Departmental Papers (ESE)
Abstract
A theory of temporally asymmetric Hebb rules, which depress or potentiate synapses depending upon whether the postsynaptic cell fires before or after the presynaptic one, is presented. Using the Fokker-Planck formalism, we show that the equilibrium synaptic distribution induced by such rules is highly sensitive to the manner in which bounds on the allowed range of synaptic values are imposed. In a biologically plausible multiplicative model, the synapses in asynchronous networks reach a distribution that is invariant to the firing rates of either the presynaptic or postsynaptic cells. When these cells are temporally correlated, the synaptic strength varies smoothly with the degree and phase of their synchrony.
Document Type
Journal Article
Subject Area
GRASP
Date of this Version
January 2001
Date Posted: 04 August 2005
This document has been peer reviewed.
Comments
Copyright American Physical Society. Reprinted from Physical Review Letters, Volume 86, Issue 2, January 2001, 4 pages.
Publisher URL: http://dx.doi.org/10.1103/PhysRevLett.86.364
NOTE: At the time of publication, author Daniel D. Lee was affiliated with Bell Laboratories. Currently (August 2005), he is a faculty member in the Department of Electrical and Systems Engineering at the University of Pennsylvania.