[Homer-users] SD geometry warning and baseline removal

[Helga Miguel]

Hi Gavin,

Regarding your questions, I also have the same problem when loading the
files into Homer. And I always use the same .SD file.

About the baseline, as far as I know, you can remove it in the STIMGUI.
Katherine Perdue answered an email to this mailing list sometime ago with
the exact steps, see if you find it. I do not think Homer2 accounts for
baseline by itself. In my experiment I am giving a trigger in the beggining
of each acquisition to mark the baseline, before I have the following
triggers.

I hope I had helped somehow.

Thanks,
Helga

On Thu, Mar 10, 2016 at 4:23 PM, <Tempest.GAVIN at unice.fr> wrote:

> Dear HomER users,
> I have found the forum a very helpful source of information and I have a
> couple of questions of my own about data analysis.
> Briefly; I have data converted from Oxysoft (.oxy) to .nirs files. Data
> were collected during 60min cycling exercise from two 1x4 squares with a
> SD distance of either 3 or 4cm. I am using HomER to process the data
> (filter, remove and correct artefacts etc.) before export.
> 1.      When I load the files into HomER, I receive the following error:
> ‘WARNING: More than One SD geometry found. Might cause errors’. What is
> the reason for this and how should it be fixed?
> 2.      I am not using stimuli markers or block averaging sections of the
> data; however the first two minutes of each dataset are ‘resting’
> measures (baseline).  I would like to remove the baseline data from the
> subsequent signal or to use these data as a reference; perhaps
> incorporating these data would influence the motion correction functions
> (?) Does HomER include a function to account for an initial baseline
> during the processing stages?
> Any help is much appreciated,
> Gavin
>
> Research Fellow
> Laboratory LAMHESS
> University of Nice, France
>
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-- 
Helga Miguel, MS, OT
Ph.D student in Basic Psychology
Neuropsychophysiology Lab
University of Minho
Braga, Portugal
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