Figure 4. Surround stimulation in general reduces excitation and inhibition/disinhibition for all cell types.

A, relationship between the magnitude of excitatory inputs elicited by spots of optimal and large size. B, relationship between the magnitude of inhibitory inputs elicited by spots of optimal and large size. The magnitude of excitatory and inhibitory synaptic inputs is expressed as the integral of their conductance and is represented by the symbols; the dashed line represents the line of unity.