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Proceedings Paper

LANN27: an electronic implementation of an analog attractor neural network with stochastic learning
Author(s): Davide Badoni; Stefano Bertazzoni; Stefano Buglioni; Gaetano Salina; Stefano Fusi; Daniel J. Amit
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Paper Abstract

We describe and discuss an electronic implementation of an attractor neural network with plastic synapses. The synaptic dynamics are unsupervised and autonomous, in that they are driven exclusively and perpetually by neural activities. The latter follow the network activity via the developing synapses and the influence of external stimuli. Such a network self- organizes and is a device which converts the gross statistical characteristics of the stimulus input stream into a set of attractors (reverberations). To maintain for a long time the acquired memory the analog synaptic efficacies are discretized by a stochastic refresh mechanism. The discretized synaptic memory has indefinitely long life time in the absence of activity in the network. It is modified only by the arrival of new stimuli. The stochastic refresh mechanism produces transitions at low probability which ensures that transient stimuli do not create significant modifications and that the system has large palimpsestic memory. The electronic implementation is completely analog, stochastic and asynchronous. The circuitry of the first prototype is discussed in some detail as well as the tests performed on it. In carrying out the implementation we have been guided by biological considerations and by electronic constraints.

Paper Details

Date Published: 6 April 1995
PDF: 12 pages
Proc. SPIE 2492, Applications and Science of Artificial Neural Networks, (6 April 1995); doi: 10.1117/12.205117
Show Author Affiliations
Davide Badoni, Univ. di Roma Tor Vergata (Italy)
Stefano Bertazzoni, Univ. di Roma Tor Vergata (Italy)
Stefano Buglioni, Univ. di Roma Tor Vergata (Italy)
Gaetano Salina, Univ. di Roma Tor Vergata (Italy)
Stefano Fusi, INFN-Istituto Nazionale di Fisica Nucleare (Italy)
Daniel J. Amit, Racah Institute of Physics (Israel) and Univ. di Roma La Sapienza (Italy)

Published in SPIE Proceedings Vol. 2492:
Applications and Science of Artificial Neural Networks
Steven K. Rogers; Dennis W. Ruck, Editor(s)

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