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• W4361994494 abstract "Abstract In many situations it is behaviorally relevant for an animal to respond to co-occurrences of perceptual, possibly polymodal features, while these features alone may have no importance. Thus, it is crucial for animals to learn such feature combinations in spite of the fact that they may occur with variable intensity and occurrence frequency. Here, we present a novel unsupervised learning mechanism that is largely independent of these contingencies and allows neurons in a network to achieve specificity for different feature combinations. This is achieved by a novel correlation-based (Hebbian) learning rule which allows for linear weight growth and which is combined with a mechanism for gradually reducing the learning rate as soon as the neuron’s response becomes feature combination specific. In a set of control experiments, we show that other existing advanced learning rules cannot satisfactorily form such multi-feature representations. In addition, we show that networks, which use this type of learning always stabilize and converge to subsets of neurons with different feature-combination specificity. Neurons with this property may, thus, serve as an initial stage for the processing of ecologically relevant real world situations for an animal." @default.
• W4361994494 created "2023-04-05" @default.
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• W4361994494 date "2023-03-31" @default.
• W4361994494 modified "2023-10-17" @default.
• W4361994494 title "Unsupervised Learning of Perceptual Feature Combinations" @default.
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• W4361994494 doi "https://doi.org/10.1101/2023.03.31.535126" @default.
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