If you just want to exclude those time points then you can use a time
point exclude file. To do this, create a text file with the time in
seconds of the time points you want to exclude (t=0 is first time
point), put this file in the run folder (where the raw data is) then
when making the analysis, specify -tpexclude filename. If you want to
create a nuisance regressor, then create a text file with a value for
each time point and put it in the run folder then run mkanalysis-sess
with -nuisreg filename 1
doug
On 5/3/15 11:17 AM, Xiaomin Yue wrote:
Hi Doug,
Thanks for your response. I want to treat it as a nuisance variable.
If so, should the #3 is best choice?
Xiaomin
------------------------------------------------------------------------
Date: Sun, 3 May 2015 11:06:01 -0400
From: [email protected]
To: [email protected]
Subject: Re: [Freesurfer] a mkanalysis-sess question
#1 and #3 are basically the same. If used as a task regressor, then a
contrast for it will be created. #2 is a parametric modulation.
Probably not what you want but see
http://freesurfer.net/fswiki/FsFastParametricModulation
Do you want to treat it as a nuisance variable or task? In any event,
I would probably recode it to make fixation=0 and non-fixation
something else
On 5/2/15 5:34 PM, Xiaomin Yue wrote:
Hi,
I have a question related to how to make an appropriate design
matrix using fs-fast 5.3. Subjects’ eye movement was collected
during an experiment. Then, the data has been transformed to a
continuous variable with a number for each TR. The better
fixation performance has higher number. For example, a number
would be 0 if subjects look away from a target within a TR. In
ideal situation, subjects should keep his eyes on target all the
time, so the variable should be 1 for all TR. According to
mkanalysis-sess documents, it seems that there are three different
ways to take into account of eye fixation performance: 1) use it
as an external task regressor; 2) use it as a weight in the
paradigm file (the fourth column); 3) use it as a nuisance
regressor. My question is what’s the difference between the three
methods? In my situation, which one is the best choice in my
situation?
I hope the question is clear. Thanks so much for your help.
Xiaomin
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