Sleep is crucial to our ability to make connections from information we pick up during the day, according to a computer model of two areas of the brain.
Maxim Bazhenov, PhD, one of the researchers, explained that the indirect links occur because the neurons related to A, B, and C all fire in close order, called sleep replay, which creates a connection between all three neurons.
"Therefore, after sleep, activating any one group, such as A, activated all other related groups, such as B and C," he said in aThe thalamus is the part of the brain that picks up on sensory cues and makes sense of them, and the cortex is essential for memory, learning, and decision-making. Our neurons are taking in sensory input when awake, but it's during deep sleep that the cortex makes sense of the day's input.
Sleep replay triggers synaptic plasticity, the activity among neurons that allows them to communicate with one another and the primary way the brain creates, changes, or deletes memories. The computer-based model mainly helped the researchers understand how relational memory in the brain works – how the brain connects seemingly unrelated pieces of information.
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