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A model of a multivalued associative memory is presented. This memory has the form of a fully connected attractor neural network composed of multistate complex-valued neurons. Such a network is able to perform the task of storing and recalling gray-scale images. It is also shown that the complex-valued fully connected neural network may be considered as a(More)
A method of extracting intuitive knowledge from neural network classifiers is presented in the paper. An algorithm which obtains crisp rules in the form of logical implications which approximately describe the neural network mapping is introduced. The number of extracted rules can be selected using an uncertainty margin parameter as well as by changing the(More)
This paper presents a model of a network of integrate-and-fire neurons with time delay weights, capable of invariant spatio-temporal pattern recognition. Spatio-temporal patterns are formed by spikes according to the encoding principle that the phase shifts of the spikes encode the input stimulus intensity which corresponds to the concentration of(More)
The olfactory system is a very efficient biological setup capable of odor information processing with neural signals. The nature of neural signals restricts the information representation to multidimensional temporal sequences of spikes. The information is contained in the interspike intervals within each individual neural signal and interspike intervals(More)
This paper proposes temporal-to-spatial dynamic mapping inspired by neural dynamics of the olfactory cortex. In our model the temporal structure of olfactory-bulb patterns is mapped to the spatial dynamics of the ensemble of cortical neurons. This mapping is based on the following biological mechanism: while anterior part of piriform cortex can be excited(More)
to serve on the dissertation committee.chowiak for their advice and support. I would also like to thank Glenna Haberzetle for her administrative assistance, essential to the effectiveness of our research efforts. Finally, and most importantly, I thank my mother Maria, my wife Anne, and God, for constant support and inspiration in all my efforts. Without(More)
The striking feature of the olfactory cortex is the spatial organization of its afferent and association connections and the resulting spatio-temporal neural dynamics. In order to produce maximum activity, pyramidal cells have to receive both afferent and association signals, temporally correlated in a specific way. We suggest that this integration(More)
Symbolic knowledge extraction from mapping/extrapolating neural networks is presented in the paper. An algorithm to obtain crisp rules in the form of logical implications which roughly describe the neural network mapping is introduced. The number of extracted rules can be selected using an uncertainty margin parameter as well as by changing the precision of(More)
L ARGELY motivated by neurobiological discoveries, neural network research is witnessing a significant shift of emphasis towards temporal coding, which uses time as an essential dimension in neural representations. Temporal coding is passionately debated in neuroscience and related fields, but in the last few years a large volume of physiological and(More)