A selective attention multi--chip system with dynamic synapses and spiking neurons

Selective attention is the strategy used by biological sensory systems to solve the problem of limited parallel processing capacity: salient subregions of the input stimuliare serially processed, while non-salient regions are suppressed. We present an mixed mode analog/digital Very Large Scale Integration implementation ofa building block for a multi-chip neuromorphic hardware model of selective attention. We describe the chip's architecture and its behavior, when its is part of a multi-chip system with a spiking retina as input, and show how it can be used to implement in real-time flexible models of bottom-up attention.