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It’s a device that measures someone’s unique response to a weak electric signal could let medical devices such as blood-pressure cuffs automatically identify the wearer and send measurements straight to his or her electronic medical record.

This is how it works:

One electrode on the device sends an alternating current through its wearer’s wrist to a second electrode. While the current is passing through the wrist, the electrodes detect the wrist’s resistance and reactivity, which are components of impedance. A processor extracted seven features from the electrode pattern, and the team then used a series of five readings per user to train the processor to recognize a given user’s bioimpedance profile.

Source: MIT

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