Interesting security research:
The system is simple in concept. Wolotsky and co’s idea is to use the body’s stress levels to determine whether they are being coerced in any way. And they do this by measuring the individual’s response to “chill” music they previously identified as relaxing.
Chill music is so-called because it provokes a shiver down the spine, a response that is similar to being cold. It is the physiological effects of this shiver that Wolotsky and co set out to measure by monitoring heartbeat and brain-wave patterns.
Their hypothesis is that these signals are impossible to fake and only possible to measure when the subject is relaxed. Any duress would result in a different signal.
To find out whether this is the case, the team asked five test subjects to choose their favorite piece of chill music and then monitored their heartbeat and brain waves while they listened.