this post was submitted on 30 Apr 2025
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Deepfakes now come with a realistic heartbeat, making them harder to unmask (frontiersin.org)
submitted 18 hours ago by [email protected] to c/[email protected]
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Current algorithms for the detection of deepfakes increasingly rely on remote pulse reading to distinguish them from genuine videos of people. Here, scientists show for the first time that the most recent deepfakes feature a global pulse rate which appears realistic. This worrying development makes it necessary for deepfake detectors to become more powerful, for example, by focusing on local variations in blood flow within the face.

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[โ€“] [email protected] 12 points 18 hours ago (1 children)

Wait, they can detect your pulse via a video? How? Variation in flushing during systolic vs diastolic phases of the heartbeat? Unconscious synchronization of affect/verbalization/whatever with one's own heartbeat? Given the following, I think it must be closer to the former:

The analysis of the transmission of light through the skin and underlying blood vessels has long been indispensable in medicine, for example in pulse oximeters. Its digital cousin, so-called remote photoplethysmography (rPPP), is an emerging method in telehealthcare, which uses webcams to estimate vital signs. But rPPP can, in theory, also be used in deepfake detectors.

In recent years, such experimental rPPP-based deepfake detectors have proven good at distinguishing between real and deepfaked videos.