Sleep twitches light up the brain
A University of Iowa study has found twitches made during sleep activate the brains of mammals differently than movements made while awake.
Researchers say the findings show twitches during rapid eye movement (REM) sleep comprise a different class of movement and provide further evidence that sleep twitches activate circuits throughout the developing brain. In this way, twitches teach newborns about their limbs and what they can do with them.
Mark Blumberg, a psychology professor at the UI and senior author of the study, says this latest discovery is further evidence that sleep twitches— whether in dogs, cats or humans—are connected to brain development, not dreams.
“Because twitches are so different from wake movements,” he says, “these data put another nail in the coffin of the ‘chasing rabbits’ interpretation of twitches.”
For this study, Blumberg, Tiriac and fellow graduate student Carlos Del Rio-Bermudez studied the brain activity of unanesthetized rats between 8 and 10 days of age. They measured the brain activity while the animals were awake and moving and again while the rats were in REM sleep and twitching.
What they discovered was puzzling, at first.
“We noticed there was a lot of brain activity during sleep movements but not when these animals were awake and moving,” Tiriac says.
The researchers theorized that sensations coming back from twitching limbs during REM sleep were being processed differently in the brain than awake movements because they lacked what is known as “corollary discharge.”
First introduced by researchers in 1950, corollary discharge is a split-second message sent to the brain that allows animals—including rats, crickets, humans and more—to recognize and filter out sensations generated from their own actions. This filtering of sensations is what allows animals to distinguish between sensations arising from their own movements and those from stimuli in the outside world.
So, when the UI researchers noticed an increase in brain activity while the newborn rats were twitching during REM sleep but not when the animals were awake and moving, they conducted several follow-up experiments to determine whether sleep twitching is a unique self-generated movement that is processed as if it lacks corollary discharge.
The experiments were consistent in supporting the idea that sensations arising from twitches are not filtered: And without the filtering provided by corollary discharge, the sensations generated by twitching limbs are free to activate the brain and teach the newborn brain about the structure and function of the limbs.
“If twitches were like wake movements, the signals arising from twitching limbs would be filtered out,” Blumberg says. “That they are not filtered out suggests again that twitches are special—perhaps special because they are needed to activate developing brain circuits.”
The UI researchers were initially surprised to find the filtering system functioning so early in development.
“But what surprised us even more,” Blumberg says, “was that corollary discharge appears to be suspended during sleep in association with twitching, a possibility that – to our knowledge – has never before been entertained.”
Alle Nachrichten aus der Kategorie: Life Sciences
Articles and reports from the Life Sciences area deal with applied and basic research into modern biology, chemistry and human medicine.
Valuable information can be found on a range of life sciences fields including bacteriology, biochemistry, bionics, bioinformatics, biophysics, biotechnology, genetics, geobotany, human biology, marine biology, microbiology, molecular biology, cellular biology, zoology, bioinorganic chemistry, microchemistry and environmental chemistry.
2020 Arctic sea ice minimum at second lowest on record
NASA and the National Snow and Ice Data Center (NSIDC) at the University of Colorado Boulder shows that the 2020 minimum extent, which was likely reached on Sept. 15, measured…
Dresden physicists develop printable organic transistors
Scientists at the Institute of Applied Physics at TU Dresden have come a step closer to the vision of a broad application of flexible, printable electronics. The team around Dr…
Researchers discover a mechanism that causes cell nuclei to grow
By far the most important process in cell development is how cells divide and then enlarge in order to multiply. A research team headed by Freiburg medical scientist Prof. Dr….