Most animals, from flies to humans, have trouble remembering when sleep deprived, and studies have shown that sleep is critical in converting short-term into long-term memory, a process known as memory consolidation.
The question is, does the mechanism that promotes sleep also consolidate memory, or do two distinct processes work together?
In other words, is memory consolidated during sleep because the brain is quiet, allowing memory neurons to go to work, or are memory neurons actually putting us to sleep?
New research suggest the latter, with graduate students Paula Haynes and Bethany Christmann discussing their findings in the journal eLife.
Haynes and Christmann focused their research on dorsal paired medial (DPM) neurons, well-known memory consolidators in the Drosophila fruit fly. They observed, for the first time, that when DPM neurons are activated, the flies slept more; when deactivated, the flies kept buzzing.
These memory consolidators inhibit wakefulness as they start converting short-term to long-term memory. All this takes place in a section of the Drosophila brain called the mushroom body, similar to the hippocampus, where our memories are stored.
As it turns out, the parts of the mushroom body responsible for memory and learning also help keep the Drosophila awake.
“It’s almost as if that section of the mushroom body were saying ‘hey, stay awake and learn this,'” said Christmann. “Then, after a while, the DPM neurons start signaling to suppress that section, as if to say ‘you’re going to need sleep if you want to remember this later.'”
Understanding how sleep and memory are connected in a simple system, like Drosophila, can help scientists unravel the secrets of the human brain.
“Knowing that sleep and memory overlap in the fly brain can allow researchers to narrow their search in humans,” Christmann said.
“Eventually, it could help us figure out how sleep or memory is affected when things go wrong, as in the case of insomnia or memory disorders.”
Source: Brandeis University