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Pretty similar to an older Nature paper, using smart speakers to monitor heart rate.

Wang, A., Nguyen, D., Sridhar, A.R. et al. Using smart speakers to contactlessly monitor heart rhythms. Commun Biol 4, 319 (2021). https://doi.org/10.1038/s42003-021-01824-9

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Is this the paper where they try and detect "emotional states" from heart rate and motion with moderate success? I could imagine this technology being deployed in public spaces in autocratic/repressive countries to screen for citizens who seem to be feeling hostile or angry.

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