A pretty interesting method for reading someone’s mind is the subject of this video. Basically the researchers have studied the brain activity using an MRI while showing the participants a number of videos. They then used the brain activity they collected while the participants were watching different videos and made a composite video based on averages. While it is not perfect mind reading, you can see some resemblance to the original input. Regardless it is fascinating and could lead to a number of fascinating new and wonderful things. Here are some links that discuss the project more thoroughly:
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