Viva La Siesta!: A Nap Significantly Boosts the Brain’s Learning Capacity
BERKELEY — If you see a student dozing in the library or a co-worker catching 40 winks in her cubicle, don’t roll your eyes. New research from the University of California, Berkeley, shows that an hour’s nap can dramatically boost and restore your brain power. Indeed, the findings suggest that a biphasic sleep schedule not only refreshes the mind, but can make you smarter.
Conversely, the more hours we spend awake, the more sluggish our minds become, according to the findings. The results support previous data from the same research team that pulling an all-nighter — a common practice at college during midterms and finals — decreases the ability to cram in new facts by nearly 40 percent, due to a shutdown of brain regions during sleep deprivation.
“Sleep not only rights the wrong of prolonged wakefulness but, at a neurocognitive level, it moves you beyond where you were before you took a nap,” said Matthew Walker, an assistant professor of psychology at UC Berkeley and the lead investigator of these studies.
In the recent UC Berkeley sleep study, 39 healthy young adults were divided into two groups — nap and no-nap. At noon, all the participants were subjected to a rigorous learning task intended to tax the hippocampus, a region of the brain that helps store fact-based memories. Both groups performed at comparable levels.
At 2 p.m., the nap group took a 90-minute siesta while the no-nap group stayed awake. Later that day, at 6 p.m., participants performed a new round of learning exercises. Those who remained awake throughout the day became worse at learning. In contrast, those who napped did markedly better and actually improved in their capacity to learn.
Matthew Walker, assistant psychology professor, has found that a nap clears the brain to absorb new information.
These findings reinforce the researchers’ hypothesis that sleep is needed to clear the brain’s shor
t-term memory storage and make room for new information, said Walker, who presented his preliminary findings on Sunday, Feb. 21, at the annual meeting of the American Association of the Advancement of Science (AAAS) in San Diego, Calif.
Since 2007, Walker and other sleep researchers have established that fact-based memories are temporarily stored in the hippocampus before being sent to the brain’s prefrontal cortex, which may have more storage space.
“It’s as though the e-mail inbox in your hippocampus is full and, until you sleep and clear out those fact e-mails, you’re not going to receive any more mail. It’s just going to bounce until you sleep and move it into another folder,” Walker said.
In the late
st study, Walker and his team have broken new ground in discovering that this memory-refreshing process occurs when nappers are engaged in a specific stage of sleep. Electroencephalogram tests, which measure electrical activity in the brain, indicated that this refreshing of memory capacity is related to Stage 2 non-REM sleep, which takes place between deep sleep (non-REM) and the dream state known as Rapid Eye Movement (REM). Previously, the purpose of this stage was unclear, but the new results offer evidence as to why humans spend at least half their sleeping hours in Stage 2, non-REM, Walker said.
“I can’t imagine Mother Nature would have us spend 50 percent of the night going from one sleep stage to another for no reason,” Walker said. “Sleep is sophisticated. It acts locally to give us what we need.”
Walker and his team will go on to investigate whether the reduction of sleep experienced by people as they get older is related to the documented decrease in our ability to learn as we age. Finding that link may be helpful in understanding such neurodegenerative conditions as Alzheimer’s disease, Walker said.
In addition to Walker, co-investigators of these new findings are Bryce A. Mander and psychology undergraduate Sangeetha Santhanam.
Source: University of California, Berkeley http://www.berkeley.eduRelated articles
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Asperger’s, PDD-NOS may no longer receive separate diagnoses in DSM-V
Recently, the American Psychiatric Association released some preliminary draft changes to the Diagnostic and
Statistical Manual of Mental Disorders (DSM-V) that may affect those diagnosed on the autism spectrum. There are several significant changes proposed that are now posted for public view, including: Asperger’s Syndrome and Pervasive Developmental Disorder-Not Otherwise Specified (PDD-NOS) would both be subsumed into the Autistic Disorder category, meaning that they would no longer be considered a separate diagnosis from autism, and the inclusion of potential co-morbidities with ADHD and other medical conditions.
The Autism Society is currently investigating the implications this change could have for the service and support systems currently in place for those with autism spectrum disorders. We will also be holding a town hall meeting at the Autism Society’s National Conference on Autism Spectrum Disorders in Dallas July 7–10, 2010 (learn more about the conference or register at www.autism-society.org/conference). You can also give your feedback on the changes at the Web site www.DSM5.org – look for the diagnoses on the autism spectrum under “Disorders Usually First Diagnosed in Infancy, Childhood, or Adolescence.”
These changes are not yet official – they are proposed for the update to the manual, which is expected to be published in May 2013. Whatever changes do go into effect surrounding autism spectrum disorders, the Autism Society will continue to work as we have always done to improve the lives of people across the entire spectrum of autism.
Source: autism-society.orgWatch What They’re Watching:Children Viewing Adult-targeted TV May Become Sexually Active Earlier In Life
Early onset of sexual activity among teens may relate to the amount of adult content children were exposed to during their childhood, according to a new study released by Children’s Hospital Boston. Based on a longitudinal study tracking children from age six to eighteen, researchers found that the younger children are exposed to content intended for adults in television and movies, the earlier they become sexually active during adolescence. The findings are being presented at the Pediatric Academic Societies meetings on Monday, May 4 in Baltimore.
“Television and movies are among the leading sources of information about sex and relationships for adolescents,” says Hernan Delgado, MD, fellow in the Division of Adolescent/Young Adult Medicine at Children’s Hospital Boston and lead author of the study. “Our research shows that their sexual attitudes and expectations are influenced much earlier in life.”
The study consisted of 754 participants, 365 males and 389 females, who were tracked during two stages in life: first during childhood, and again five years later when their ages ranged from 12 to 18-years-old. At each stage, the television programs and movies viewed, and the amount of time spent watching them over a sample weekday and weekend day were logged. The program titles were used to determine what content was intended for adults. The participants’ onset of sexual activity was then tracked during the second stage.
According to the findings, when the youngest children in the sample–ages 6 to 8-years-old–were exposed to adult-targeted television and movies, they were more likely to have sex earlier when compared those who watched less adult-targeted content. The study found that for every hour the youngest group of children watched adult-targeted content over the two sample days, their chances of having sex during early adolescence increased by 33 percent. Meanwhile, the reverse was not found to be true that is, becoming sexually active in adolescence did not subsequently increase youth’s viewing of adult-targeted television and movies.
“Adult entertainment often deals with issues and challenges that adults face, including the complexities of sexual relationships. Children have neither the life experience nor the brain development to fully differentiate between a reality they are moving toward and a fiction meant solely to entertain,” adds David Bickham, PhD, staff scientist in the Center on Media and Child Health and co-author of the study. “Children learn from media, and when they watch media with sexual references and innuendos, our research suggests they are more likely to engage in sexual activity earlier in life.”
The researchers encourage parents to follow current American Academy of Pediatrics viewing guidelines such as no television in the bedroom, no more than 1 to 2 hours of screen time a day, and to co-view television programs and have an open dialogue about its content with your children. They also suggest that–while the results demonstrate a longitudinal relationship–more research needs be done to understand how media influences children’s growing awareness of human relationships and sexual behavior.
“Adolescent sexual behaviors may be influenced at a younger age, but this is just one area we studied,” adds Dr. Delgado. “We showed how adult media impacts children into adolescence, yet there are a number of other themes in adult television shows and movies, like violence and language, whose influence also needs to be tracked from childhood to adolescence.”
The study was funded by support by grants from the Maternal and Child Health Bureau and the Center on Media and Child Health.
Children’s Hospital Boston is home to the world’s largest research enterprise based at a pediatric medical center, where its discoveries have benefited both children and adults since 1869. More than 500 scientists, including eight members of the National Academy of Sciences, 11 members of the Institute of Medicine and 13 members of the Howard Hughes Medical Institute comprise Children’s research community. Founded as a 20-bed hospital for children, Children’s Hospital Boston today is a 397-bed comprehensive center for pediatric and adolescent health care grounded in the values of excellence in patient care and sensitivity to the complex needs and diversity of children and families. Children’s also is the primary pediatric teaching affiliate of Harvard Medical School.
Source: MedicalNewsToday.com, Children’s Hospital Boston





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