1. A cortical neuromorphic network comprising: a neuromorphic node comprising a spike timing dependent plasticity (STDP) synapse and a neuromorphic neuron, the neuromorphic node being a node of a plurality of neuromorphic nodes arranged as a network layer to receive a feedforward spike signal from selected ones of a plurality of input neurons of an input layer and to provide a neuromorphic node output spike signal as a recurrent spike signal to the neuromorphic nodes of the network layer, wherein a combination of the recurrent spike signals from the neuromorphic nodes of the network layer and the feedforward spike signals received from the selected ones of the input layer input neurons is an excitatory spike signal to the neuromorphic node.