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- Z. Szatmary, M. Lengyel,
P. Erdi, and K. Obermayer. Using Temporal Associations to Model the
Development of Place Fields in a Novel Environment.
.
In European J. Neurosci., volume 10, page 39. European Forum of
Neuroscience ENA, 1998.
A computational model of the hippocampal CA3 area of the rat is
presented to simulate the formation of new place fields in a novel
environment. We assume that place fields are formed by establishing
associations between afferent activation patterns that represent spatially
proximal locations and orientations of the rat. Using a recurrent
connectionist network model we explore the hypothesis that the hippocampus
exploits temporal correlations between the afferent input patterns and thus
utilizes the spatiotemporal continuity of the animals exploration route in
order to associate input patterns from nearby locations and views. The model
proposes that densely interconnected patches of pyramidal cells in
hippocampal CA3 area can serve as an anatomical substrate of short-term
memories, sustaining activities of patterns after the corresponding afferent
input has become unavailable. Hebbian modification of lateral connections
between patches leads to the necessary association between patterns that will
eventually lead to spatially selective firing of neurons. With this model we
could show that the assumption of spatially smooth input can be relaxed, and
even for the amp;quot;worst caseamp;quot; assumption of input
patterns that are randomly assigned to spatial locations and views, the input
patterns are associated together to form place fields due to the temporal
correlations in the input stream.
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