Constructing the inclusive algorithm which can explain various group formation

• Project/Area Number: 19K20641
• Research Category: Grant-in-Aid for Early-Career Scientists
• Allocation Type: Multi-year Fund
• Review Section: Basic Section 90030:Cognitive science-related
• Research Institution: University of Tsukuba
• Principal Investigator: Niizato Takayuki 筑波大学, システム情報系, 助教 (00700163)
• Project Period (FY): 2019-04-01 – 2021-03-31
• Project Status: Completed (Fiscal Year 2020)
• Budget Amount: ¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000); Fiscal Year 2020: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000); Fiscal Year 2019: ¥2,730,000 (Direct Cost: ¥2,100,000、Indirect Cost: ¥630,000)
• Keywords: 自己組織化 / 統合情報理論 / 相互予期 / 臨界現象 / 魚の群れ / 集団現象 / 群れ / 内的因果関係 / 創発現象

Outline of Research at the Start

本研究は、特に魚や鳥の群れの代表的な振る舞いである形態形成、情報伝達、探索 行動の3つの振る舞いを同時に実現できる包括的アルゴリズムを解明することである。本研究では、申請者の提案する個体間の不完全な指示による相互作用モデルを包括的アルゴリズ ムの候補とし、他の2つの代表的アルゴリズムとの比較と、鮎の群れによる実験的評価を同時に行うことで、これまでのモデルに変わる新しい基盤となる群れのモデルの構築を目指す。

Outline of Final Research Achievements

In this study, we constructed a new flocking model as a mutual prediction via ambiguous references. Our model has succeeded in achieving different states that are seemingly difficult to reconcile. In other words, knowing each other's "approximate position" helps to integrate the flocks while at the same time avoiding extreme convergence. Furthermore, our data analysis revealed that such ambiguous interactions contribute to the formation of various causal structures in real fish schools (sweetfish), according to the size of the school.

Academic Significance and Societal Importance of the Research Achievements

本研究で解読しようと試みた曖昧な相互作用とは、群れにいる他者の行動を未来を含めて大まかに知覚することであり、その知覚を通して一つの社会性を実現する。本研究において示したことは、そのような相互作用を持つ動物の群れは単なる足し算ではなく、常に異質なものを取り込みながら群れのあり方自体を変容させていくという開かれたプロセスであることを示唆するものである。我々の研究を通して、群れの個性に合わせた活用という道が開かれるかもしれない。

Research Products

• [Journal Article] Classification of Causal Structure in <i>Plecoglossus altivelis</i> via Integrated Information Theory (2021)
  • Author(s): NIIZATO Takayuki
  • Journal Title: Seibutsu Butsuri Volume: 61 Issue: 1 Pages: 027-029
  • DOI: 10.2142/biophys.61.027
  • NAID: 130007976660
  • ISSN: 0582-4052, 1347-4219
  • Peer Reviewed
• [Journal Article] Finding continuity and discontinuity in fish schools via integrated information theory. (2020)
  • Author(s): Takayuki Niizato, Kotaro Sakamoto, Yoh-ichi Mototake, Hisashi Murakami, Takenori Tomaru, Tomotaro Hoshika, Toshiki Fukushima
  • Journal Title: PLOS ONE Volume: 15 Issue: 2 Pages: 1-29
  • DOI: 10.1371/journal.pone.0229573
  • NAID: 120007159527
  • Peer Reviewed / Open Access
• [Journal Article] Four-Types of IIT-Induced Group Integrity of Plecoglossus altivelis (2020)
  • Author(s): Niizato Takayuki、Sakamoto Kotaro、Mototake Yoh-ichi、Murakami Hisashi、Tomaru Takenori、Hoshika Tomotaro、Fukushima Toshiki
  • Journal Title: Entropy Volume: 22 Issue: 7 Pages: 726-726
  • DOI: 10.3390/e22070726
  • NAID: 120007163358
  • Peer Reviewed / Open Access
• [Journal Article] Revealing the existence of the ontological commitment in fish schools (2020)
  • Author(s): Niizato Takayuki、Sakamoto Kotaro、Mototake Yoh-ichi、Murakami Hisashi、Nishiyama Yuta、Fukushima Toshiki
  • Journal Title: Artificial Life and Robotics Volume: 25 Issue: 4 Pages: 633-642
  • DOI: 10.1007/s10015-020-00658-8
  • Peer Reviewed
• [Journal Article] Propagating wave based on transition of interaction within animal group (2019)
  • Author(s): Sonoda K, Murakami H, Niizato T, Tomaru T, Nishiyama Y, Gunji YP
  • Journal Title: Bio Systems Volume: 185 Pages: 104019-104019
  • DOI: 10.1016/j.biosystems.2019.104019
  • Peer Reviewed / Open Access
• [Journal Article] Levy-walk pattern in the exploratory behavior of the Physarum plasmodium (2019)
  • Author(s): Shirakawa T, Niizato T, Sato H, Ohno R
  • Journal Title: Bio Systems Volume: 182 Pages: 52-58
  • DOI: 10.1016/j.biosystems.2019.103985
  • Peer Reviewed
• [Presentation] Information storage and transfer in ayus (Plecoglossus altivelis) (2021)
  • Author(s): 福島俊紀, 新里高行
  • Organizer: AROB 26th
  • Int'l Joint Research
• [Presentation] アユの振る舞いが互いに及ぼす影響の情報理論的解析 (2020)
  • Author(s): 福島俊紀, 新里高行
  • Organizer: 日本動物行動学会
• [Presentation] Heap Paradox in fish schools (2019)
  • Author(s): Takayuki Niizato, Kotaro Sakamoto, Yoh-ichi Mototake, Hisashi Murakami, Yuta Nishiyama, Tomotaro Hoshika, Toshiki Fukushima
  • Organizer: SWARM 2019
  • Int'l Joint Research
• [Book] Swarm Intelligence From Social Bacteria to Humans (2020)
  • Author(s): Andrew Schumann
  • Total Pages: 190
  • Publisher: CRC Press
• [Remarks] 鮎は４匹以上の群れになるとリーダーが出現する
  • URL: https://www.tsukuba.ac.jp/journal/technology-materials/20200406140004.html
• [Remarks] 「群れ」はサイズに応じて異なる性質を持つ
  • URL: https://www.tsukuba.ac.jp/journal/technology-materials/20200706140049.html
• [Remarks] 鮎は４匹以上の群れになるとリーダーが出現する
  • URL: http://www.tsukuba.ac.jp/wp-content/uploads/200406niizato-1.pdf