extracting vectors of stimulus onsets for fmri software

[Jim]

Hi,

I was hoping to benefit from the experience of someone who uses e-
prime for fmri experiments and analyzes their data in SPM (or any
other software that requires input of vectors of stimulus onsets).

What is the simplest way to get vectors of stimulus onsets to SPM for
event related analyses (given that you have multiple stimulus types)?

So far, I have a variable created that gives the onset time of each
stimulus relative to the start of the scan. Then, I also have multiple
variables (one for each stimulus type) that give the onset times of
particular stimulus types in seconds. Unfortunately, though, when a
given stimulus occurs, its onset time is recorded in one of these
multiple variables whereas all other of these variables recieve a
blank space (by design). With this setup, I can copy and paste one of
these variables into SPM as a vector of onset times for a given
stimulus type and manually delete the spaces mentioned above -- what a
pain! There must be an easier way!

For example, can I export a text file that contains a vector of the
stimulus onset times for a single stimulus type (without spaces for
trials where that stimulus type did not occur)?

Thanks,
Jim

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