Overview

• Researchers recorded 10‑second self-introduction videos from 64 Japanese undergraduates and collected impression ratings from a separate group of 63 peers, with both groups completing the BDI‑II.
• Automated analysis with OpenFace 2.0 linked increased activity in specific action units—AU01, AU05, AU20, and mouth‑opening AUs AU25/26/28—to higher subthreshold depression scores.
• Students reporting subthreshold symptoms were rated as less friendly, expressive, and likable, yet not more stiff, fake, or nervous by their peers.
• Results indicate muted positive expressivity associated with subthreshold depression and suggest potential for non-invasive early screening in schools, workplaces, and digital health platforms.
• Authors note limitations including a small, culturally narrow sample and recommend cross-cultural replication, privacy protections, and ethical oversight before any real-world use.