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Modeling the dishabituation hierarchy: The role of the primordial hippocampus

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Abstract

We present a neural model for the organization and neural dynamics of the medial pallium, the toad's homolog of mammalian hippocampus. A neural mechanism, called cumulative shrinking, is proposed for mapping temporal responses from the anterior thalamus into a form of population coding referenced by spatial positions. Synaptic plasticity is modeled as an interaction of two dynamic processes which simulates acquisition and both short-term and long-term forgetting. The structure of the medial pallium model plus the plasticity model allows us to provide an account of the neural mechanisms of habituation and dishabituation. Computer simulations demonstrate a remarkable match between the model performance and the original experimental data on which the dishabituation hierarchy was based. A set of model predictions is presented, concerning mechanisms of habituation and cellular organization of the medial pallium

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The research described in this paper was supported in part by grant no. 1RO1 NS 24926 from the National Institutes of Health (M.A.A., Principal Investigator)

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Wang, D., Arbib, M.A. Modeling the dishabituation hierarchy: The role of the primordial hippocampus. Biol. Cybern. 67, 535–544 (1992). https://doi.org/10.1007/BF00198760

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