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• W2024005265 abstract "A study has been made of the behaviour of a set of variable pathways from different inputs and which converge on a single output; input and output signals are all-or-none. For two particular laws the system has been treated analytically and by computer simulation under various input conditions. The two laws are, (1) that the conductivity of a pathway is proportioned to the negative of the Shannon information function between the signals at the input and the output of the pathway and, (2) that the total excitation arriving at the output determines the probability of an output signal. The change in frequency of the binary signals in a pathway is a measure of the change in probability of the quantity associated with that pathway; this f.m. code is the same for inputs and outputs. It has been found that such a system adapts to become a discriminator of the most frequent pattern occurring in the set of input signals during adaptation. Inputs which are statistically independent of the pattern become disconnected from the output. Thereafter, if any new pattern occurs, the change in frequency of the output signals is a measure of the similarity of the new pattern to the learned pattern. The system has been called an informon because its output is a measure of the total information conveyed by all the inputs about the pattern to which the system has adapted; it can form a building brick for a multilayer pattern discrimination network with the ability to classify, associate and predict. Three conclusions of the paper are that: (1) an output point must be active spontaneously in the absence of input signals; (2) if the system is to adapt to discriminate a pattern occurring only briefly then a short term storage system must precede the informon; (3) if a pattern occurs for a very long time, all informon pathways return to zero connectivity; this can be avoided if pathways are given an additional property akin to magnetic hysteresis; there is then long-term storage and the informon becomes a permanent discriminator of the pattern to which it adapted. Experiments carried out elsewhere on pathways in parietal cortex of cat show that such pathways have two major properties of an informon pathway. It is suggested that it is the function of adaptive neural tissue to set up an informon pathway from one neurone to another, and that the mediating components are the excitatory and inhibitory synapses, and the sites of pre-synaptic and post-synaptic excitation and inhibition which may lie between these two neurones." @default.
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• W2024005265 title "The informon: A network for adaptive pattern recognition" @default.
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• W2024005265 doi "https://doi.org/10.1016/0022-5193(70)90128-1" @default.
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