One of those is the presence of a human pulse. In the past, AI models that detected a noticeable pulse or heart rate could confidently classify those clips as genuine.

While a global heart rate can be spoofed, the spatial distribution of blood flow in a live human face still eludes current synthesis methods.

The researchers created 32 AI-generated videos modeled on real footage of human participants. Each fake video appeared lifelike, and—crucially—registered a false positive for a human pulse ...

IN the normal human being, ... Kinsey, D., and Whitelaw, G. P. Human heart rate: some observations and deductions based upon effect of removing portions of sympathetic nervous system in man.