V4_HMax   This model captures some aspects of the tuning of V4 neurons to boundary curvature. It is very similar to that proposed by Cadieu et al. (2007) to explain the responses of V4 neurons to simple closed shape stimuli (Pasupathy and Connor, 2001). The architecture of the model is a refinement of the hierarchical alternation between simple (S) and complex (C) cell layers described by Riesenhuber and Poggio (1999). This is a strictly feedforward model, and it has no temporal processing. Thus, a single response values is associated with a given input image.