Hi Donald,
I truly appreciate your help in resolving the problem. I did a mistake in the last email, I have not got 10 s .......but 10 volumes with a TR=3 s, so 30 s.
Is the problem addressed by using spm_fmri_concatenate in this case? Otherwise, I will modify spm_estimate_ppi, like you say.
Thanks a lot.
Best regards.
Ilaria
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