Figure 3.

Illustrations of five general linear models (GLMs) for different psychophysiological interaction analysis. Red blocks represent the variables that are kept the same in all the five GLMs. They include a psychological variable of a (non‐centered) box‐car function convolved with hemodynamic response function (HRF), a physiological variable, covariates including white matter/cerebrospinal fluid signals and head motion models, and a constant term. The five models only differ in the blue blocks. [Color figure can be viewed at http://wileyonlinelibrary.com]