They see you when you're sleeping. (Or sleepwalking, maybe.) They know when you're awake (and aware of specials). They know if you've been paying attention to the shopper specials. They can tell when you get excited about a price break.
Walmart has applied for a patent on a shopping cart that tracks your walking speed, heart rate, temperature, and grip. (And, of course, where you are in the store.) And then sends it to servers in the store to track how you feel about the store, its contents, and layout.
There is no indication that Walmart would be collecting any personal information.
(There is work on using heart rate as a biometric identifier ...)
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