Modeling the dishabituation hierarchy: The role of the primordial hippocampus

✍ Scribed by DeLiang Wang; Michael A. Arbib

• Publisher: Springer-Verlag
• Year: 1992
• Tongue: English
• Weight: 979 KB
• Volume: 67
• Category: Article
• ISSN: 0340-1200
• DOI: 10.1007/bf00198760

✦ Synopsis

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.