[Eeglablist] FMRIB Plugin 1.21 question about section/Volume markers and possible bug?

[Johan]

Deal all,

My first question is regarding the volume correction for the
fmrib_fastr toolbox for eeg signals. I was wondering how many eeg data
points go into the volume template used for correction: is it a short
period around the volume artefact, or rather all of the data points
inside the time period of one complete volume?

Also I think I have found a possible bug (or an error in the way I use
the fmrib_fastr toolbox):

After removing the slice-artifacts with, I do an extra run of the
toolbox to also remove the volume-artifacts. But when I do this, (10
averages with OBS on 'auto' and no ANC), I get an error message, at
the line where this is written in fmrib_fastr.m:
 [apc,ascore,asvar]=pca_calc(pcamat(1:pccount,:)');
It seems that pccount = size(pca_calc)+1... in other words matlab
tries to get parts of the matrix pca_calc from 1 to 31, while it only
has 30 columns, and therefore procudes an error.

Has anyone experienced something similar?

Thanks!!

Johan
PhD Stud. Movement Disorders, AMC, Amsterdam





On Wed, Apr 26, 2006 at 7:29 PM, Rami Niazy <rami at fmrib.ox.ac.uk> wrote:
> Hi,
>
> For those interested, a new version of the FMRIB plug-in for the removal of
> fMRI artifacts from EEG data is now available.  This release fixes 2
> potentially serious bugs:
>
> 1) In some cases the removal of residual fMRI artifacts using basis sets
> overfits and removes data leaving only meaning-less noise.  This has now
> been fixed by restricting the frequencies as which this stage operates.
> 2) A typo, which could have potentially affected some command line usage of
> the (FASTR) plug-in, has also been fixed.
>
> You can get the plug-in from http://www.fmrib.ox.ac.uk/~rami/fmribplugin/
>
> As always, let me know of any bugs and performance issues.
>
> Regards,
>
> Rami
>
> ________________________________________________________
> Rami K. Niazy
> DPhil Candidate
> University of Oxford, Centre for Functional MRI of the Brain (FMRIB)
> John Radcliffe Hospital, Headington, Oxford OX3 9DU, United Kingdom
> Tel:    +44 (0) 1865 222739   /  Fax:  +44 (0) 1865 222717
> e-mail: rami at fmrib.ox.ac.uk  /  URL:  http://www.fmrib.ox.ac.uk/~rami
>
>
>
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