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help > task time course not mean-centered
Oct 24, 2014 04:10 AM | Joe Cheng - the University of Hong Kong
task time course not mean-centered
Dear all,
I'm new to PPI or gPPI and I have this question: is the task time course not mean-centered? If so, why?
I'm asking because I'm only looking at changes in functional connectivity during the condition and rest, or during 'on' and 'off'. It makes sense to mean-centered the task time course, so that PPI regressor will be correlated with seed during 'on', but anti-correlated during 'off' (the message in figure 2 in 'Tools of the trade: psychophysiological interactions and functional connectivity' by Dr. JX O'Reilly). Thanks a lot!
I'm new to PPI or gPPI and I have this question: is the task time course not mean-centered? If so, why?
I'm asking because I'm only looking at changes in functional connectivity during the condition and rest, or during 'on' and 'off'. It makes sense to mean-centered the task time course, so that PPI regressor will be correlated with seed during 'on', but anti-correlated during 'off' (the message in figure 2 in 'Tools of the trade: psychophysiological interactions and functional connectivity' by Dr. JX O'Reilly). Thanks a lot!
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Title | Author | Date |
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Joe Cheng | Oct 24, 2014 | |
Donald McLaren | Oct 24, 2014 | |