Large developing receptive fields using a distributed and locally reprogrammable address-event receiver

Authors:
Simeon A. Bamford;Alan F. Murray;David J. Willshaw
Affiliations:
Istituto Superiore di Sanità, Italy and Inst. of Int. Micro and Nano Systems, Neuroinf. Doctoral Training Centre, Univ. of Edinburgh, UK and Lab. for Synthetic, Perceptive, Emotive and Cognit ...;Institute of Integrated Micro and Nano Systems, Neuroinformatics Doctoral Training Centre, University of Edinburgh, Edinburgh, UK;Institute of Integrated Micro and Nano Systems, Neuroinformatics Doctoral Training Centre, University of Edinburgh, Edinburgh, UK
Venue:
IEEE Transactions on Neural Networks
Year:
2010

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Abstract

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.