FIGURE 2.

(A) The weight update (dW) is plotted as a function of the membrane potential of pre-synaptic neuron, with the color code representing the initial weight. (B) The dW is linearly dependent on (1-W) for potentiation and on (W) for depression. The learning rate is set to 0.001 in both (A,B). (C–E) A pair of pre-synaptic neuron and post-synaptic neuron is simulated along with their synaptic weight evolution. The weight update occurs at every post-synaptic neuron spike event and is negative if the pre-synaptic neuron membrane potential is greater than zero (shown in red dotted lines). The weight update is positive (green dotted lines) if the pre-synaptic neuron voltage is lesser than zero.