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A possible ascending pathway from SC to visual cortex through the pulvinar nuclei (pulvinar) may be responsible for the effect of SC activity on visual processing in the cortex.

There may be an indirect ascending pathway from intermediate SC to the thalamic reticular nucleus.

Activity of the SC affects activity in cortical regions.

Anastasio and Patton present a model of multi-sensory integration in the superior colliculus which takes into account modulation by uni-sensory projections from cortical areas.

Anastasio and Patton's model is trained in two steps:

First, connections from primary input to deep SC neurons are adapted in a SOM-like fashion.

Then, connections from uni-sensory, parietal inputs are trained, following an anti-Hebbian regime.

The latter phase ensures the principles of modality-matching and cross-modality.

Modulatory input from uni-sensory, parietal regions to SC follows the principles of modality-matching and cross-modality:

A deep SC neuron (generally) only receives modulatory input related to some modality if it also receives primary input from that modality.

Modulatory input related to some modality only affects responses to primary input from the other modalities.

Deactivating regions in AES or lateral suprasylvian cortex responsive to some modality can completely eliminate responses of deep SC neurons to that modality.

Wallace and Stein argue that some deep SC neurons receive input from some modalities only via cortex.

The same regions in LGN receiving projections from the superficial SC project to the cortex.

The excitatory and inhibitory connections from the deep to the superficial SC and the connection from the superficial SC to LGN may be one route through which deep SC activity may reach cortex.

There are ascending pathways from SC to the eye fields through talamic structures.

There is a disynaptic connection from SC to the dorsal stream visual cortex, probably through the pulvinar.

Berman and Wurtz found neurons in the pulvinar nuclei which received input from SC and sent output to MT.