Hi,
I think I'm a little way through understanding the GLM in SPM...
Now there is only one thing about the regressors which I don't get: In
"Explore Design" I get a graph depicting the regressors for the given
conditions. For block designs the scale is usually between -1 and 1,
giving 1 for scans that are definitely inside the condition and -1 for
scans outside the condition (right?).
For an event-related design, however, the amplitudes are much larger, in
my case it's -3 to 4.
Can anybody please explain to me how SPM gets these values and how they
are to be interpreted?
Thanks
Karen
--
++++++++++++++++++++++++++++++++++++++++++++++
Karen Lidzba
[log in to unmask]
(+49)7071-2981320
Department of Developmental Neurology
University Children's Hospital
Hoppe-Seyler-Str. 1, 72076 Tuebingen, Germany
++++++++++++++++++++++++++++++++++++++++++++++
|