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Hi . Thank you for your prompt reply to my previous message. I'm trying to do a feat analysis for a sparse sampling design (TR=12seconds). In one of your previous messages you have suggested to handle data as a PET data, and to turn off prewhitening and any convolution models and to specify TR=1seconds EV - custom 3 columns format; The experimental design has 3 conditions + baseline condition. I was following your advice and the results can be seen here: ======================= the report: ftp://ftp.rotman-baycrest.on.ca/pub/anda/fsl/report.html The only thing that I do not undestand is that the activation map for some contrasts c3,c4,c5 ,c6 are completely blank. I have checked the report log file and I have found these 2 error/warning messages that maybe can explain the results? ============================================= The report log file : ftp://ftp.rotman-baycrest.on.ca/pub/anda/fsl/report.log +++++++++ An exception has been thrown Runtime error:- detected by Newmat: matrix is singular ++++++++++++++++ Warning: empty x range [0.5:0.5], adjusting to [0.495:0.505] Warning: empty x range [0.5:0.5], adjusting to [0.495:0.505] Warning: empty x range [0.5:0.5], adjusting to [0.495:0.505] Warning: empty x range [0.5:0.5], adjusting to [0.495:0.505] Warning: empty x range [0.5:0.5], adjusting to [0.495:0.505] Warning: empty x range [0.5:0.5], adjusting to [0.495:0.505] Warning: empty x range [0.5:0.5], adjusting to [0.495:0.505] Warning: empty x range [0.5:0.5], adjusting to [0.495:0.505] Warning: empty x range [0.5:0.5], adjusting to [0.495:0.505] Warning: empty x range [0.5:0.5], adjusting to [0.495:0.505] Warning: empty x range [0.5:0.5], adjusting to [0.495:0.505] Warning: empty x range [0.5:0.5], adjusting to [0.495:0.505] Warning: empty x range [0.5:0.5], adjusting to [0.495:0.505] Warning: empty x range [0.5:0.5], adjusting to [0.495:0.505] Warning: empty x range [0.5:0.5], adjusting to [0.495:0.505] Warning: empty x range [0.5:0.5], adjusting to [0.495:0.505] Warning: empty x range [0.5:0.5], adjusting to [0.495:0.505] Warning: empty x range [0.5:0.5], adjusting to [0.495:0.505] Warning: empty x range [0.5:0.5], adjusting to [0.495:0.505] Warning: empty x range [0.5:0.5], adjusting to [0.495:0.505] Warning: empty x range [0.5:0.5], adjusting to [0.495:0.505] Warning: empty x range [0.5:0.5], adjusting to [0.495:0.505] Warning: empty x range [0.5:0.5], adjusting to [0.495:0.505] Warning: empty x range [0.5:0.5], adjusting to [0.495:0.505] Warning: empty x range [0.5:0.5], adjusting to [0.495:0.505] Warning: empty x range [0.5:0.5], adjusting to [0.495:0.505] Warning: empty x range [0.5:0.5], adjusting to [0.495:0.505] Warning: empty x range [0.5:0.5], adjusting to [0.495:0.505] Warning: empty x range [0.5:0.5], adjusting to [0.495:0.505] Warning: empty x range [0.5:0.5], adjusting to [0.495:0.505] Warning: empty x range [0.5:0.5], adjusting to [0.495:0.505] Warning: empty x range [0.5:0.5], adjusting to [0.495:0.505] Warning: empty x range [0.5:0.5], adjusting to [0.495:0.505] Warning: empty x range [0.5:0.5], adjusting to [0.495:0.505] Warning: empty x range [0.5:0.5], adjusting to [0.495:0.505] Warning: empty x range [0.5:0.5], adjusting to [0.495:0.505] Warning: empty x range [0.5:0.5], adjusting to [0.495:0.505] Warning: empty x range [0.5:0.5], adjusting to [0.495:0.505] Warning: empty x range [0.5:0.5], adjusting to [0.495:0.505] Warning: empty x range [0.5:0.5], adjusting to [0.495:0.505] Warning: empty x range [0.5:0.5], adjusting to [0.495:0.505] Warning: empty x range [0.5:0.5], adjusting to [0.495:0.505] Warning: empty x range [0.5:0.5], adjusting to [0.495:0.505] Warning: empty x range [0.5:0.5], adjusting to [0.495:0.505] Warning: empty x range [0.5:0.5], adjusting to [0.495:0.505] Warning: empty x range [0.5:0.5], adjusting to [0.495:0.505] Warning: empty x range [0.5:0.5], adjusting to [0.495:0.505] Warning: empty x range [0.5:0.5], adjusting to [0.495:0.505] Thank you again for your help. Anda