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Resumen de Sleep signature reveals how much we dream

Chelsea Whyte

  • A new way to detect dreaming has confirmed that it doesn't only occur during rapid eye movement sleep, and has shown why people often don't remember their dreams. During sleep, low-frequency brainwaves are detectable across the brain. Now Francesca Siclari at the University of Wisconsin-Madison and her colleagues have discovered that a decrease in these waves in an area at the back of the brain is a sign that someone is dreaming. Siclari's team found this dream signature by using EEG caps to map the brain activity of 32 people while they slept. The team woke the sleepers when they showed various patterns of brainwave activity, and asked them if they had been dreaming. The team found such a strong correlation between dreaming and fewer low-frequency waves in the "hot zone" that they could successfully predict whether a person was dreaming 91 per cent of the time.


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