A closer look at the sleeping brain
UCLA researchers have successfully measured the activity of a brain region known to be involved in learning, memory and Alzheimer's disease during sleep.
Interestingly, this particular part of the brain behaves as if it's remembering something - even under anesthesia - a finding that counters previous conventional theories about memory consolidation during sleep.
According to Dr. Mayank R. Mehta, the research team simultaneously measured the activity of single neurons from multiple parts of the brain involved in memory formation. Essentially, this technique allowed them to determine which brain region was activating other areas of the brain and how that activation was spreading.
Specifically, the scientists analyzed three connected brain regions in mice - the new brain or the neocortex, the old brain or the hippocampus, and the entorhinal cortex, an intermediate brain that connects the new and the old brains.
While previous studies have hypothesized that the dialogue between the old and the new brain during sleep was critical for memory formation, researchers had not investigated the contribution of the entorhinal cortex to this conversation, which turned out to be a game changer.
Indeed, Mehta’s team found that the entorhinal cortex showed what is called persistent activity, which is thought to mediate working memory during waking life; for example when people pay close attention to remember things temporarily, such as recalling a phone number or following directions.
"The big surprise here is that this kind of persistent activity is happening during sleep, pretty much all the time," Mehta explained. "These results are entirely novel and surprising. In fact, this working memory-like persistent activity occurred in the entorhinal cortex even under anesthesia."
As Mehta notes, the findings are important because humans spend one-third of their lives sleeping - and a lack of sleep results in adverse effects on health, including learning and memory problems. It had been previously theorized that the neocortex and the hippocampus "talk" to each other during sleep - and it is believed that this conversation plays a critical role in establishing memories, or memory consolidation. However, no one was able to interpret the conversation - up until now.
"When you go to sleep, you can make the room dark and quiet and although there is no sensory input, the brain is still very active," Mehta said. "We wanted to know why this was happening and what different parts of the brain were saying to each other."
As such, Mehta and his team developed an extremely sensitive monitoring system that allowed them to follow the activities of neurons from each of three targeted portions of the brain simultaneously, including the activity of a single neuron. This allowed them to decipher the precise communications, even when the neurons were seemingly quiet. They then developed a sophisticated mathematical analysis to decipher the complex conversation.
During sleep, the neocortex goes into a slow wave pattern for about 90 percent of that time. During this period, its activity slowly fluctuates between active and inactive states about once every second. Mehta and his team focused on the entorhinal cortex, which has many parts.
The outer part of the entorhinal cortex mirrored the neocortical activity. However, the inner part behaved differently. When the neocortex became inactive, the neurons in the inner entorhinal cortex persisted in the active state, as if they were remembering something the neocortex had recently "said," a phenomenon called spontaneous persistent activity.
In addition, they discovered that when the inner part of the entorhinal cortex became spontaneously persistent, it prompted the hippocampus neurons to become very active. On the other hand, when the neocortex was active, the hippocampus became quieter. This data provided a clear interpretation of the conversation.
"During sleep the three parts of the brain are talking to each other in a very complex way," he explained. "The entorhinal neurons showed persistent activity, behaving as if they were remembering something even under anesthesia when the mice could not feel or smell or hear anything. Remarkably, this persistent activity sometimes lasted for more than a minute, a huge timescale in brain activity, which generally changes on a scale of one thousandth of a second."
The above-mentioned findings challenge theories of brain communication during sleep, in which the hippocampus is expected to talk to, or drive, the neocortex. Mehta's conlcusions indicate that there is in fact a third key actor in this complex dialogue, the entorhinal cortex, and that the neocortex is driving the entorhinal cortex, which in turn behaves as if it is remembering something. That, in turn, drives the hippocampus, while other activity patterns shut it down.
"This is a whole new way of thinking about memory consolidation theory. We found there is a new player involved in this process and it's having an enormous impact," Mehta stated. "And what that third player is doing is being driven by the neocortex, not the hippocampus. This suggests that whatever is happening during sleep is not happening the way we thought it was. There are more players involved so the dialogue is far more complex, and the direction of the communication is the opposite of what was thought."
Mehta theorizes that this process occurs during sleep as a way to unclutter memories and delete information that was processed during the day but is irrelevant. This results in the important memories becoming more salient and readily accessible. Most notably, Alzheimer's disease starts in the entorhinal cortex and patients have impaired sleep, so Mehta's findings may have far-reaching implications.