extracting vectors of stimulus onsets for fmri software

[James Keidel]

hey

if you have a variable with the onset times, you could also have a
variable with the condition for each time.  copy these both into
excel, sort by the condition variable, then paste the times for each
condition into spm...it's not perfect but probably easier than what
you are doing.  otherwise, like david said, write an excel macro to
remove empty space in a column; there are examples of this online.

within eprime, you could search the e-basic help for file handling and
have a little piece of script that wrote out files for each condition;
done correctly this file could be loaded directly into spm via a
matlab command and you would not have to deal with the gui much at
all.

JK

On Wed, Mar 31, 2010 at 2:45 PM, Jim <jjprisciandaro at gmail.com> wrote:
> 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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