, 1997; Gitelman, Penny, Ashburner, & Friston, 2003) analyses as implemented in SPM 8. PPI detects regionally specific responses in terms of an interaction of a seed-region (extracted mean time-series of a functionally or anatomically defined region of interest (ROI)) with an experimental factor, using the difference in regression coefficients. Because interactions in the brain do not occur on a h


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