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Theoretical analysis of a time-frequency-PCNN auditory cortex model

INTERNATIONAL JOURNAL OF neural SYSTEMS 2005年第5期15卷 339-347页

作者： Volkmer, M Hamburg Univ Technol Dept Distributed Syst D-21073 Hamburg Germany

A particular pulsed neural model of the auditory cortex, the Time-Frequency Pulse Coupled neural Network (TF-PCNN), has shown to decompose its stimulus from the cochlea into characteristic pulse-coded time-frequency (TF) stop and pass regions. A derived sum of spectrograms representation with these zero- or one-valued TF weightings has already been applied for the denoising of speech in a previous work. This decomposition is now related to the concept of TF projection filters, which allows to reinterpret the model equations. The functionality imposed by the model equations can so be accessed and justified from a TF signal processing perspective, in addition to its biological motivation from experimentally observed neurophysiological behavior and simulations.

关键词： pulsed neural networks time-frequency analysis spectro-temporal receptive fields population coding sparse neural code

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A pulsed neural network model of spectro-temporal receptive fields and population coding in auditory cortex

引用

Natural Computing 2004年第2期3卷 177-193页

作者： Volkmer, Markus Technical University Hamburg-Harburg Dept. of Computer Engineering VI D-21073 Hamburg Germany

The existence of spectro-temporal receptive fields and evidence for population coding in auditory cortex motivate the development of such models, that explicitly operate in the time-frequency domain and are based on a pulsed neural network. In presenting such a model, a formal connection of the fields of Time Frequency Analysis and Pulsed neural Networks is established. The resulting neural time-frequency signal representation is shown to be representable as a signal-dependent overcomplete dictionary. It is derived from neural population coding. Signal decomposition and filtering effects are presented, indicating obvious technical applications of the proposed model. © 2004 Kluwer Academic Publishers.

关键词： Auditory cortex model Overcomplete dictionary Population coding Pulsed neural networks sparse neural code spectro-temporal receptive fields time-frequency analysis

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