Figure 3.

How lateral inhibition causes a peak in firing after the stimulus. Top, f(τ) is non-zero at one point in time. Middle, Time course of F(s, τ) for several values of s. Each of the black lines gives F(s, τ) for a particular value of s; the gray lines give F(s, τ) for a nearby value of s. Note that the difference between each black line and its accompanying gray lines is zero immediately after the stimulus but also zero for very long times. The difference is maximal at an intermediate time that depends on the value of s. Bottom, The magnitude of the difference between pairs of adjacent values of F(s, τ) is shown, i.e., the distance between each pair of lines. This difference is proportional to the derivative with respect to s. Note that the difference peaks after the stimulus; the time of the peak depends on the value of s.