Responses in a simulated immature SC neuron to different spatial configurations of modality-specific (only visual, panel a, only auditory, panel b) and cross-modal stimuli (panel c). Note the huge receptive fields (especially the auditory and the cross-modal) of an actual immature SC neuron. In panel c the neuron is incapable of integrating their two cross-modal inputs, responds to stimuli presented in a very huge portion of the space, and have responses equivalent to those of the stronger of the two, independently to their relative spatial configurations.