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. 2009 Jun 3;29(22):7199–7207. doi: 10.1523/JNEUROSCI.5387-08.2009

Figure 4.

Figure 4.

PPI analyses of valence-specific coupling with the PPA. a, c, The PPIs demonstrate that positive and negative states differentially modulated the covariance between the PPA and PVC bilaterally. Activation is superimposed on the template structural underlay (Colin27) (left: MNI sagittal x-coordinate = −15; axial z-coordinate = 3; right: x = 6; z = 15) b, d, In both PPI seeds, positive affect (blue) elicited a positive coupling between PPA and PVC (rleft = 0.32, rright = 0.69), whereas negative affect (red) elicited a negative coupling (rleft = −0.46, rright = −0.36). x-axes, Mean-corrected signal from the PPI term (the product of the respective PPA time series and condition regressors, averaged over 14 subjects). y-axes, Mean corrected signal from the respective PVC cluster maxima (first principal component of a 3 mm radius VOI, averaged over 14 subjects). The first two time points of each block were removed to account for the lag to peak BOLD response. L., Left; R., right.