About: The Sync/deSync model: How a synchronized hippocampus and a de-synchronized neocortex code memories

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Title	The Sync/deSync model: How a synchronized hippocampus and a de-synchronized neocortex code memories
described by	https://demo.openlinksw.com/about/id/entity/https/www.cs.kent.ac.uk/people/staff/akj22/materials/CO644/export_kar_RDFN3.n3 https://demo.openlinksw.com/about/id/entity/https/raw.githubusercontent.com/annajordanous/CO644Files/main/export_kar_RDFN3.n3
Date	2018-04-04
Creator	George Parish Howard Bowman Simon Hanslmayr
status	peer reviewed published
Publisher	Society for Neuroscience
abstract	Neural oscillations are important for memory formation in the brain. The de-synchronisation of Alpha (10Hz) oscillations in the neo-cortex has been shown to predict successful memory encoding and retrieval. However, when engaging in learning, it has been found that the hippocampus synchronises in Theta (4Hz) oscillations, and that learning is dependent on the phase of Theta. This inconsistency as to whether synchronisation is ‘good' for memory formation leads to confusion over which oscillations we should expect to see and where during learning paradigm experiments. This paper seeks to respond to this inconsistency by presenting a neural network model of how a well-functioning learning system could exhibit both of these phenomena, i.e. desynchronization of Alpha and synchronisation of Theta during successful memory encoding. We present a spiking neural network (the Sync/deSync model) of the neo-cortical and hippocampal system. The simulated hippocampus learns through an adapted spike-time dependent plasticity rule, in which weight change is modulated by the phase of an extrinsically generated Theta oscillation. Additionally, a global passive weight decay is incorporated, which is also modulated by Theta phase. In this way, the Sync/deSync model exhibits Theta phase-dependent long-term potentiation and long-term depression. We simulated a learning paradigm experiment and compared the oscillatory dynamics of our model with those observed in single-cell and scalp-EEG studies of the medial temporal lobe. Our Sync/deSync model suggests that both the de-synchronisation of neo-cortical Alpha and the synchronisation of hippocampal Theta are necessary for successful memory encoding and retrieval.
Is Part Of	The Journal of Neuroscience https://kar.kent.ac.uk/id/repository
Subject	QA 76 Software, computer programming, RC321 Neuroscience. Biological psychiatry. Neuropsychiatry
list of authors	https://kar.kent.ac.uk/id/eprint/66377#authors
issue	14
volume	38
is topic of	https://www.cs.kent.ac.uk/people/staff/akj22/materials/CO644/export_kar_RDFN3.n3 https://raw.githubusercontent.com/annajordanous/CO644Files/main/export_kar_RDFN3.n3
is primary topic of	HTML Summary of #66377 The Sync/deSync model: How a synchronized hippocampus and a de-synchronized neocortex code memories

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