Hi Robin, the sampling of the "high resolution temporal model" generated initially by feat_model when the model is processed is 0.05 seconds, so anything shorter than this may get lost. If you need shorter than this you could always edit feat_model.c and recompile it! Cheers, Steve. On Wed, 28 Apr 2004, Robin Goldman wrote: > Hi there, > > What is the minimum possible event duration (sub second?) that can be entered the 3 column > format? > > Thanks, > Robin > Stephen M. Smith DPhil Associate Director, FMRIB and Analysis Research Coordinator Oxford University Centre for Functional MRI of the Brain John Radcliffe Hospital, Headington, Oxford OX3 9DU, UK +44 (0) 1865 222726 (fax 222717) [log in to unmask] http://www.fmrib.ox.ac.uk/~steve