Figure 2. Network response to unimodal stimulation and to cross-modal spatially coincident audio-visual stimulation.

(A) A unimodal stimulation was applied to the network and maintained constant throughout the entire simulation. Neural activity is shown in the new steady-state reached by the network. Left panels - Neuron activity in the auditory and visual areas in response to an auditory stimulus of amplitude  = 15 applied at position p^a = 120°. No activity is elicited in the visual area. Right panels - Neuron activity in the auditory and visual areas in response to a visual stimulus of amplitude  = 15 applied at position p^v = 120°. No significant activity is elicited in the auditory area. (B) An auditory stimulus and a visual stimulus are simultaneously applied at the same spatial position (p^a = p^v = 120°) and maintained constant throughout the simulation. Network response is shown in steady-state condition. Auditory and visual stimuli have the same strength ( =  = 15). Strong reinforcement and narrowing of auditory activation occurs (compare with Fig. 2A, left panels).