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Coding with envelopes, receptive fields and plasticity

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If you have a question about this talk, please contact Dr Jean-Pascal Pfister.

Sensory information processing relies on the proper representation of scales of space and time of stimuli into the neural activity. We report on new insights into the organization of this representation, obtained from our extensive study of hte electric sense. This sense combines aspects of the senses of touch, vision and audition. We first present results on circuitry that enables a neural system to represent/extract the slow envelope waveforms that appear in carriers modulated by a narrowband input. The circuitry relies on noiseless near-threshold operation followed by a slow synapse. Noise can gate this envelope extraction. We then show how synchronous input is preferentially decoded by cells that have a large receptive field. And finally we present results on the possible role of short-term plasticity in coding in these contexts. We show that for stationary noisy signals conveyed through a population of dynamic synapses, there is, paradoxically, no preferential filtering, regardless of the mixture of facilitation and depression.

This talk is part of the Computational Neuroscience series.

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