Dear SPMers, I just done the 2nd level analysis in SPM5 and I see that my design matrix has empty columns. I found some post on the list which are about that but still I am not sure If I did my design properly or that SPM5 allows such a design. Could you help me with that ? Best regards, -- Artur Marchewka Department of Neurophysiology The Nencki Institute of Experimental Biology Pasteur 3, 02-093 Warsaw, Poland tel: +4822 5892392 fax: +4822 8225342 email: [log in to unmask] website: http://www.nencki.gov.pl/labs/pslab/index.htm