Dear Friend:
I'm wondering if my following understanding of mean image is correct.
Assume I have two subjects. There are A, B, C three points in the brain. B
is between A and C. If one subject show activation in A and deactivation in
C, while the other subject shows activation in C and deactivation. The mean
image of the two subjects may show neither activation nor deactivation.
If one subject show highest activation in A, less activation in B, and no
activation in C, and the other subject show highest activation in C, less
activation in B, and no activation in A. The mean image may show activation
in B but not in A and C.
Any comments are appreciated
Jiansong
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