The researchers found that the fluctuations seen in the participants' heart rates were predictive of how well they did at answering questions about the story - more synchronization predicted better test scores. In the third experiment, the subjects listened to short children's stories, some while attentive and others while being distracted, and then were asked to recall facts from the stories. That time, the lack of attention resulted in a drop in the synchronization of heart rates across subjects, confirming that attention was important. The participants then watched the videos a second time while counting backwards in their heads. The first time they watched the videos, heart rates across the subjects showed similar fluctuations. Because the videos were educational with no underlying emotional variations, this experiment confirmed that emotional engagement in a story was not playing a part. In the second experiment, volunteers watched short instructional videos. The researchers found that the majority of subjects showed increases and decreases in their heart rate at the same points in the narrative. As they listened, their heart rate changed based on what was happening in the story, as measured by electrocardiogram (EKG). In the first, healthy volunteers listened to an audiobook of Jules Verne's 20,000 Leagues Under the Sea. The investigators conducted a series of four experiments to explore the role of consciousness and attention in synchronizing participants' heart rates. Your heart responds to those signals from the brain." "It's not about emotions, but about being engaged and attentive, and thinking about what will happen next. "What's important is that the listener is paying attention to the actions in the story," adds co-senior author Jacobo Sitt a researcher at the Paris Brain Institute and Inserm. It's the cognitive function that drives your heart rate up or down." "What we have found is that the phenomenon is much broader, and that simply following a story and processing stimulus will cause similar fluctuations in people's heart rates. But the premise is that somehow you're interacting and physically present the same place," says co-senior author Lucas Parra, a professor at City College of New York. "There's a lot of literature demonstrating that people synchronize their physiology with each other.
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