Figure 4.

Dynamics of cells when α(τ) = 1. Top, The stimulus function f providing input to a set of cells is non-zero for two periods of time. Cells in F(s) respond to non-zero f and then decay exponentially after the input is turned off. Different cells respond with different decay constants s. Cells in f̃ do not respond to the stimulus immediately, but after some characteristic delay. Different cells have different delays determined by their value of τ*. The spread of the firing of each cell in f̃(τ*) depends on its value of τ*. The value of τ* for a cell in f̃ is determined by the value of s of the cells in F(s) that project to it. Note also that the activity of cells in f̃ show an asymmetric profile in time.