Hi, I am interested in using the beta series method (https://neuroscape.ucsf.edu/wp-content/uploads/publications/Rissman2004-Meas...) for intra-subject analysis. Is there a straightforward way to do this in FreeSurfer?

I attempted and the following analysis (code starting @ foreach) and an error appeared at the selxavg3-sess step: ERROR: condition ids are not contiguous

Should I include a positive contrast for each condition (i.e. instead of '-no-con-ok', use 'mkcontrast-sess -analysis $analysis -contrast $contrast -a $1_to_194') or is something else about the design erroneous? Thank you in advance for feedback.

Notes regarding the paradigm file: (1) treats each condition type as a unique event (i.e. second column consists of numbers 1:194; $Nconditions = 194) (2) stim weight == 1 (i.e. third column all ones)

foreach cortices ( lh rh )

mkanalysis-sess \ -fsd $fsd \ -surface fsaverage $cortices \ -fwhm $FWHM \ -event-related \ -paradigm $paradigm \ -nconditions $Nconditions \ -spmhrf 0 \ -TR $TR \ -refeventdur $EVENT_DUR \ -nskip $Nskip \ -hpf $HPF \ -analysis bsm.analyses.$cortices \ -per-run \ -nuisreg $MC_nuis -1 \ -tpexclude $MCR_censor \ -force

end

foreach cortices ( lh rh )

selxavg3-sess \ -s $SUBJECT \ -analysis bsm.analyses.$cortices \ -no-con-ok

end

------ Emily M. Hahn | Clinical-Computational Research Coordinator Division of Neurotherapeutics | A.A. Martinos Center for Biomedical Imaging Massachusetts General Hospital/Harvard Medical School