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Washington D.C. [USA], April 7 : In a recent study conducted on college students, researchers found that students who listened to classical music by Beethoven and Chopin during a computer-interactive lecture on microeconomics and heard the music played again that night did better on a test the next day than did peers who were in the same lecture, but instead slept that evening with white noise in the background.Over the long haul when students took a similar test nine months later the boost did not last. Scores dropped to floor levels, with everyone failing and performance averaging less than 25 per cent for both groups. However, targeted memory reactivation (TMR) may aid during deep sleep, when memories are theorized to be reactivated and moved from temporary storage in one part of the brain to more permanent storage in other parts, researchers said.The study is published in the journal Neurobiology of Learning and Memory."All educators want to teach students how to integrate concepts, not just memorize details, but that's notoriously difficult to do," said Michael K. Scullin, Ph.D., director of Baylor's sleep lab and assistant professor of psychology and neuroscience. "What we found was that by experimentally priming these concepts during sleep, we increased performance on integration questions by 18% on the test the next day. What student wouldn't want a boost or two to their letter grade? The effects were particularly enhanced in participants who showed heightened frontal lobe activity in the brain during slow-wave sleep, which is deep sleep."He noted that the effects emerged when using gold-standard procedures: neither participants nor experimenters knew who received a particular treatment, sleep was measured using EEG in a laboratory setting, and the learning materials matched those that would actually be used in a college classroom, in this case, an undergraduate microeconomics lecture.Poor sleep is widespread in college students, with 60 per cent habitually sleeping fewer than the recommended seven hours on 50 to 65 per cent of nights. While students may be more concerned about immediate test results -- and TMR may help them cram for an exam -- learning by rote (item memory) does not normally benefit grasping and retaining a concept.For the study, researchers recruited 50 college students ages 18 to 33 for a learning task with a self-paced, computer-interactive lecture; and for two overnight polysomnography sessions, with the first night an adaptation to the lab and screening for sleep disorders, and the second did the evening of the lecture.During the lecture, soft background selections were played from a computer: the first movement of Beethoven's "Moonlight" Piano Sonata, the first movement of Vivaldi's "Spring" Violin Concerto and Chopin's Nocturne in E-flat major, Op. 9, No. 2.That night in Baylor's sleep lab, research personnel applied electrodes and used computers to monitor sleep patterns of both test and control groups. Once technicians observed a person was in deep sleep, they played either the classical music or the white noise -- depending on whether the individual was in the test or control group -- for about 15 minutes."Deep slow-wave sleep won't last super long before shifting back to light sleep, so we couldn't play them endlessly," Scullin said. "If we played it during light sleep, the music probably would have awoken participants. The first slow-wave cycle is the deepest and longest."The music choice was important, researchers said."We ruled out jazz because it's too sporadic and would probably cause people to wake," Scullin said. "We ruled out popular music because lyrical music disrupts initial studying. You can't read words and sing lyrics -- just try it. We also ruled out ocean waves and ambient music because it's very easy to ignore. You're going to have a heck of time forming a strong association between some learning material and a bland song or ambient noise."That left us with classical music, which many students already listen to while studying," he said. "The songs can be very distinctive and therefore pair well with learning material."In the microeconomics exam the next day, the TMR of classical music more than doubled the likelihood of passing the test when compared with the control condition of white noise.( With inputs from ANI )

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