Hypothetical models for visuospatial attention processing. DCM was applied to compare two models of visuospatial attention processing. a, Selective contralateral input (i.e., RVF input to the left IPS and LVF input to the right IPS). b, Bihemifield representation in the right IPS (i.e., RVF input to both left and right IPS and LVF input to the right IPS). Both models hypothesized bidirectional intrinsic connections between the right and the left IPS.