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You'll need to use PPI as you need the connectivity during the task component, not the correlation across the entire time series that includes task and non-task intervals.

Best Regards, Donald McLaren
=================
D.G. McLaren, Ph.D.
Research Fellow, Department of Neurology, Massachusetts General Hospital and
Harvard Medical School
Postdoctoral Research Fellow, GRECC, Bedford VA
Website: http://www.martinos.org/~mclaren
Office: (773) 406-2464
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On Mon, Jan 6, 2014 at 2:56 AM, Mark <[log in to unmask]> wrote:
Hi,

I have 20 subjects and am interested in the interaction of 2 regions of interest (A and B). I can extract eigenvariate time series in the 2 regions for each subject, but how can I analyze to show that the time series of the 2 regions covary with each other? I can calculate 20 correlation coefficients in total but I don't know how can I say that the 2 regions synchronize during the task. I know PPI can solve this problem but I'm just interested in these 2 regions. Hope someone can  help. Thanks in advance.