Neural Comput - Unsupervised formation of vocalization-sensitive neurons: a cortical model based on short-term and homeostatic plasticity.

Tópicos

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Resumo

The discrimination of complex auditory stimuli relies on the spatiotemporal structure of spike patterns arriving in the cortex. While recordings from auditory areas reveal that many neurons are highly selective to specific spatiotemporal stimuli, the mechanisms underlying this selectivity are unknown. Using computer simulations, we show that selectivity can emerge in neurons in an entirely unsupervised manner. The model is based on recurrently connected spiking neurons and synapses that exhibit short-term synaptic plasticity. During a developmental stage, spoken digits were presented to the network; the only type of long-term plasticity present was a form of homeostatic synaptic plasticity. From an initially unresponsive state, training generated a high percentage of neurons that responded selectively to individual digits. Furthermore, units within the network exhibited a cardinal feature of vocalization-sensitive neurons in vivo: differential responses between forward and reverse stimulus presentations. Direction selectivity deteriorated significantly, however, if short-term synaptic plasticity was removed. These results establish that a simple form of homeostatic plasticity is capable of guiding recurrent networks into regimes in which complex stimuli can be discriminated. In addition, one computational function of short-term synaptic plasticity may be to provide an inherent temporal asymmetry, thus contributing to the characteristic forward-reverse selectivity.

Resumo Limpo

discrimin complex auditori stimuli reli spatiotempor structur spike pattern arriv cortex record auditori area reveal mani neuron high select specif spatiotempor stimuli mechan under select unknown use comput simul show select can emerg neuron entir unsupervis manner model base recurr connect spike neuron synaps exhibit shortterm synapt plastic development stage spoken digit present network type longterm plastic present form homeostat synapt plastic initi unrespons state train generat high percentag neuron respond select individu digit furthermor unit within network exhibit cardin featur vocalizationsensit neuron vivo differenti respons forward revers stimulus present direct select deterior signific howev shortterm synapt plastic remov result establish simpl form homeostat plastic capabl guid recurr network regim complex stimuli can discrimin addit one comput function shortterm synapt plastic may provid inher tempor asymmetri thus contribut characterist forwardrevers select

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