Dear SPM experts,
Our EEG study involves a patient group and a control group.
We are conducting a source analysis on the 100-300 ms post-stimulus time window, and would like to use
the group inversion function of SPM, but are not sure of the implications of this on group comparison.
We assume we must invert both the patient and control group in the same inversion to be able to compare groups subsequently.
However, we expect there to be differences in activations between the groups.
Will inverting all participants together cause some loss of any group differences?
Are we correct in thinking that we cannot invert the two groups separately?
Many thanks for your help,
Jennifer Gethin
PhD Student
Neuroscience and Aphasia Research Unit
School of Psychological Sciences
Zochonis Building
University of Manchester
M13 9PL
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