) Where will the output be stored for each individual? 

3) To run multiple qcache in parallel, will the following code generate the same outputs as that I run each individually: " find . -type d -name '*_base" -exec bash -c 'for i in "$@"; do recon-all -s "$i" -qcache; done". 

Thank you so much!

Best, 

Qi