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Rădulescu, Anca; Cox, Kingsley; Adams, Paul Recent work on long term potentiation in brain slices shows that Hebb's rule is not completely synapse-specific, probably due to intersynapse diffusion 3 baari kauplemise strateegia calcium or other factors.
We previously suggested that such errors in Hebbian learning might be analogous to mutations in evolution. We examine this proposal quantitatively, extending the classical Oja unsupervised model of learning by a single linear neuron to include Hebbian inspecificity.
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We introduce an error matrix E, which expresses possible crosstalk between updating at different connections. When there is no inspecificity, this gives the classical result of convergence to the first principal component of the input distribution PC1.
We show the modified algorithm converges to the leading eigenvector of the matrix EC, where C is the input covariance matrix.
We study the dependence of the learning accuracy on b, n and the amount of input activity or correlation analytically and computationally. We find that accuracy increases learning becomes gradually less useful with increases in b, particularly for intermediate i.
We discuss the relation of our results to Hebbian unsupervised learning in the brain. When the mechanism lacks specificity, the network fails to learn the expected, and typically most useful, result, especially when the input correlation is weak.
Hebbian crosstalk would reflect the very high density of synapses along dendrites, and inevitably degrades learning.
Lanzerotti has been named editor of a new AGU online publication devoted to the emerging field of near-Earth space conditions and their effects on technical systems. Space Weather: The International Journal of Research and Applications, will be the first journal dedicated solely to the subject, and will include peer-reviewed research, as well as news, features, and opinion articles.
A quarterly magazine digest will also be published from the online edition and distributed free of charge to space weather professionals.
Ettevalmistatud märkused: Operaator Tere hommikust, pärastlõunal, õhtul ja teretulnud Minu nimi on Brian ja ma olen täna teie konverentsi moderaator. Praegu on kõik osalejad ainult kuulamisrežiimis.
He also serves on the governing board of the American Institute of Physics. He HP Share Option Tehingud author or co-author of more than publications, including many related to space weather and its effects on communications.