Neuroscientist Ryan McGarry prepares Jennie Litvack, 52, an economist, to participate in research at Spark Experience, a firm that is using EEG, eye tracking and other technologies to record how participants respond to political candidates.
Credit: Bonnie Jo Mount/The Washington Post
Neuroscientist Ryan McGarry swabbed a brain activity headset with saline solution and lowered it onto Brian Hazel's head, connecting circular prongs gingerly to different spots on his skull.
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