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HI - have you tried using the model Wizard, as suggested in the manual? This will do the basic setup for you. Steve. On 5 Jun 2009, at 19:03, Nicole Pelot wrote: > Hi, > > I have read the FEAT Perfusion documentation quite a few times now, > but I > still cannot figure out how to properly set up my EVs. I have a > block design > task: 56s/block, 7 blocks, alternating between rest and active > (start & > finish with rest). > > My main issue is with EV1. It clearly states that we should be > modeling > *rest* times, but that leads me to think of a block design with 0's > for > active and 1's for rest. However, the sample design seems to show > all 1's > for EV1. Also, what convolution should be applied? None? > > I've structured EV2 as I always do to correspond to my block design. > (On: > 56s; Off: 56s; Convolution: Double gamma). > > EV3, I chose "Interaction", and I made the mean of EV1 zero (but the > min of > EV2). > > Thank you, > > Nicole > --------------------------------------------------------------------------- Stephen M. Smith, Professor of Biomedical Engineering Associate Director, Oxford University FMRIB Centre FMRIB, JR Hospital, Headington, Oxford OX3 9DU, UK +44 (0) 1865 222726 (fax 222717) [log in to unmask] http://www.fmrib.ox.ac.uk/~steve ---------------------------------------------------------------------------