Figure 5. A graphical illustration of the plastic changes implied by the learning rules.

The graphs show the spike timings and, for one synapse, the dynamics of the synaptic current , the normalized PSP and the synaptic changes implied by the two learning rules. It is considered that one input spike arrives at this synapse at . The synaptic changes are shown to be localized temporally along the events that cause them; the actual application of the synaptic changes can be delayed with respect to these events. (A) One independent target spike and no actual spike. (B) A pair of matching target and actual spikes, the actual one following the target one. (C) One independent actual spike and no target spike. (D) A pair of matching target and actual spikes, the target one following the actual one.