Dear Dr. Yan and Dr. McLaren,

I have encountered a similar problem, and I was wondering whether you have resolved the issue.
I have two conditions each of which has one parametric modulator, and regressors include onset_condA, pmod_condA, onset_condB, pmod_condB, baseline(fixation), 6 head motion parameters X 3 sessions.


I first ran following code,

P.subject='Test';
P.directory=pwd;
P.VOI=[pwd filesep 'Thal_mask.nii'];
P.Region='Thal'
P.Estimate=1;
P.contrast=0;
P.extract='eig';
P.Tasks={'1' 'condA' 'condB' 'base'};
P.Weights=[];
P.analysis='psy';
P.method='cond';
P.CompContrasts=1;
P.Weighted=0;
P.ConcatR=0;
P.preservevarcorr=0;
P.Contrasts(1).name='condArate';
P.Contrasts(1).left={'condA'};
P.Contrasts(1).right={'None'};
P.Contrasts(1).Contrail={'condA_rate^1'}'
P.Contrasts(1).STAT='T';
P.Contrasts(2).name='condBrate';
P.Contrasts(2).left={'condB'};
P.Contrasts(2).right={'None'};
P.Contrasts(2).Contrail={'condB_rate^1'}'
P.Contrasts(2).STAT='T';



And I got this error message:

SPM12: spm_est_non_sphericity (v6827) 18:11:27 - 01/12/2017
========================================================================
Estimation Failed
Warning: Missing conditions!!! Invalid Contrast
Invalid Contrast
Warning: Missing conditions!!! Invalid Contrast
Invalid Contrast
PPI Contrasts were not estimated for some reason.


So, I modified the names of task conditions as they appeared in spm.xX.name:

P.Tasks={'0' 'condA_sess1' 'condA_rate_sess1^1' 'condB_sess1' 'condB_rate_sess1^1' 'condA_sess2' 'condA_rate_sess2^1' 'condB_sess2' 'condB_rate_sess2^1' 'condA_sess3' 'condA_rate_sess3^1' 'condB_sess3' 'condB_rate_sess3^1'};
P.Weights=[];
P.analysis='psy';
P.method='cond';
P.CompContrasts=1;
P.Weighted=0;
P.ConcatR=0;
P.preservevarcorr=0;
P.Contrasts(1).name='condA_curious';
P.Contrasts(1).left={'condA_sess1' 'condA_sess2' 'condA_sess3'};
P.Contrasts(1).right={'None'};
P.Contrasts(1).Contrail={'condA_rate_sess1^1' 'condA_rate_sess2^1' 'condA_rate_sess3^1'}'
P.Contrasts(1).STAT='T';
P.Contrasts(2).name='condB_curious';
P.Contrasts(2).left={'condB_sess1' 'condB_sess2' 'condB_sess3'};
P.Contrasts(2).right={'None'};
P.Contrasts(2).Contrail={'condB_rate_sess1^1' 'condB_rate_sess2^1' 'condB_rate_sess3^1'}'
P.Contrasts(2).STAT='T';


But I got the following error message:

SPM12: spm_est_non_sphericity (v6827) 18:14:02 - 01/12/2017
========================================================================
Estimation Failed
PPI Contrasts were not estimated for some reason.



I can't figure out what is causing the problem and how to fix it.
Could you please help me?


Sincerely,
Diane.

Originally posted by Xinyuan Yan: