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Theta phase coding in a network model of the entorhinal cortex layer II with entorhinal-hippocampal loop connections

Content Provider	PubMed Central
Author	Igarashi, Jun Hayashi, Hatsuo Tateno, Katsumi
Abstract	We investigated successive firing of the stellate cells within a theta cycle, which replicates the phase coding of place information, using a network model of the entorhinal cortex layer II with loop connections. Layer II of the entorhinal cortex (ECII) sends signals to the hippocampus, and the hippocampus sends signals back to layer V of the entorhinal cortex (ECV). In addition to this major pathway, projection from ECV to ECII also exists. It is, therefore, inferred that reverberation activity readily appears if projections from ECV to ECII are potentiated. The frequency of the reverberation would be in a gamma range because it takes signals 20–30 ms to go around the entorhinal-hippocampal loop circuits. On the other hand, it has been suggested that ECII is a theta rhythm generator. If the reverberation activity appears in the entorhinal-hippocampal loop circuits, gamma oscillation would be superimposed on a theta rhythm in ECII like a gamma-theta oscillation. This is a reminiscence of the theta phase coding of place information. In this paper, first, a network model of ECII will be developed in order to reproduce a theta rhythm. Secondly, we will show that loop connections from one stellate cell to the other one are selectively potentiated by afferent signals to ECII. Frequencies of those afferent signals are different, and transmission delay of the loop connections is 20 ms. As a result, stellate cells fire successively within one cycle of the theta rhythm. This resembles gamma-theta oscillation underlying the phase coding. Our model also replicates the phase precession of stellate cell firing within a cycle of subthreshold oscillation (theta rhythm).
Related Links	http://dx.doi.org/10.1007/s11571-006-9003-8
Ending Page	184
Page Count	16
Starting Page	169
File Format	PDF
ISSN	18714080
e-ISSN	18714099
Journal	Cognitive Neurodynamics
Issue Number	2
Volume Number	1
Language	English
Publisher	Kluwer Academic Publishers
Publisher Date	2007-05-04
Access Restriction	Open
Rights Holder	Kluwer Academic Publishers
Subject Keyword	Cognitive Neuroscience Research in Higher Education
Content Type	Text
Resource Type	Article
Subject	Cognitive Neuroscience

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