When we dream, something mysterious happens within our brains – we experience something similar to being awake, and yet also very different to being awake, and scientists are still trying to unpick exactly what's going on in that in-between state.
When we dream, something mysterious happens within our brains – we experience something similar to being awake, andconsciousness
Mapping the brains of living people while both awake and asleep isn't easy – few of us would want electrodes implanted in our skulls during our day-to-day activities – but here the team took advantage of medical research being carried out on epilepsy patients. The electrodes enabled the researchers to see the differences in the response of the cerebral cortex when patients were in different stages of sleep compared to when they were awake – right down to individual neurons.For the purposes of the study, the researchers played a variety of sounds through speakers at the bedsides of the volunteers. Data on over 700 neurons were collected across the course of eight years.
This goes against previous thinking: that during sleep, sound-related signals quickly decay in the brain. In fact, they stay stronger and richer than we thought, it's just that there's one significant difference in the way they're processed while we're snoozing.
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