Dear SPMers,
I would like to extract effect sizes for functional ROIs across multiple subjects for an event-related design, using MarsBar. The way I understand this is done in MarsBar is the following:
1) Extract ROI data (Select ROI and SPM file)
2) SPM graphics window will open an input summary
3) Save the data to a file
4) In MatLab, open the saved file in workspace, open Y matrix.
If I understand correctly, the Y matrix is a table of effect sizes for each of my subjects for the selected ROI. Is this correct or are the values in the Y matrix percent signal change?
Additionally, what values compose the Y var matrix?
Any help will be greatly appreciated.
Best,
Elsa Baena
Elsa Baena
Graduate Student
Clinical Neuropsychology Program
Cognitive Neuroscience Laboratory
University of Arizona
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