Dear Anne,

That is interesting. I get contrast invalid errors too, but gPPI runs fine. These contrast invalid errors that I see pertain to the localiser to adjust by rather than the gPPI contrasts themselves. The localiser that I am using is the 'Omnibus F-test for PPI Analyses' rather than the P.weighted=0 declared above (which specifies that the eigenvariate is to be extracted without using a localiser).

My issue pertaining to the VOI2 error file was resolved when I removed a member variable struct VOI2 {} from the parameters.mat. I am not sure where this empty cell array came from. It is consistent with a VOI2 (of the kind required for physiophysiological interaction or psychophysiophysiological interaction) being specified but no file being supplied. I will try to comment in relation to your error on your thread.

Many thanks,

Mark


Log File: Attention_Tutorial_PPPI_1_20_2019.log

PPPI Version: 13.1.4-17-2014
Parameters used:
Processing subject: Attention_Tutorial
VOI file : /-----/GLM/VOI_V2_1.mat
Output file will be: Attention_Tutorial_VOI_V2_1_gPPI_Attention_session#_cond_PPI_regressors.txt
Valid Contrast
Warning: Missing conditions!!! Invalid Contrast
Invalid Contrast
Warning: Missing conditions!!! Invalid Contrast
Invalid Contrast
Valid Contrast
Warning: Missing conditions!!! Invalid Contrast
Invalid Contrast
Warning: Missing conditions!!! Invalid Contrast
Invalid Contrast
Valid Contrast
Warning: Missing conditions!!! Invalid Contrast
Invalid Contrast
Warning: Missing conditions!!! Invalid Contrast
Invalid Contrast
ESS image 4 : ...written ess_0004.nii
spm{F} image 4 : ...written spmF_0004.nii
Saving SPM.mat : ...SPM.mat saved
Contrast : Omnibus F-test for PPI Analyses
Analysis : Psychophysiological Interactions
Extraction : eigenvariate
Tasks : _1_Stationary_No-Attention_Attention
Method : Condition Specific
VOI has 26 voxels in 3x3x3 space
VOI has 26 voxels in 3x3x3 space. This is in the the same space as the input data and functional mask.