[Homer-users] Data export / GLM analysis?

[Sabrina Brigadoi]

Hi Katarina,

hmrDeconvHRF_DriftSS  is the function that does the GLM in Homer2.

Concering the other questions:

- procReesult.dc contains the whole dc data (3259 will be your total number
of samples, 3 are HbO, HbR and HbT and 40 are your channels). If you want
to look at the mean HRF for every channel you have to look at
procResult.dcAvg (n of samples of your trial x 3 (HbO, HbR, HbT) x n of
channels x number of stimuli).

- 508 should be the number of samples of your trial. Did you set the
sampling frequency correctly in the .nirs file?

Sabrina


2014-08-04 14:30 GMT+01:00 katarina begus <katarina.begus at gmail.com>:

> Dear Homer2 users,
>
> I was wondering if you could help us out with some questions we have about
> using the data processed with Homer2, please?
>
> We've been running GLM analysis on our data using a combination of custom
> Matlab scripts and the SPM-NIRS toolbox so far, but would now like to start
> using Homer2. Are there any scripts available that would do GLM on data
> preprocessed in Homer2?
>
> If not, we were thinking of extracting the data after processing and
> re-converting it to the format that could be used with our current scripts.
> But looking into that, we got stuck on how the processed data is organised.
> We have 4 conditions, 40 channels, and each trial lasts 24s = 240 samples.
> The numbers we get in the procResult files don't really make sense
> according to that:
>
> - In the .nirs files, procResult.dc has a structure of (3259 x 3 x 40). I
> assume 3 = HbO-HHb-T and 40 = channels. But what would 3259 be and how are
> the different conditions coded in this file?
>
> - In the groupResults.mat, the group.subjs(1,1).procResult.dcAvg has a
> structure of (508 x 3 x 40 x 4). Again, I assume 3 = HbO-HHb-T; 40 =
> channels; 4 = conditions. But what is 508? In the processing stream we
> specified to block average from -5 to 30s around the event, but that would
> make 350 samples, not 508?
>
> We would really appreciate if anyone could help!
>
> Many thanks,
> Katarina
>
> --
>
> Katarina Begus
> PhD Student, Research Assistant
> Centre for Brain and Cognitive Development
> Birkbeck, University of London
> Office Tel: +44(0) 20 7079 0766
> Website: http://www.cbcd.bbk.ac.uk/people/students/katarina_begus
>
>
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-- 
Sabrina Brigadoi
sabrina.brigadoi at gmail.com
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