👋 About Me

Hi! I am a PhD student in Informatics at Indiana University Bloomington (IUB), where I am advised by Dr. Haewoon Kwak and Dr. Jisun An at Soda Lab. Currently, I also closely work with Dr. Katharina Reinecke (University of Washington). I was a visiting student at WildLab at the University of Washington for the summer of 2026.

My research broadly examines how AI systems shape human culture, particularly how they reshape our cultural products such as writing and other creative expressions, and what this means for cultural diversity and human identity. I am also interested in designing AI to leverage human diversity. My work draws on insights from cultural psychology, NLP, and HCI.

You can download my CV here.

📄 Preprints & Under Review

AI-Generated Email Drafts Shift Culturally Distinctive Communication Styles in Professional Email

Shintaro Sakai, Alice Gao, Yuichi Shoda, Katharina Reinecke

Predictive Vision-Language Multimodal Transformer for Continuous Affective Trajectory Forecasting in Multi-Party Social Interaction

Shintaro Sakai, Goren Gordon

Under review at the IEEE/CVF Winter Conference on Applications of Computer Vision.

Translation Gummy, or Lost in Translation? Cross-Cultural Conversations with a LLM-Powered Robot in Japan and the U.S.

Long-Jing Hsu, Shintaro Sakai, Weslie Khoo, Hiroki Sato, Manasi Swaminathan, Katherine M. Tsui, David J. Crandall, Selma Šabanovic

Under review at ACM Transactions on Human-Robot Interaction, 2025.

📜 Publications

Gendered Cultural Discourse in Japan Across the Prewar–Postwar Transition: Evidence from Historical Word Embeddings

Shintaro Sakai, Haewoon Kwak, Jisun An, Akira Matsui

EPJ Data Science, 2026.

Somatic in the East, Psychological in the West?: Investigating Clinically-Grounded Cross-Cultural Depression Symptom Expression in LLMs

Shintaro Sakai, Jisun An, Migyeong Kang, Haewoon Kwak

Proceedings of the 4th Workshop on Cross-Cultural Considerations in NLP (C3NLP 2026).

Justifying AI regulation: Examining multi-stakeholder responses to the AI Act

Kaisla Kajava, Ana Paula Gonzalez Torres, Antti Rannisto, Shintaro Sakai

Telematics and Informatics, 2025.