Thanks Russ. This looks great!
- Kyle
-----Original Message-----
From: Russ Poldrack [mailto:[log in to unmask]]
Sent: Friday, November 14, 2003 8:05 PM
To: Kyle Simmons
Cc: [log in to unmask]
Subject: Re: peristimulus timecourse for a single voxel ROI
Kyle - you can do this with the command-line version of the roi
extraction routine from my toolbox. if you do:
data=spm_roi_graph_full_avg(...)
then data.time_course will contain the timecourses for each voxel in
the roi. use 'help spm_roi_graph_full_avg' to figure out the
arguments. also, note that the toolbox directories may not show up by
default in your matlab path, so you may need to add it explicitly to
use the program on the MATLAB command line.
cheers
russ
On Friday, November 14, 2003, at 04:59 PM, Kyle Simmons wrote:
> Dear SPMers,
>
> I have data from an event-related FMRI study (TR = 2 seconds) in which
> participants viewed three different categories of object pictures
> while in
> the scanner. What I want to do now is extract a separate peristimulus
> time
> plot for each voxel in a functionally defined region of interest.
> Please
> note that I do not need the average activity across all the voxels in
> the
> ROI, but rather the activity associated with each individual voxel in
> the
> ROI. I can acquire the peristimulus time course averaged across the
> voxels
> in an ROI using Russ Poldrack's ROI toolbox. What I'd like to be able
> to
> do now is to get the same type of information from each voxel
> separately.
> It would be even better if I could obtain the (deconvolved)
> peristimulus
> timecourse for each voxel in the ROI for each individual stimulus
> presentation (i.e., impulse). Is either of these options possible? If
> so,
> how? Could either accessing variables in the ROI Toolbox, or
> modifying the
> Toolbox's output make these data available?
>
> Thanks,
> Kyle
>
|