Before revision: There is evidence that the primary visual cortex (V1) creates a bottom-up saliency map to guide attention exogenously, and this V1 saliency map is read out by the superior colliculus which receives monosynaptic inputs from V1.
After revision: for the V1 Saliency HypothesisThere is evidence that the primary visual cortex (V1) creates a bottom-up saliency map to guide attention exogenously, and this V1 saliency map is read out by the superior colliculus which receives monosynaptic inputs from V1.