Hello,

When running 3dDeconvolve for a gPPI analysis, should you include an interaction term for conditions of no interest?

For example, I am interested in how connectivity changes with a hippocampal ROI across four target conditions (hour, day, week, and month). In addition, I have modeled foil activation that is of no interest (stim_times 13) so that it is not included in the baseline. Do I still need the interaction term (stim_file 23)? Or should I leave it out and preserve a degree of freedom?

3dDeconvolve -input allruns_nobaseline+orig \
-polort A \
-num_stimts 23 \
-mask /usr/local/mridata/Consolidation_2019/atlases/Kirby/dil+orig \
-stim_file 1 /usr/local/mridata/Consolidation_2019/${i}/${i}.results.secondhalf.noblur/motion_short.1D'[0]' -stim_base 1 -stim_label 1 roll \
-stim_file 2 /usr/local/mridata/Consolidation_2019/${i}/${i}.results.secondhalf.noblur/motion_short.1D'[1]' -stim_base 2 -stim_label 2 pitch \
-stim_file 3 /usr/local/mridata/Consolidation_2019/${i}/${i}.results.secondhalf.noblur/motion_short.1D'[2]' -stim_base 3 -stim_label 3 yaw \
-stim_file 4 /usr/local/mridata/Consolidation_2019/${i}/${i}.results.secondhalf.noblur/motion_short.1D'[3]' -stim_base 4 -stim_label 4 dS \
-stim_file 5 /usr/local/mridata/Consolidation_2019/${i}/${i}.results.secondhalf.noblur/motion_short.1D'[4]' -stim_base 5 -stim_label 5 dL \
-stim_file 6 /usr/local/mridata/Consolidation_2019/${i}/${i}.results.secondhalf.noblur/motion_short.1D'[5]' -stim_base 6 -stim_label 6 dP \
-stim_file 7 /usr/local/mridata/Consolidation_2019/${i}/${i}.results.secondhalf.noblur/motion_deriv_short.1D'[0]' -stim_base 7 -stim_label 7 rolldx \
-stim_file 8 /usr/local/mridata/Consolidation_2019/${i}/${i}.results.secondhalf.noblur/motion_deriv_short.1D'[1]' -stim_base 8 -stim_label 8 pitchdx \
-stim_file 9 /usr/local/mridata/Consolidation_2019/${i}/${i}.results.secondhalf.noblur/motion_deriv_short.1D'[2]' -stim_base 9 -stim_label 9 yawdx \
-stim_file 10 /usr/local/mridata/Consolidation_2019/${i}/${i}.results.secondhalf.noblur/motion_deriv_short.1D'[3]' -stim_base 10 -stim_label 10 dSdx \
-stim_file 11 /usr/local/mridata/Consolidation_2019/${i}/${i}.results.secondhalf.noblur/motion_deriv_short.1D'[4]' -stim_base 11 -stim_label 11 dLdx \
-stim_file 12 /usr/local/mridata/Consolidation_2019/${i}/${i}.results.secondhalf.noblur/motion_deriv_short.1D'[5]' -stim_base 12 -stim_label 12 dPdx \
-stim_times 13 ../timing_files/${i}'_all_foils_tf_chop5.txt' 'TENT(0,14,8)' -stim_label 13 all_foils \
-stim_times 14 ../timing_files/${i}'_hour_targets_tf_chop5.txt' 'TENT(0,14,8)' -stim_label 14 hour_targets \
-stim_times 15 ../timing_files/${i}'_day_targets_tf_chop5.txt' 'TENT(0,14,8)' -stim_label 15 day_targets \
-stim_times 16 ../timing_files/${i}'_week_targets_tf_chop5.txt' 'TENT(0,14,8)' -stim_label 16 week_targets \
-stim_times 17 ../timing_files/${i}'_month_targets_tf_chop5.txt' 'TENT(0,14,8)' -stim_label 17 month_targets \
-stim_file 18 AllRuns_HIPP_Seed.1D -stim_label 18 Seed \
-stim_file 19 AllRuns_Interaction_timeseries_hour.1D -stim_label 19 PPIHour \
-stim_file 20 AllRuns_Interaction_timeseries_day.1D -stim_label 20 PPIDay \
-stim_file 21 AllRuns_Interaction_timeseries_week.1D -stim_label 21 PPIWeek \
-stim_file 22 AllRuns_Interaction_timeseries_month.1D -stim_label 22 PPIMonth \
-stim_file 23 AllRuns_Interaction_timeseries_foils.1D -stim_label 23 PPIFoils \
-jobs 16 \
-rout -tout \
-bucket fxnConnOutput


Thank you,
Catherine