Figure 3.

Performance-based modeling block diagram. The optimal spatial model is determined by minimizing the output error of the classifier. An ordinary least-squares regression is used to solve for the spatial weights in the linear system created by the cascade of the spatial model with the fixed sERP-derived linear classifier. *This is a conceptual representation and the modeled sERPs may not be explicit representations of the archetype sERPs. However, the resulting spatial model structure is equivalent that of the direct modeling.