The Bernstein Center Freiburg




Informal Seminar
Taskin Deniz

SISSA
Trieste, Italy



TRANSIENT REMAPPING DYNAMICS IN CA3 ATTRACTOR NETWORK
Wednesday, May 5, 2010
11:00 h sharp
Library
Bernstein Center
Hansastr. 9a
Abstract:
It is a widely held hypothesis that information is stored in distributed synaptic efficacies as attractors such that previous experience can be recalled when partial cues are presented or working memories can be maintained when accomplishing a task. This hypothesis has been supported by evidences found during memory tasks in many areas of the brain, such as IT cortex and CA3 area in hippocampus.
Inspired by recent experimental studies of attractor mechanism in rodent spatial representations in CA3 area, we propose an Attractor Neural Network model with neural adaptation mechanism to model the transient dynamics of remapping in CA3. We investigate stability (number of attractors etc.) and dynamical properties (under change of cues) of multichart spatial representations. It turns out that under cues which carry a trace of the former representation after an abrupt change of environments, the network alternates between representations of two environments due to the adaptation mechanism, demonstrating the ability of switching between two memory traces.
The talk is open to the public. Guests are cordially invited!
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