paper available: synapse efficiency diverges due to pruning

[Kazushi Mimura]

Apologies for multiple postings.


Dear, colleagues.


I would like to announce the following paper available on the web site:
http://www.kobe-kosen.ac.jp/~mimura/paper/pre2003.pdf
( or cond-mat/0207545 http://arxiv.org/abs/cond-mat/0207545 )

'Synapse efficiency diverges due to synaptic pruning following over-growth.'
by Mimura,K., Kimoto,T. & Okada,M.
Physical Review E (in press). 


Abstract--------------------------------------------------------
In the development of the brain, it is known that synapses are pruned 
following over-growth. This pruning following over-growth seems to be 
a universal phenomenon that occurs in almost all areas -- visual cortex, 
motor area, association area, and so on. It has been shown numerically 
that the synapse efficiency is increased by systematic deletion. We 
discuss the synapse efficiency to evaluate the effect of pruning 
following over-growth, and analytically show that the synapse efficiency 
diverges as O(log c) at the limit where connecting rate c is extremely small. 
Under a fixed synapse number criterion, the optimal connecting rate, 
which maximize memory performance, exists. 
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Sincerely Yours,

Kazushi Mimura
Dept. of Electrical Engineering, Kobe City College of Technology
phone: +81-78-795-3236 (direct line) 
fax: +81-78-795-3314
e-mail: mimura at kobe-kosen.ac.jp
url: http://www.kobe-kosen.ac.jp/~mimura/

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Kazushi Mimura, Kobe-cct +81-78-795-3236 (direct)