On 26 May 2006, at 15:29, Eyleen Zhang wrote:
> Thanks Steve. I already have featquery running in batches.
> Just want to clarify about the peristimulus plot data. For my
> purposes, I would like to compute how much each EV contribute to
> the signal change in one particular contrast.
The best thing is to simply use the EV values multiplied by the
PPheight of that EV from the design.mat header - much easier!
Cheers.
> When I click on the Z stats image of that contrast, there is full
> plots and peristimulus plots. Are the data in peristimulus plot
> essentially the same as the full plot data, except that they are in
> seconds instead of time points? Are both data accounted for
> hemodynamic lag?
> If so, can I just pull the raw data from peristimulus plot, and
> calculate signal change from there (assuming the baseline signal is
> 10000)? Or is there a better way to do this?
>
> Eyleen
>
>
> On 5/26/06, Steve Smith <[log in to unmask]> wrote:
> Hi, yes the best thing is to use featquery. As long as you're not
> using windows, when you press GO on featquery, it tells you the
> command-line call it made - then you can easily work out how to call
> it yourself from the command line. If you're using windows, shame on
> you, but you can still get the syntax by just typing "featquery" in
> the terminal.
>
> Cheers, Steve.
>
>
> On 25 May 2006, at 22:44, Eyleen Zhang wrote:
>
> > Hi there,
> > I was using avwmeants to extract timeseries from lower level
> > filtered_functional_data, and I manually matched them to my
> > stimulus onset
> > time. I want to calculate the percent signal change in the ROI
> > corresponding
> > to each group of stimuli. Then I realize there is no way I can take
> > account
> > of the lag between the stimulus and the actual hemodynamic flow, is
> > there?
> >
> > In order to get the "real" signal change, do I have to run
> > featquery and
> > look at the peristimulus plot? If so, is there any quick way to run
> > it over
> > the command line? Since I have lots of contrasts, featquery simply
> > takes too
> > long to run for each .feat input.
> >
> > Thanks a lot.
> > Eyleen
> > --
> > Eyleen Zhang
> > Department of Psychology
> > Brandeis University
> > Waltham, MA 02454
>
>
> ----------------------------------------------------------------------
> --
> ---
> 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
> ----------------------------------------------------------------------
> --
> ---
>
>
>
> --
> Eyleen Zhang
> Department of Psychology
> Brandeis University
> Waltham, MA 02454
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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
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