A neural network model of the episodic memory based on a word co-occurrence network

• Project/Area Number: 26540069
• Research Category: Grant-in-Aid for Challenging Exploratory Research
• Allocation Type: Multi-year Fund
• Research Field: Cognitive science
• Research Institution: Future University-Hakodate
• Principal Investigator: Sato Naoyuki 公立はこだて未来大学, システム情報科学部, 教授 (70312668)
• Project Period (FY): 2014-04-01 – 2016-03-31
• Project Status: Completed (Fiscal Year 2015)
• Budget Amount: ¥3,770,000 (Direct Cost: ¥2,900,000、Indirect Cost: ¥870,000); Fiscal Year 2015: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000); Fiscal Year 2014: ¥2,340,000 (Direct Cost: ¥1,800,000、Indirect Cost: ¥540,000)
• Keywords: 脳 / 神経科学 / ニューラルネットワーク / 認知科学 / 視覚 / 記憶

Outline of Final Research Achievements

Neural representation of complicated experiences in daily life is a fundamental issue for the understanding of the episodic memory. In this study, a neural representation analogous to a word co-occurrence network in a large text corpus was hypothesized as a cortical representation and it was evaluated by electroencephalogram (EEG) experiment and neural modeling using computer simulation. Results indicated that the hypothesized representation was available for detecting memory-related EEG components and explaining the memory based on a hippocampal network. It was suggested that the word co-occurrence network can produce a clue for the understanding of the episodic memory.

Research Products

• [Journal Article] 海馬認知地図の神経基盤―場所細胞とグリッド細胞 (2014)
  • Author(s): 佐藤直行
  • Journal Title: 岩波科学 Volume: 85 Pages: 82-84
• [Journal Article] Spatial consistency of neural firing regulates long-range local field potential synchronization: a computational study. (2014)
  • Author(s): Naoyuki Sato
  • Journal Title: Neural Networks Volume: 62 Pages: 52-61
  • Peer Reviewed
• [Journal Article] Coupling between spatial consistency of neural firing and localfield potential coherence: a computational study (2014)
  • Author(s): Naoyuki Sato
  • Journal Title: Lecture Notes in Computer Science Volume: 8834 Pages: 167-174
  • Peer Reviewed
• [Presentation] Subsequent memory-dependent BOLD activation during the natural reading of literature (2016)
  • Author(s): Naoyuki Sato, Hiroaki Mizuhara
  • Organizer: 22rd Annual Meeting of the Organization for Human Brain Mapping
  • Place of Presentation: ジュネーブ
  • Year and Date: 2016-06-26
  • Int'l Joint Research
• [Presentation] 脳大域回路の機能モデルの構築:実験と理論の融合的手法 (2015)
  • Author(s): 佐藤直行
  • Organizer: 東北大通研共同プロジェクト「ブレインウェアシステム」研究会
  • Place of Presentation: 東北大学通信研究所（宮城県仙台市）
  • Year and Date: 2015-12-21
  • Invited
• [Presentation] Predictability of subsequent retrieval after natural reading of literature: A scalp electroencephalogram study (2015)
  • Author(s): Naoyuki Sato
  • Organizer: 45th annual meeting of the society of neuroscience
  • Place of Presentation: シカゴ
  • Year and Date: 2015-10-17
  • Int'l Joint Research
• [Presentation] 海馬位相歳差モデルにおける文章列の記憶 (2015)
  • Author(s): 佐藤直行
  • Organizer: 第25 回日本神経回路学会全国大会
  • Place of Presentation: 電気通信大学（東京都調布市）
  • Year and Date: 2015-09-02
• [Presentation] Memory formation during the natural reading of literature: an EEG study (2015)
  • Author(s): Naoyuki Sato
  • Organizer: Human Brain Mapping
  • Place of Presentation: Honolulu
  • Year and Date: 2015-06-14 – 2015-06-18
• [Presentation] 海馬から大脳へ：記憶の計算モデル (2015)
  • Author(s): 佐藤直行
  • Organizer: 日本人工知能学会全国大会
  • Place of Presentation: 函館
  • Year and Date: 2015-05-30
  • Invited
• [Presentation] Coupling between spatial consistency of neural firing and localfield potential coherence: a computational study (2014)
  • Author(s): Naoyuki Sato
  • Organizer: 21th International Conference Neural Information Processing (ICONIP2014)
  • Place of Presentation: Kuching, Malaysia
  • Year and Date: 2014-11-03 – 2014-11-06
• [Presentation] 海馬神経回路の機能ダイナミクス (2014)
  • Author(s): 佐藤直行
  • Organizer: 第３回 全脳アーキテクチャ勉強会
  • Place of Presentation: リクルートGINZA8ビル（東京）
  • Year and Date: 2014-04-22
  • Invited