A sleeping brain can form fresh memories, according to a team of neuroscientists. The researchers played complex sounds to people while they were sleeping, and afterward the sleepers could recognise those sounds when they were awake. The idea that humans can learn while asleep, a concept sometimes called hypnopaedia, has a long and odd history. It hit a particularly strange note in 1927, when New York inventor A. B. Saliger debuted the Psycho-phone. He billed the device as an "automatic suggestion machine."
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