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Nelson Hidalgo Julia, Robert Lewis, Craig Ferguson, Joshua Angulo Lopez, Hahrin Jung, Rosalind Picard, Simon Goldberg, Raquel Tatar, Wendy S.-Y. Lau, Caroline Swords, Christine D. Wilson-Mendenhall, Gabriela Valdivia, Molly Schaefer, and Richard Davidson. 2026. Designing an Affective Mobile Probe to Measure Smile Dynamics in Depression. In Proceedings of the 2026 CHI Conference on Human Factors in