1. A simulated nervous system network method operating on one or more microprocessors, comprising: a plurality of neurons; a plurality of synapses interconnecting the plurality of neurons; wherein the neurons are configured to fire in a firing pattern that activates a synaptic pathway including one or more synapses of the plurality of synapses; wherein the plurality of synapses have spike-timing dependent plasticity (STDP); wherein the network is configured to provide extracellular dopamine to the synaptic pathway during a window of time between the firing of the neurons and a decay of an eligibility trace (c) to zero to thereby strengthen the one or more synapses along the synaptic pathway.