Professor Basner says the hearing system serves as a watchdog. 'It never closes, keep watch over for potential threats.'
The brain not only evaluates the level of sound, but also the content of the sound. According to a 1960 study, scientists gave names to study subjects while they slept.
If the name of the object or loved one is raised, the person is more likely to be awakened than the names of the strangers.
"The influencing factor here is that the sound is played when you go to sleep or sleep," Basner said.
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