Hey everyone,
I'm a bit confused about how to threshold my T-Maps in caret5. I created
the maps with the following command:
/usr/local/caret/bin_linux/caret_command
-metric-statistics-one-sample-t-test $EACHMETRIC $FIDUCIAL_COORD
$OPEN_TOPO $SURFACE_SHAPE 3 T-Map_$EACHMETRIC -300000.0 2.5 0.10 10 1 1000
0 4
So I put the negative threshold to -300000 and the positive threshold to
2.5. When I look at the resulting Tmap.metric files it gives me something
like this:
Filename: T-Map_LH_cCue_Endo.metric_TMap.metric
Number of Nodes: 73730
Number of Columns: 1
Column Minimum Maximum Mean Sample Dev %
Positive % Negative Column Name
1 -9.785 6.076 -0.950 2.639
36.234 63.766 T-Values
As far as I understand, this means the maximum negative T value in this
metric is -9.785 and the maximum positive T value is 6.076. When I open
the file in caret though (Color mapping: Auto Scale, Display mode: Both,
Display Color Bar, Threshold Adjustment:Column: permuted
T-Values,Threshold type: Column) the bar tells me that my maximum negative
value is -3.7 and my maximum positive value is 2.6. This also holds when I
adjust the thresholds in the fields below to -2 and 2, when almost all
activation disappears.
Which is the correct information?
Thanks a lot for your help!
Julia
Dipl. Psych. Julia Bender
Humboldt Universität zu Berlin
Mathematisch - Naturwissenschaftliche Fakultät II
Institut für Psychologie, Abt. Klinische Psychologie
Unter den Linden 6
D-10099 Berlin
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