![]() Greater time distortions correlated with greater reductions in activity in the supramarginal gyrus. People who saw the initial series of circles for 250 milliseconds each time overestimated how long the final circle appeared. Then, a final circle flashed on the screen. For some participants, the circle appeared for just 250 milliseconds, and for others, it stuck around a little longer: 750 milliseconds. For the new study, the researchers scanned people’s brains as they watched a gray circle flash repeatedly on a screen for the same length of time. Previous studies demonstrated damage to this region, called the supramarginal gyrus, impaired people’s ability to perceive time. When neurons in a certain region of the brain become fatigued, we may perceive time as moving faster or slower, researchers reported September 14 in JNeurosci. Read more: Researchers Say the Purpose of Sleep Shifts During the ‘Terrible Twos’ (Smithsonian) Fatigued Neurons Skew Our Perception of Time At this point, children begin to spend more time in non-REM sleep, the stage where the brain prioritizes repair and maintenance. But REM sleep declined sharply around age two and a half. ![]() Infants spent a larger percentage of time in REM sleep – the stage of sleep where dreaming occurs and where scientists think most memory consolidation takes place – than children and adults. As reported September 18 in Science Advances, the team compiled datasets from more than 60 studies and developed a mathematical model that could explain how sleep changes over the lifespan. Now, a team of researchers has found sleep’s primary function changes as we develop, showing an abrupt shift when children are about two and a half years old. Sleep helps us reorganize neural circuits to consolidate memories, repair cells, and flush out metabolic waste. Read more: Scientists Say A Mind-Bending Rhythm In The Brain Can Act Like Ketamine (NPR) Sleep Patterns Show an Abrupt Shift Around Age 2 When monitoring a patient with epilepsy who experienced dissociation, the researchers observed a pattern of electrical activity in the posteromedial cortex that was similar to that found in the mouse brains. What’s more, the mice behaved as though they were on ketamine. ![]() Using optogenetics, the researchers activated neurons in the retrosplenial cortex where the same brain rhythms emerged. The cells fired three times per second and were out of sync with most parts of the brain. In mice, ketamine triggered unique oscillations in electrical activity in the retrosplenial cortex, an area involved in memory and navigation. The dissociative experience arises from an aberrant brain rhythm, researchers reported September 16 in Nature. The drug ketamine can disconnect people from their thoughts, body, and surroundings. These were the top neuroscience stories for the week of September 14, 2020.
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