NDLI: A model of hippocampal spiking responses to items during learning of a context-dependent task

Content Provider	PubMed Central
Author	Raudies, Florian Hasselmo, Michael E.
Copyright Year	2014
Abstract	Single unit recordings in the rat hippocampus have demonstrated shifts in the specificity of spiking activity during learning of a contextual item-reward association task. In this task, rats received reward for responding to different items dependent upon the context an item appeared in, but not dependent upon the location an item appears at. Initially, neurons in the rat hippocampus primarily show firing based on place, but as the rat learns the task this firing became more selective for items. We simulated this effect using a simple circuit model with discrete inputs driving spiking activity representing place and item followed sequentially by a discrete representation of the motor actions involving a response to an item (digging for food) or the movement to a different item (movement to a different pot for food). We implemented spiking replay in the network representing neural activity observed during sharp-wave ripple events, and modified synaptic connections based on a simple representation of spike-timing dependent synaptic plasticity. This simple network was able to consistently learn the context-dependent responses, and transitioned from dominant coding of place to a gradual increase in specificity to items consistent with analysis of the experimental data. In addition, the model showed an increase in specificity toward context. The increase of selectivity in the model is accompanied by an increase in binariness of the synaptic weights for cells that are part of the functional network.
Related Links	http://dx.doi.org/10.3389/fnsys.2014.00178
Starting Page	178
File Format	PDF
ISSN	16625137
e-ISSN	16625137
Journal	Frontiers in Systems Neuroscience
Volume Number	8
Language	English
Publisher	Frontiers Media S.A.
Publisher Date	2014-09-23
Access Restriction	Open
Rights Holder	Frontiers Media S.A.
Subject Keyword	Research in Higher Education
Content Type	Text
Resource Type	Article
Subject	Cognitive Neuroscience Cellular and Molecular Neuroscience Developmental Neuroscience

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