[MURG] Two preprints on spike timing-dependent synaptic plasticity (fwd from aburkitt@bionicear.org)

[Eugen Leitl]

----- Forwarded message from Anthony BURKITT <aburkitt at bionicear.org> -----

From: "Anthony BURKITT" <aburkitt at bionicear.org>
Date: Tue, 28 Oct 2003 16:17:11 +0100
To: <comp-neuro at neuroinf.org>
Subject: Two preprints on spike timing-dependent synaptic plasticity
Reply-To: "Anthony BURKITT" <aburkitt at bionicear.org>

Dear Colleagues,

Preprints of two papers on spike timing-dependent synaptic plasticity
are available:

"Spike timing-dependent plasticity: The relationship to rate-based learning 
for models with weight dynamics determined by a stable fixed-point", 
A.N. Burkitt, H. Meffin, and D.B. Grayden, to appear in Neural Computation, 
is available at
http://www.bionicear.org/people/burkitta/Burkitt_NC_2003.pdf

"How synapses in the auditory system wax and wane: Theoretical perspectives",
A.N. Burkitt and L.J. van Hemmen, to appear in Biological Cybernetics,
is available at
http://www.bionicear.org/people/burkitta/BurkittvH_BC_2003.pdf

Regards,

Tony Burkitt

===============================================
"Spike timing-dependent plasticity: The relationship to rate-based learning 
for models with weight dynamics determined by a stable fixed-point", 

A.N. Burkitt, H. Meffin, and D.B. Grayden, to appear in Neural Computation, 

Abstract:
---------
Experimental evidence indicates that synaptic modification depends upon 
the timing relationship between the presynaptic inputs and the output 
spikes that they generate.  In this paper results are presented for 
models of spike timing-dependent plasticity (STDP) whose weight dynamics 
is determined by a stable fixed-point.  Four classes of STDP are identified 
on the basis of the time-extent of their input-output interactions.  The 
effect upon the potentiation of synapses with different rates of input is 
investigated to elucidate the relationship of STDP with classical studies 
of LTP/LTD and rate-based Hebbian learning.  The selective potentiation of 
higher-rate synaptic inputs is found only for models where the time-extent 
of the input-output interactions are ``input restricted'' (i.e., restricted 
to time domains delimited by adjacent synaptic inputs) and that have a 
time-asymmetric learning window with a longer time constant for depression 
than for potentiation.  The analysis provides an account of learning dynamics 
determined by an input-selective stable fixed-point.  The effect of 
suppressive interspike interactions upon STDP are also analyzed and shown 
to modify the synaptic dynamics.

http://www.bionicear.org/people/burkitta/Burkitt_NC_2003.pdf

===============================================
"How synapses in the auditory system wax and wane: Theoretical perspectives",

A.N. Burkitt and L.J. van Hemmen, to appear in Biological Cybernetics,

Abstract:
---------
Spike timing-dependent synaptic plasticity has recently provided 
an account of both the acuity of sound localization and the 
development of temporal-fea\-ture maps in the avian auditory system.
The dynamics of the resulting learning equation, which describes 
the evolution of the synaptic weights, is governed by an unstable 
fixed-point.  We outline the derivation of the learning equation 
for both the Poisson neuron model and the leaky integrate-and-fire 
neuron with conductance syn\-ap\-ses.  The asymptotic solutions of 
the learning equation can be described by a spectral representation 
based on a biorthogonal expansion.

http://www.bionicear.org/people/burkitta/BurkittvH_BC_2003.pdf
====================ooOOOoo====================
Anthony N. Burkitt
The Bionic Ear Institute                 
384-388 Albert Street
East Melbourne, VIC 3002
Australia

Email:  aburkitt at bionicear.org 
http://www.bionicear.org/people/burkitta      
Phone: +61 - 3 - 9663 4453
Fax:   +61 - 3 - 9667 7518                                             
=====================ooOOOoo===================

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-- Eugen* Leitl <a href="http://leitl.org">leitl</a>
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