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Oh, I think the correct line is: D.indsample(0) Vladimir On Thu, Apr 22, 2010 at 8:06 PM, Vladimir Litvak <[log in to unmask]> wrote: > Hi Lluis, > > If you did the epoching via the standard GUI then your stimulus > should be at time 0, which according to your description should be the > middle of the trial. If you want to know the corresponding index you > can do: > > D = spm_eeg_load(filename); > D.indtime(0); > > Vladimir > > On Thu, Apr 22, 2010 at 8:02 PM, Lluis Fuentemilla > <[log in to unmask]> wrote: >> Hi Vladimir, >> >> I'm analysing some MEG/EEG data with SPM. Normal epoching and preprocessing. >> >> I epoched the data into a long 2sec window but my event of interest comes at >> second 1. Meaning then that I have -1000ms of baseline and 1000 of >> post-stimuli data. Data was originally collected at 460Hz and I downsampled >> to 300Hz after epoching. This means I have 660 timepoints. That's actually >> what I got from SPM. >> >> I'd like to know if I should then expect to have my stimuli onset at >> timepoint 330 (660/2)? Or SPM does some sort of recalculation of the epoched >> data that I could be misleading when transferring it to matlab. >> >> Many thanks for your help! Hope everything is ok in London. >> >> Best wishes, >> >> Lluís >> >> >> >> >> >> >> >