[Homer-users] SD geometry warning and baseline removal

[Tempest.GAVIN at unice.fr]

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