Figure 9.

Dynamics of a threshold latch in response to three different signal strengths, with non-zero noise. Blue: strong signal; green: medium signal; red: weak signal. (A) Input-output evolution of the threshold-unit’s dynamics, starting at the origin and moving rightward, and upward along the bottom branch of the folded, effective activation function. Note the failure of the system’s output value to exceed 0.4 before the shutoff inhibition drives the system down and to the left well before the system’s output reaches its stable attracting value just below 1. (B) Stimulus-locked averages of activation (dashed: accumulator; solid: threshold-unit). (C) Response-locked averages of the threshold-unit activations, showing a common final level of activation, but differences in buildup rate for different signal qualities defining the gray area in the magnified inset (compare to Figures 7 and 8).