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July 06, 2021 11:26AM
Hello,

I am trying to use the TENT function to run an FIR analysis. I did this using afni_proc:

afni_proc.py -subj_id s$sub \
-script proc.s$sub.3conds_norming_tent \
-out_dir s$sub.3conds_norming_tent.results \
-dsets func/sub-s${sub}_ses-01_task-combo_run-0*_bold.nii.gz \
-copy_anat anat/anatSS.s${sub}.nii \
-anat_has_skull no \
-blocks tshift align volreg mask blur scale regress \
-tshift_opts_ts -tpattern alt+z \
-volreg_align_to third \
-volreg_zpad 4 \
-volreg_interp -heptic \
-volreg_align_e2a \
-mask_apply anat \
-blur_to_fwhm -blur_size 6.0 \
-regress_bandpass .008 99999 \
-regress_stim_times \
timingFiles/sub${sub}_imagine_amb_norming_tent.txt \
timingFiles/sub${sub}_imagine_att_norming_tent.txt \
timingFiles/sub${sub}_imagine_rel_norming_tent.txt \
-regress_stim_labels \
amb att rel \
-regress_stim_types times times times \
-regress_basis_multi 'TENT(0,18,10)' 'TENT(0,18,10)' 'TENT(0,18,10)' \
-regress_opts_3dD \
-gltsym 'SYM: +.5*att +.5*rel -amb' \
-gltsym 'SYM: +att -rel' \
-glt_label 1 UNAMBvsAMB \
-glt_label 2 ATTvsREL \
-jobs 24 \
-regress_est_blur_epits \

When I went to analyze the betas output in the stats, I found that for all subjects, ROIs, and conditions, my betas at time 0 were extreme relative to the other time points. For example:

File Sub-brick Mean_1
stats.s104+orig[1,3,5,7,9,11,13,15,17,19] 0[amb#0_Coe] -112.195664
stats.s104+orig[1,3,5,7,9,11,13,15,17,19] 1[amb#1_Coe] 0.551796
stats.s104+orig[1,3,5,7,9,11,13,15,17,19] 2[amb#2_Coe] 0.063248
stats.s104+orig[1,3,5,7,9,11,13,15,17,19] 3[amb#3_Coe] 0.018582
stats.s104+orig[1,3,5,7,9,11,13,15,17,19] 4[amb#4_Coe] 0.149465
stats.s104+orig[1,3,5,7,9,11,13,15,17,19] 5[amb#5_Coe] 0.360442
stats.s104+orig[1,3,5,7,9,11,13,15,17,19] 6[amb#6_Coe] 0.363047
stats.s104+orig[1,3,5,7,9,11,13,15,17,19] 7[amb#7_Coe] 0.374584
stats.s104+orig[1,3,5,7,9,11,13,15,17,19] 8[amb#8_Coe] 0.316820
stats.s104+orig[1,3,5,7,9,11,13,15,17,19] 9[amb#9_Coe] 0.255430
File Sub-brick Mean_1
stats.s105+orig[1,3,5,7,9,11,13,15,17,19] 0[amb#0_Coe] 86.534339
stats.s105+orig[1,3,5,7,9,11,13,15,17,19] 1[amb#1_Coe] -0.072039
stats.s105+orig[1,3,5,7,9,11,13,15,17,19] 2[amb#2_Coe] 0.605378
stats.s105+orig[1,3,5,7,9,11,13,15,17,19] 3[amb#3_Coe] 0.593267
stats.s105+orig[1,3,5,7,9,11,13,15,17,19] 4[amb#4_Coe] 0.472463
stats.s105+orig[1,3,5,7,9,11,13,15,17,19] 5[amb#5_Coe] 0.326305
stats.s105+orig[1,3,5,7,9,11,13,15,17,19] 6[amb#6_Coe] 0.071705
stats.s105+orig[1,3,5,7,9,11,13,15,17,19] 7[amb#7_Coe] 0.268122
stats.s105+orig[1,3,5,7,9,11,13,15,17,19] 8[amb#8_Coe] 0.072327
stats.s105+orig[1,3,5,7,9,11,13,15,17,19] 9[amb#9_Coe] -0.000413
File Sub-brick Mean_1
stats.s106+orig[1,3,5,7,9,11,13,15,17,19] 0[amb#0_Coe] -18.552854
stats.s106+orig[1,3,5,7,9,11,13,15,17,19] 1[amb#1_Coe] -0.021274
stats.s106+orig[1,3,5,7,9,11,13,15,17,19] 2[amb#2_Coe] -0.044923
stats.s106+orig[1,3,5,7,9,11,13,15,17,19] 3[amb#3_Coe] -0.024933
stats.s106+orig[1,3,5,7,9,11,13,15,17,19] 4[amb#4_Coe] -0.114865
stats.s106+orig[1,3,5,7,9,11,13,15,17,19] 5[amb#5_Coe] -0.240969
stats.s106+orig[1,3,5,7,9,11,13,15,17,19] 6[amb#6_Coe] -0.208894
stats.s106+orig[1,3,5,7,9,11,13,15,17,19] 7[amb#7_Coe] -0.188989
stats.s106+orig[1,3,5,7,9,11,13,15,17,19] 8[amb#8_Coe] -0.184979
stats.s106+orig[1,3,5,7,9,11,13,15,17,19] 9[amb#9_Coe] -0.209463
File Sub-brick Mean_1
stats.s108+orig[1,3,5,7,9,11,13,15,17,19] 0[amb#0_Coe] 206.078016
stats.s108+orig[1,3,5,7,9,11,13,15,17,19] 1[amb#1_Coe] -0.542887
stats.s108+orig[1,3,5,7,9,11,13,15,17,19] 2[amb#2_Coe] 0.361305
stats.s108+orig[1,3,5,7,9,11,13,15,17,19] 3[amb#3_Coe] 0.384412
stats.s108+orig[1,3,5,7,9,11,13,15,17,19] 4[amb#4_Coe] 0.272852
stats.s108+orig[1,3,5,7,9,11,13,15,17,19] 5[amb#5_Coe] 0.322065
stats.s108+orig[1,3,5,7,9,11,13,15,17,19] 6[amb#6_Coe] 0.221116
stats.s108+orig[1,3,5,7,9,11,13,15,17,19] 7[amb#7_Coe] 0.054475
stats.s108+orig[1,3,5,7,9,11,13,15,17,19] 8[amb#8_Coe] 0.052189
stats.s108+orig[1,3,5,7,9,11,13,15,17,19] 9[amb#9_Coe] -0.064882

Am I right in thinking this is unusual? And, if so, is there any explanation as to why this might have happened or suggestions for ameliorating the situation?

Thanks!
Heather
Subject Author Posted

TENT function - extreme values at trial start

heatherb July 06, 2021 11:26AM

Re: TENT function - extreme values at trial start

Gang July 07, 2021 11:31AM

Re: TENT function - extreme values at trial start

rick reynolds July 13, 2021 04:54PM

Re: TENT function - extreme values at trial start

heatherb July 13, 2021 05:24PM

Re: TENT function - extreme values at trial start

rick reynolds July 13, 2021 05:30PM

Re: TENT function - extreme values at trial start Attachments

heatherb July 13, 2021 06:00PM

Re: TENT function - extreme values at trial start

rick reynolds July 13, 2021 09:17PM



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