Dear All,
I am trying to learn more about PPI and its capabilities. Specifically, all studies I have read that use PPI analysis have had only two task conditions. In the PPi.psychological column, the vector is the canonical model convolved with 1 for the first task type and -1 for the second task type. The interaction PPI.ppi becomes easily explainable and also has a directionality. However, I am not seeing how this concept can be expanded to 3 or more tasks. Or what the interpretation of the interaction term would be in the case of three or more taks types.
Is there anyway to conduct PPI on three tasks using the traditional three column approach (e.g. what value do you use for the third task in the deconvolution)? Or does the interaction have to be computed in a pairwise manner for each possible combination of tasks?
Additionally, in the case where individuals have a non-canonical response or where the response varies by inidividual, what should be done for the convolution?
Any thoughts would be greatly appreciated.
Best Regards, Donald McLaren
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D.G. McLaren
University of Wisconsin - Madison
Neuroscience Training Program
Tel: (773) 406 2464
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