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>1. Since my stimulus duration is not an integer number of seconds, would >FSL accept non-integer numbers, i.e. would something like this work? > > 0 1.7 1 > 4.7 1.7 1 >15.4 1.7 1 Yes. >2. I am not sure I understand the role of the number in the last column. >What are the possible values one could use and how are these chosen? THis modulates the height of the regressor. In most cases, it is simply 1 but if you have a parametric modulation, then you might change this value. Hope this helps. Joe -------------------- Joseph T. Devlin, Ph. D. FMRIB Centre, Dept. of Clinical Neurology University of Oxford John Radcliffe Hospital Headley Way, Headington Oxford OX3 9DU Phone: 01865 222 738 Email: [log in to unmask]