OK, you probably read the data correctly. Could you show us what your
design matrix look like? To explore a bit further, you can also use the
"plot" button with the "contrast estimates" and "fitted responses" options.
On 03/04/17 16:20, Alina D wrote:
> Thank you very much for replying. I did Extract data > betas > this
> voxel and the only thing that happens is that matlab returns this :
> beta =
> Before I tried to load the beta_0001.nii file and to get the intensitied
> of some voxels from there.
> Qse = 'beta_0001.nii';
> Wse = spm_vol(Qse);
> Bse = spm_read_vols(Wse);
> I stored the coordinates of the voxels in a matrix of the form:
> myindex3d = zeros(length(myindex),3)
> And then looped through the total number and ploted it :
> scatter_data(ii) = Bse(myindex3d(ii,1),myindex3d(ii,2),myindex3d(ii,3))
> What would you suggest?
> Best wishes,
> On Mon, Apr 3, 2017 at 5:05 PM, Guillaume Flandin <[log in to unmask]
> <mailto:[log in to unmask]>> wrote:
> Dear Alina,
> How did you extract the data for a given voxel? What is displayed if,
> when looking at results, you move the 'current voxel' (red arrow) to
> your voxel of interest and do a right click while on the glass brain and
> select Extract data > betas > this voxel in the contextual menu that
> Best regards,
> On 03/04/17 12:51, Alina Dinu wrote:
> > Dear all,
> > I am interested in the beta values for certain activated voxels.I
> extracted them from the beta_0001 file. I have a couple of questions:
> > 1. Could someone please tell me if this is this the correct file?
> (given that I have a block design with only one condition)
> > 2. After I plot them I notice that the values are too high (in the
> order of 80-100) which is nonsensical for beta values. Could someone
> please tell me if there is any kind of scalling done in this file?
> How are these values coded?
> > 3. Could someone please tell me if this file also includes the
> confound mean predictor?
> > Kind regards,
> > Alina
> Guillaume Flandin, PhD
> Wellcome Trust Centre for Neuroimaging
> University College London
> 12 Queen Square
> London WC1N 3BG
Guillaume Flandin, PhD
Wellcome Trust Centre for Neuroimaging
University College London
12 Queen Square
London WC1N 3BG