In the following passage, some of the words have been left out. Read the passage carefully and select the correct answer for the given blanks out of the given alternatives.

At a sleep research ___(1)___ in January 2020, Janna Lendner presented findings that hint at a way to look at people’s brain activity for signs of the boundary between wakefulness and unconsciousness. For patients who are ___(2)___ or under anaesthesia, it can be all-important that physicians make that distinction correctly. Doing so is trickier than it might sound, however, because when someone is in the dreaming state of rapid-eye-movement (REM) sleep, their brain produces the same familiar, smoothly ___(3)___ brain waves as when they are awake. Lendner argued, though, that the answer isn’t in the regular brain waves, but rather in an aspect of neural activity that scientists might normally ignore: the erratic background noise. Some researchers seemed ___(4)___. “They said, ‘So, you’re telling me that there’s, like, information in the noise?’” said Lendner, an anesthesiology resident at the University Medical Center in Tübingen, Germany, who recently completed a postdoc at the University of California, Berkeley. “I said, ‘Yes. Someone’s noise is another one’s signal.’ Lendner is one of a growing number of neuroscientists ___(5)___ by the idea that noise in the brain’s electrical activity could hold new clues to its inner workings. What was once seen as the neurological equivalent of annoying television static may have profound implications for how scientists study the brain.