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As AR and VR slowly but surely gain traction in gaming, tech firms want to know where your head's at: Sony and Meta both filed patent applications for tech that tracks facial expressions while in an artificial reality device. 

Let's start with Meta. The company is seeking to patent a method for facial expression tracking that, in some examples, doesn't require "cameras or complex image data processing." Instead, Meta's tech uses an illuminator and a photon detector. 

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Source Fool.com