Information: Join today and make your research activities more affordable! Technical workshop participation fees and annual registration fees are available at member rates.
Notice: [Important] Announcement of Changes to Registration Fee Payment and Manuscript Upload Procedures for IEICE Technical Meetings
IEICE Technical Committee Submission System
Conference Paper's Information		 Online Proceedings
[Sign in]
Tech. Rep. Archives
 Go Top Page Go Previous   [Japanese] / [English] 

Paper Abstract and Keywords
Presentation 2026-07-02 14:20
Representational drift in hippocampal place cells enables extension of spatial memory representations into a newly expanded environment
Satoshi Shiga, Jun-nosuke Teramae (Kyoto Univ.) NC2026-3 IBISML2026-3
Abstract (in Japanese) (See Japanese page) 
(in English) Hippocampal place cells form cognitive maps that underlie spatial cognition and memory. Although the stability of these maps is thought to be essential for reliable spatial behavior, recent longitudinal recordings have revealed a paradoxical coexistence of continuously changing place fields with stable population-level representations and behavior. However, whether representational drift serves a functional role in memory systems remains unclear. Here, we develop a Bayesian learning model based on stochastic neuronal and synaptic dynamics and show that hippocampal place fields can self-organize from entorhinal grid cell inputs. The resulting representations exhibit continual reorganization of individual place fields while preserving stable population-level position coding, reproducing experimentally observed representational drift. Importantly, we find that representational drift is required for the expansion of cognitive maps into newly accessible space, whereas suppressing representational drift substantially impairs the reorganization of cognitive maps in expanded environments. Suggesting that representational drift is a functional computational principle that enables cognitive map expansion while preserving stable spatial representations, our results provide a framework for understanding how memory systems reconcile stability with flexibility in changing environments.
Keyword (in Japanese) (See Japanese page) 
(in English) hippocampus / place cell / representational drift / memory / Bayesian inference / / /  
Reference Info. IEICE Tech. Rep., vol. 126, no. 90, NC2026-3, pp. 11-16, July 2026.
Paper # NC2026-3 
Date of Issue 2026-06-25 (NC, IBISML) 
ISSN Online edition: ISSN 2432-6380
Copyright
and
reproduction		 All rights are reserved and no part of this publication may be reproduced or transmitted in any form or by any means, electronic or mechanical, including photocopy, recording, or any information storage and retrieval system, without permission in writing from the publisher. Notwithstanding, instructors are permitted to photocopy isolated articles for noncommercial classroom use without fee. (License No.: 10GA0019/12GB0052/13GB0056/17GB0034/18GB0034)
Download PDF NC2026-3 IBISML2026-3

Conference Information
Committee NC IBISML IPSJ-BIO IPSJ-MPS  
Conference Date 2026-07-01 - 2026-07-03 
Place (in Japanese) (See Japanese page) 
Place (in English) OIST 
Topics (in Japanese) (See Japanese page) 
Topics (in English)  
Paper Information
Registration To NC 
Conference Code 2026-07-NC-IBISML-BIO-MPS 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Representational drift in hippocampal place cells enables extension of spatial memory representations into a newly expanded environment 
Sub Title (in English)  
Keyword(1) hippocampus  
Keyword(2) place cell  
Keyword(3) representational drift  
Keyword(4) memory  
Keyword(5) Bayesian inference  
Keyword(6)  
Keyword(7)  
Keyword(8)  
1st Author's Name Satoshi Shiga  
1st Author's Affiliation Kyoto University (Kyoto Univ.)
2nd Author's Name Jun-nosuke Teramae  
2nd Author's Affiliation Kyoto University (Kyoto Univ.)
3rd Author's Name  
3rd Author's Affiliation ()
4th Author's Name  
4th Author's Affiliation ()
5th Author's Name  
5th Author's Affiliation ()
6th Author's Name  
6th Author's Affiliation ()
7th Author's Name  
7th Author's Affiliation ()
8th Author's Name  
8th Author's Affiliation ()
9th Author's Name  
9th Author's Affiliation ()
10th Author's Name  
10th Author's Affiliation ()
11th Author's Name  
11th Author's Affiliation ()
12th Author's Name  
12th Author's Affiliation ()
13th Author's Name  
13th Author's Affiliation ()
14th Author's Name  
14th Author's Affiliation ()
15th Author's Name  
15th Author's Affiliation ()
16th Author's Name  
16th Author's Affiliation ()
17th Author's Name  
17th Author's Affiliation ()
18th Author's Name  
18th Author's Affiliation ()
19th Author's Name  
19th Author's Affiliation ()
20th Author's Name  
20th Author's Affiliation ()
21st Author's Name  
21st Author's Affiliation ()
22nd Author's Name  
22nd Author's Affiliation ()
23rd Author's Name  
23rd Author's Affiliation ()
24th Author's Name  
24th Author's Affiliation ()
25th Author's Name  
25th Author's Affiliation ()
26th Author's Name / /
26th Author's Affiliation ()
()
27th Author's Name / /
27th Author's Affiliation ()
()
28th Author's Name / /
28th Author's Affiliation ()
()
29th Author's Name / /
29th Author's Affiliation ()
()
30th Author's Name / /
30th Author's Affiliation ()
()
31st Author's Name / /
31st Author's Affiliation ()
()
32nd Author's Name / /
32nd Author's Affiliation ()
()
33rd Author's Name / /
33rd Author's Affiliation ()
()
34th Author's Name / /
34th Author's Affiliation ()
()
35th Author's Name / /
35th Author's Affiliation ()
()
36th Author's Name / /
36th Author's Affiliation ()
()
Speaker Author-1 
Date Time 2026-07-02 14:20:00 
Presentation Time 25 minutes 
Registration for NC 
Paper # NC2026-3, IBISML2026-3 
Volume (vol) vol.126 
Number (no) no.90(NC), no.91(IBISML) 
Page pp.11-16 
#Pages 6 
Date of Issue 2026-06-25 (NC, IBISML) 

[Return to Top Page]

[Return to IEICE Web Page]
The Institute of Electronics, Information and Communication Engineers (IEICE), Japan