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Lucid dreams are considered by many psychologists to be an intermediate stage between two forms of consciousness.In lucid dreaming, a state believed to be unique to humans, elements of secondary consciousness combine with REM dreams.Researchers led by Ursula Voss at the J.W. Goethe University Frankfurt, used a technique called transcranial alternating current stimulation to explore the causes of lucid dreaming.After the volunteers had experienced between two and three minutes of REM sleep, the scientists applied tACS, or a "sham" procedure that produced no current, for around 30 seconds.The volunteers were tested at frequencies of two herz (Hz), six Hz, 12 Hz, 25 Hz, 60 Hz and 100 Hz.Voss said, though, that it seemed inevitable that a similar device would one day be invented for consumers, enabling sleepers to latch onto lucid dreaming, for better or worse.
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