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: gr...@nmr.mgh.harvard.edu
To: freesurfer@nmr.mgh.harvard.edu
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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