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The patent filing describes a “head mounted device”, for example hi-tech glasses, that would have the ability to track eye movement, effectively monitoring reactions to external stimuli, including changes in emotion.
The patent indicates that Google would use the technology to analyze reactions to advertisements that the user is watching on a television, computer, or other viewing device
“The inferred emotional state information can be provided to an advertiser so that the advertiser can gauge the success of their advertising campaign.” the patent states.
The application also states that users would be able to access a “gazing log” that would track everything they had previously looked at, much like a web browser history log.