Using an innovative technology called NeuroGrid, scientists have shown that sleep boosts communication between two brain regions whose connection is critical for the formation of memories.
"Using new technologies advanced by the BRAIN Initiative, these researchers made a fundamental discovery about how the brain creates and stores new memories," said Nick Langhals, Ph.D., program director at NIH's National Institute of Neurological Disorders and Stroke.
The region known as the hippocampus has been widely thought to turn new information into permanent memories while we sleep. Previous work by the senior author of the study, György Buzsáki, M.D., Ph.D., and York University professor, showed that high-frequency bursts of neural firing called ripples in the hippocampus during sleep and suggested they play a role in the memory storage. The current study confirmed the presence of ripples in the hippocampus during sleep. It also found them in certain parts of association neocortex and is on the brain’s surface involved in processing complex sensory information.
"When we first observed this, we thought it was incorrect because it had never been observed before," said Dion Khodagholy, Ph.D., the study's co-first author and assistant professor at Columbia University in New York.
Using the newly invented NeuroGrid system, along with recording electrodes placed deeper into the brain, the researchers examined activity in several parts of rat brains during non-rapid eye movement (NREM) sleep, which is the longest stage of sleep. Their NeuroGrid consists of a collection of tiny electrodes linked together like the threads of a blanket, which is then laid across an area of the brain so that each electrode can continuously monitor the activity of a different set of neurons.
"This particular device allows us to look at multiple areas of the brain at the same time," said Jennifer Gelinas, M.D., Ph.D., the study's co-first author and assistant professor at Columbia University.
The team was surprised to find that the ripples in the association neocortex and hippocampus occurred at the same time. This suggests that the two regions were communicating as the rats slept. Because the association neocortex is thought to be a storage location for memories, the researchers theorized that this neural dialogue could help the brain retain information.
To test this idea, researchers examined brain activity during NREM sleep in rats that were trained to locate rewards in a maze and in rats that explored the maze in a random fashion. In the latter group of animals, the ripples in the hippocampus and cortex were no more synchronized before exploring the maze than after exploring the maze. In trained rats, the learning task increased the cross-talk between those areas. A second training session boosted it even more. This suggests that this communication is important for the creation and storage of memories.
The group hopes to use the NeuroGrid in people undergoing brain surgery for other reasons to determine if the same ripples occur in the human brain. The researchers want to investigate if manipulating the neural firing in animals can boost or suppress memory formation in order to confirm that ripples are important to the process.
"Identifying the specific neural patterns that go along with memory formation provides a way to better understand memory and potentially even address disorders of memory," said Dr. Gelinas.
The paper on this research was published in Science.