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Paper Abstract and Keywords
Presentation 2005-11-19 13:40
Theta phase coding due to entorhinal cortex - hippocampal loop circuits organized by sensory signals
Jun Igarashi, Katsumi Tateno, Hatsuo Hayashi (kyutech)
Abstract (in Japanese) (See Japanese page) 
(in English) When a rat crosses the certain region of an experimental apparatus, certain neurons in the hippocampal region or the entorhinal cortex discharge. This is a place cell. The region is the place field of the place cell. When the rat enters the place field, the place cell begins firing at a later phase of the theta rhythm. The firing phase of the place cell advances with approaching the center of the place field. This is a phase coding of the place cell. We have previously proposed that an entorhinal cortex layer II model with predetermined feedback loops can encode the place information as the phase coding. In the present study, the feedback loop from the stellate cells to the stellate cells in the entorhinal cortex model was automatically retrieved by the spike timing dependent plasticity rule (STDP). The difference in the firing rate of the external input to the stellate cells led to the phase difference of spikes of the stellate cells. The phase difference of spikes between the stellate cells modified the synaptic weight using STDP. After the learning was completed, the present entorhinal cortex layer II model exhibits the phase precession.
Keyword (in Japanese) (See Japanese page) 
(in English) entorhinal cortex / subthreshold oscillations / theta rhythm / phase precession / phase coding / / /  
Reference Info. IEICE Tech. Rep., vol. 105, no. 417, NLP2005-79, pp. 47-52, Nov. 2005.
Paper # NLP2005-79 
Date of Issue 2005-11-12 (NLP) 
ISSN Print edition: ISSN 0913-5685
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Conference Information
Committee NLP  
Conference Date 2005-11-18 - 2005-11-19 
Place (in Japanese) (See Japanese page) 
Place (in English) Kyushu Institute of Technology 
Topics (in Japanese) (See Japanese page) 
Topics (in English) Special session and general. Subject of special session is ``Randomness and prediction---from fundamentals to applications''. 
Paper Information
Registration To NLP 
Conference Code 2005-11-NLP 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Theta phase coding due to entorhinal cortex - hippocampal loop circuits organized by sensory signals 
Sub Title (in English)  
Keyword(1) entorhinal cortex  
Keyword(2) subthreshold oscillations  
Keyword(3) theta rhythm  
Keyword(4) phase precession  
Keyword(5) phase coding  
1st Author's Name Jun Igarashi  
1st Author's Affiliation Kyushu Institute of Technology (kyutech)
2nd Author's Name Katsumi Tateno  
2nd Author's Affiliation Kyushu Institute of Technology (kyutech)
3rd Author's Name Hatsuo Hayashi  
3rd Author's Affiliation Kyushu Institute of Technology (kyutech)
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Speaker Author-1 
Date Time 2005-11-19 13:40:00 
Presentation Time 25 minutes 
Registration for NLP 
Paper # NLP2005-79 
Volume (vol) vol.105 
Number (no) no.417 
Page pp.47-52 
Date of Issue 2005-11-12 (NLP) 

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