Figure 2.

A graphical representation of the comparison of two models. In this example the correlation between IED and fMRI signals without (frac${}_{\text{stan}}^{\text{IED}}$) and with VIPH (frac${}_{\text{VIPH}}^{\text{IED}}$) correction is schematically shown. (a) shows the definitions of the areas which were calculated. (b) shows the situation in which the model with VIPH correction is a subset of the model without VIPH correction. (c) shows the reverse situation in which the model without VIPH correction is a subset of the model with VIPH correction.