University of Delaware Neuromorphic Systems Laboratory

TEMPORAL PROCESSING IN ARTIFICIAL DENDRITIC TREE NEUROMORPHS

David P. M. Northmore and John G. Elias
University of Delaware
Newark, DE 19716

ABSTRACT

The artificial dendritic tree, as part of a silicon neuromorph, is modelled as a multibranched, passive cable structure. Synaptic activations are either depolarizing (excitatory), hyperpolarizing (inhibitory), or shunting. Contemporaneous synaptic activation at widely separated sites on the tree result in linear summation of their effects, as do neighboring excitatory and inhibitory activations; activation of synapses of the same type close in time or space produce local saturation of potential resulting in sublinear summation. Linear summation and saturation, both physiologically plausible, are exploited to allow a single neuromorph to discriminate pulse intervals, pulse frequencies, or detect correlation between input trains.

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