Tinnitus Abnormal Brain Region Detection Based on Dynamic Causal Modeling and Exponential Ranking

Figure 4

Illustration of a brain described by 2 sources, A and B, respectively. Inputs , defined as a function of time , are added to the brain system. The perturbation of the inputs at each source is described as a differential equations , where is the input and are the source parameters that vary along with experimental settings. How a source will be measured in the sensors is then described by the lead-field function [8].