Neural Comput - Input statistics and Hebbian cross-talk effects.

Tópicos

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Resumo

As an extension of prior work, we studied inspecific Hebbian learning using the classical Oja model. We used a combination of analytical tools and numerical simulations to investigate how the effects of synaptic cross talk (which we also refer to as synaptic inspecificity) depend on the input statistics. We investigated a variety of patterns that appear in dimensions higher than two (and classified them based on covariance type and input bias). We found that the effects of cross talk on learning dynamics and outcome is highly dependent on the input statistics and that cross talk may lead in some cases to catastrophic effects on learning or development. Arbitrarily small levels of cross talk are able to trigger bifurcations in learning dynamics, or bring the system in close enough proximity to a critical state, to make the effects indistinguishable from a real bifurcation. We also investigated how cross talk behaves toward unbiased ("competitive") inputs and in which circumstances it can help the system productively resolve the competition. Finally, we discuss the idea that sophisticated neocortical learning requires accurate synaptic updates (similar to polynucleotide copying, which requires highly accurate replication). Since it is unlikely that the brain can completely eliminate cross talk, we support the proposal that is uses a neural mechanism that "proofreads" the accuracy of the updates, much as DNA proofreading lowers copying error rate.

Resumo Limpo

extens prior work studi inspecif hebbian learn use classic oja model use combin analyt tool numer simul investig effect synapt cross talk also refer synapt inspecif depend input statist investig varieti pattern appear dimens higher two classifi base covari type input bias found effect cross talk learn dynam outcom high depend input statist cross talk may lead case catastroph effect learn develop arbitrarili small level cross talk abl trigger bifurc learn dynam bring system close enough proxim critic state make effect indistinguish real bifurc also investig cross talk behav toward unbias competit input circumst can help system product resolv competit final discuss idea sophist neocort learn requir accur synapt updat similar polynucleotid copi requir high accur replic sinc unlik brain can complet elimin cross talk support propos use neural mechan proofread accuraci updat much dna proofread lower copi error rate

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