Large developing receptive fields using a distributed and locally reprogrammable address-event receiver.
A distributed and locally reprogrammable address-event receiver has been designed, in which incoming address-events are monitored simultaneously by all synapses, allowing for arbitrarily large axonal fan-out without reducing channel capacity. Synapses can change the address of their presynaptic neuron, allowing the distributed implementation of a biologically realistic learning rule, with both synapse formation and elimination (synaptic rewiring). Probabilistic synapse formation leads to topographic map development, made possible by a cross-chip current-mode calculation of Euclidean distance. As well as synaptic plasticity in rewiring, synapses change weights using a competitive Hebbian learning rule (spike-timing-dependent plasticity). The weight plasticity allows receptive fields to be modified based on spatio-temporal correlations in the inputs, and the rewiring plasticity allows these modifications to become embedded in the network topology.
Bamford
Simeon A
SA
Institute of Integrated Micro and Nano Systems, Neuroinformatics Doctoral Training Centre, University of Edinburgh, Edinburgh, UK. simeon.bamford@iss.infn.it
Murray
Alan F
AF
Willshaw
David J
DJ
D000200:Action Potentials; D000465:Algorithms; D001369:Axons; D003201:Computers; D006801:Humans; D007858:Learning; D008568:Memory; D016571:Neural Networks, Computer; D009473:Neuronal Plasticity; D016011:Normal Distribution; D017729:Presynaptic Terminals; D011336:Probability; D013569:Synapses; D013997:Time Factors