Hi! I’m Kohei Kajikawa（梶川康平）, a first-year PhD student at NINJAL. I will join Georgetown (Computational) Linguistics as a PhD student in Fall 2025. My research lies at the intersection of computational linguistics and psycholinguistics.
I am particularly interested in how humans can comprehend sentence meaning through the use of hierarchical linguistic structures such as syntax. And I am curious about why language structures are the way they are. In particular, I investigate to what extent principles of communicative efficiency can (and cannot) account for the syntactic patterns observed across languages.
News
- 04.2025: Our study will be presented at CogSci2025!
- 04.2025: I have been selected for the Japan Society for the Promotion of Science (JSPS) Research Fellowship (DC1).
- 12.2024: Our paper, Is Structure Dependence Shaped for Efficient Communication?: A Case Study on Coordination, has received Best Paper Award at CoNLL2024!
Publications
- Kohei Kajikawa, Yusuke Kubota, and Yohei Oseki. 2024. Is Structure Dependence Shaped for Efficient Communication?: A Case Study on Coordination. In Proceedings of the 28th Conference on Computational Natural Language Learning, pages 291–302, Miami, FL, USA. 🏆Best Paper Award [pdf] [slides] [code] [arXiv]
- Kohei Kajikawa, Ryo Yoshida, and Yohei Oseki. 2024. Dissociating Syntactic Operations via Composition Count. In Proceedings of the 46th Annual Meeting of the Cognitive Science Society (CogSci), pages 297–305, Rotterdam, the Netherlands. [pdf] [slides] [code]
- Kohei Kajikawa. 2023. Analyzing Japanese Cleft Construction in Combinatory Categorial Grammar. In Proceedings of Logic and Engineering of Natural Language Semantics 20 (LENLS), pages 99–103, Osaka, Japan. [pdf] [slides]
- Shinnosuke Isono, Takuya Hasegawa, Kohei Kajikawa, Koichi Kono, Shiho Nakamura, and Yohei Oseki. 2023. Formalizing Argument Structures with Combinatory Categorial Grammar. Lecture Notes in Computer Science, pages 83–99. [pdf] [slides]
Preprints
- Kai Nakaishi, Ryo Yoshida, Kohei Kajikawa, Koji Hukushima, and Yohei Oseki. Rethinking the Relationship between the Power Law and Hierarchical Structures. arXiv. 05.2025. [pdf]
- Ryo Yoshida, Shinnosuke Isono, Kohei Kajikawa, Taiga Someya, Yushi Sugimito, and Yohei Oseki. If Attention Serves as a Cognitive Model of Human Memory Retrieval, What is the Plausible Memory Representation?. arXiv. 02.2025. [pdf]
Awards
- Young Researchers Award, The Association for Natural Language Processing, 03.2025
- Committee Special Award, The Association for Natural Language Processing, 03.2025
- CoNLL 2024 Best Paper Award, 12.2024
- Best Presentation Award, The Linguistic Society of Japan, 11.2024
- Committee Special Award, The Association for Natural Language Processing, 03.2024
Fellowships
- 04.2025 - 03.2028: JSPS Fellowship (DC1)
Education
- 04.2025 - Present: National Institute of Japanese Language and Linguistics (NINJAL), PhD in Linguistics.
- 04.2023 - 03.2025: The University of Tokyo, MA in Linguistics.
- 04.2019 - 03.2023: The University of Tokyo, BA in Linguistics (minor in Computer Science).
Activities in Japan
国内学会
- 磯野真之介*, 梶川康平*, 杉本侑嗣*, 浅原正幸, 大関洋平. 2025/03. CCGによる日本語脳波データのモデリング. 言語処理学会第31回年次大会, 4023-4028, 長崎. 🏆委員特別賞.（*は同等の貢献を表す） [pdf]
- 梶川康平, 磯野真之介, 窪田悠介, 大関洋平. 2025/03. 認知負荷の最適化戦略としての自由語順と項省略. 言語処理学会第31回年次大会, 1510-1514, 長崎. 🏆若手奨励賞 [pdf] [poster]
- 赤間美香, 梶川康平, 大関洋平. 2025/03. 統語情報は脳情報デコーディングに寄与するのか？. 言語処理学会第31回年次大会, 3602-3606, 長崎. [pdf]
- 吉田遼, 磯野真之介, 梶川康平, 染谷大河, 杉本侑嗣, 大関洋平. 2025/03. アテンションが記憶想起の認知モデルたりうるならば、記憶の表現としては何が妥当か？. 言語処理学会第31回年次大会, 1357-1362, 長崎. [pdf]
- 中石海, 吉田遼, 梶川康平, 福島孝治, 大関洋平. 2025/03. 自然言語における冪則と統語構造の関係の再考. 言語処理学会第31回年次大会, 37-41, 長崎. [pdf]
- 磯野真之介, 梶川康平, 大関洋平. 2024/06. 日本語大規模読み時間コーパスにおける記憶の負荷のCCGによるモデリング. 第168回 日本言語学会大会, 63-69, 東京. 🏆大会発表賞. [pdf]
- 梶川康平, 窪田悠介, 大関洋平. 2024/03. 統語変形はコミュニケーションから創発するのか？. 言語処理学会第30回年次大会, 2233-2237, 神戸. 🏆委員特別賞. [pdf]
- 梶川康平, 吉田遼, 大関洋平. 2023/03. CCGによる日本語文処理のモデリング. 言語処理学会第29回年次大会, 2984-2989, 沖縄. [pdf] [slides]
- 磯野真之介*, 梶川康平*, 吉田遼*, 大関洋平. 2023/03. 極小主義に動機づけられた統語的教示に基づく言語モデル. 言語処理学会第29回年次大会, 952-957, 沖縄.（*は同等の貢献を表す） [pdf]
解説記事
- 梶川康平. 2025/03. 計算心理言語学の新地平開拓の試み：効率的なコミュニケーション仮説の検証. 自然言語処理, pages 372-378. [pdf]
招待講演
- 梶川康平. 2025/01/29. Is Structure Dependence Shaped for Efficient Communication? A Case Study on Coordination. NLPコロキウム, オンライン. [slides] [video]
その他
- 梶川 康平. 2025/02/01. 言語の起源はコミュニケーションか?：計算心理言語学の観点から. 言語学フェス2025, オンライン. [poster]
- 梶川康平, 窪田悠介, 大関洋平. 2024/01/20. 統語変換は文化進化から生じるのか？：等位接続構造での検討. 言語学フェス2024, オンライン.
- 梶川康平, 窪田悠介, 大関洋平. 2024/01/16. 統語変換はコミュニケーションから創発するのか？. 第256回NINJALサロン, 国立国語研究所.
- 梶川康平. 2023/03/29. CCGによる日本語文処理のモデリング. Encouraging Workshop on Formal Linguistics 8 (EWFL8), 東京大学駒場キャンパス. [slides]