Hi Martin,
Many thanks for your quick response. I've had a go at your suggestion, and still can't seem to achieve what I required. Perhaps you can spot where I'm going wrong?
I used the batch function to convert my smoothed image files to nifti format using SPM/Util/Convert 3D to 4D - this worked fine. I'm interested in the whole epoch so I didn't need to specify a time window etc. However, there wasn't a chance to apply additional smoothing during the conversion... I used the display/image as suggested, but in all honesty I'm not sure how this relates to what I want to obtain.
I've previously used data from my grandmean.mat by loading this as an object (using D=spm_eeg_load) then plotting topographies of conditions I'm interested in by using the command spm_eeg_plotScalpData(squeeze(mean(D(D.indchantype('EEG'), D.indsample(0):D.indsample(1.5), D.indtrial('dm_pure_cat')), 2)),D.coor2D(D.indchantype('EEG')),D.chanlabels(D.indchantype('EEG'))); which creates a topography fine. However, for display purposes it was suggested to me that smoothing the topographies somewhat may look nicer, and I'd like to try this.
You mention that I could alternatively access the nifti directly and create a custom plot - perhaps this would provide the functionality I require? Could you give me any ideas how I could achieve my aim this way?
Thanks again for your support,
Best Wishes,
Gemma.
Miss Gemma E. Barnacle
PhD Student
School of Psychology
Room 119, Zochonis Building
University of Manchester
M13 9PL.
web: http://www.psych-sci.manchester.ac.uk/students/GemmaEBarnacle
LinkedIn: https://www.linkedin.com/profile/view?id=330663041&trk=nav_responsive_tab_profile
twitter: @gem_e_b
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From: SPM (Statistical Parametric Mapping) <[log in to unmask]> on behalf of Martin Dietz <[log in to unmask]>
Sent: 08 July 2014 21:40
To: [log in to unmask]
Subject: Re: [SPM] Smoothing EEG topographies
Dear Gemma,
You can convert your topographies (dataset) to a nifti image. Here you can specify the time window or time point. You can then use display/image. Alternatively, you can access the nifti directly and create a custom plot.
With best wishes
Martin
> On 08 Jul 2014, at 19:19, "Gemma Barnacle" <[log in to unmask]> wrote:
>
> Dear Experts,
>
> I've created some topography maps in SPM EEG, but I'd like to know if there's a way to smooth these images (for display purposes only).
>
> Please could you let me know if there is a simple way of doing this?
>
> Thanks and Best Wishes,
> Gemma.
>
