The time courses are independent of the contrasts. The time course values are the MR units globally scaled to a grand mean of 1000, so you can think of the units as 10ths of percent. I think you can configure the time course to show vertex-by-vertex percentages.

doug

Dave Brohawn wrote:

Hello,

I am not sure what y-axis values are in a time course plot.

Here is my bugr information:

FREESURFER_HOME: /usr/local/freesurfer/stable4

Build stamp: freesurfer-Linux-centos4-stable-v4.2.0d-20090227

RedHat release: CentOS release 5.2 (Final)

Kernel info: Linux 2.6.18-92.el5 i686

NMR Center info (/space/freesurfer exists):

machine: seymour

SUBJECTS_DIR: /autofs/space/ventzl_016/users/

PWD: /autofs/space/ventzl_016/users

I entered

tksurfer fsaverage lh inflated

When it came up, I loaded this time course data for a group of 8 subjects:

/autofs/space/ventzl_016/users/CC-n8/newEMerror-tpx/lh.h.nii

I then plugged in a vertex of interest (124608) and the time course plot came up. It is correct is showing the me the time course for 4 different contrasts included in this analysis, though I am not sure what the y-axis is.

Its values are incremented by whole 1's (1 2 3). We are looking for percent signal change values. Can you tell me what these y-axis values are, and if there is a way to calculate percent signal change from them if I write these time course values to file?

Thank you very much,

Dave Brohawn

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