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Gender differences in language appear biological

Public HealthMar 03 08

Although researchers have long agreed that girls have superior language abilities than boys, until now no one has clearly provided a biological basis that may account for their differences.

For the first time—and in unambiguous findings—researchers from Northwestern University and the University of Haifa show both that areas of the brain associated with language work harder in girls than in boys during language tasks, and that boys and girls rely on different parts of the brain when performing these tasks.

“Our findings – which suggest that language processing is more sensory in boys and more abstract in girls—could have major implications for teaching children and even provide support for advocates of single sex classrooms,” said Douglas D. Burman, research associate in Northwestern’s Roxelyn and Richard Pepper Department of Communication Sciences and Disorders.

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Psychological Distress, Not Depression, Linked to Increased Risk of Stroke

Stress • • StrokeMar 03 08

Psychological distress, but not depression, may increase the risk of stroke, according to a study published in the March 4, 2008, issue of Neurology®, the medical journal of the American Academy of Neurology. Previous studies have shown that stroke often leads to depression, but the evidence was mixed as to whether depression could lead to stroke.

“Stroke is among the leading causes of long-term disability and death worldwide,” said study author Paul Surtees, PhD, of the University of Cambridge in the United Kingdom. “Understanding the mechanisms by which overall emotional health may increase stroke risk may inform stroke prevention and help identify those at increased stroke risk.”

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Methylphenidate can have sleep benefits in adults with ADHD

Children's Health • • Sleep AidMar 02 08

Treatment with methylphenidate (MPH) appears to have beneficial effects on sleep parameters in adults with ADHD, including increased sleep efficiency and a feeling of improved restorative value of sleep, according to a study published in the March 1 issue of the journal SLEEP.

The study, authored by Esther Sobanski, MD, of the Central Institute of Mental Health in Mannheim, Germany, focused on 34 non-medicated patients with ADHD, of whom 24 were without current psychiatric disorders, and 34 control subjects without current psychiatric disorders or psychotropic medication. Compared to the control group, all subjects in the ADHD sample displayed reduced sleep efficiency, with longer sleep onset latency and more nocturnal awakenings. They had altered sleep architecture, with a higher percentage of stage 1 and reduced percentage of REM sleep. Patients also showed a trend toward the reduced total REM density and elevated percentage of wakefulness after sleep onset.

According to Dr. Sobanski, this study showed that objective and subjective sleep problems in adults with ADHD are identical with sleep problems in children with ADHD, including longer sleep latencies, more nocturnal activity, reduced sleep efficiency, more nocturnal awakenings and slightly decreased REM activity during sleep, although the clinical significance of the last findings remains to be clarified.

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Increased Allergen Levels in Homes Linked to Asthma

Allergies • • AsthmaMar 02 08

Results from a new national survey demonstrate that elevated allergen levels in the home are associated with asthma symptoms in allergic individuals. The study suggests that asthmatics that have allergies may alleviate symptoms by reducing allergen exposures inside their homes. The work was carried out by researchers at the National Institute of Environmental Health Sciences (NIEHS), the University of Iowa, Rho Inc., and the Constella Group. The team’s findings may help millions of Americans who suffer from asthma.

“Indoor allergen exposures are of great importance in relation to asthma because most people spend a majority of their time indoors, especially at home,” said Darryl Zeldin, M.D., a Principal Investigator in the Laboratory of Respiratory Biology at NIEHS and senior author on the paper.

Asthma is one of the most common chronic ailments in the United States, affecting more than 22 million people. Asthma has been shown to be triggered by a wide range of substances called allergens.

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