Violent Video Games May Numb Players to Brutality, Study Finds

THURSDAY, May 9 (HealthDay News) -- Teenage boys who play violent video games for hours on end may become desensitized to the brutality, a small new study finds.

The research focused on 30 boys, aged 13 to 15, who were divided into two groups. One group typically played violent video games for three or more hours a day (high exposure) while the other group played such games for no more than an hour a day (low exposure).

The researchers monitored the boys' reactions after playing a violent game ("Manhunt") and a nonviolent cartoon game ("Animaniacs"). They played each game for two hours on different evenings.

Differences between the boys' reactions emerged later in the night after gaming. During sleep, the boys in the low-exposure group who played the violent game had faster heart rates and poorer quality of sleep than those in the high-exposure group. The boys in the low-exposure group also reported increased feelings of sadness after playing the violent game.

Both groups of boys had higher stress and anxiety levels after playing the violent game, according to the study, which was published in the May issue of Psychosomatic Medicine: Journal of Biobehavioral Medicine.

"The violent game seems to have elicited more stress at bedtime in both groups, and it also seems as if the violent game in general caused some kind of exhaustion," wrote Malena Ivarsson, of the Stress Research Institute at Stockholm University in Sweden, and colleagues. "However, the exhaustion didn't seem to be of the kind that normally promotes good sleep, but rather as a stressful factor that can impair sleep quality."

The differences between the two groups' physical and mental responses suggest that frequent exposure to violent video games may have a desensitizing effect, the researchers said. The study, however, didn't prove a cause-and-effect relationship, and it's possible that boys with certain traits may be attracted to violent games, the researchers said.

-- Robert Preidt
Copyright © 2013 HealthDay. All rights reserved. SOURCE; Psychosomatic Medicine: Journal of Biobehavioral Medicine, news release, May 3, 2013

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'Violent Behavior' Occurs in Many Adult Sleepwalkers, Study Finds

Those with disorder risk injury, fatigue and other health problems, researchers report

By Kathleen Doheny

HealthDay Reporter

FRIDAY, March 8 (HealthDay News) -- Adults don't always outgrow sleepwalking, and among those who don't, 58 percent may become violent and sometimes injure either themselves or their sleeping partner, a new study shows.

Not only that, these sleepwalkers suffer a host of health problems during their waking hours, the researchers noted.

"Daytime sleepiness is a frequent problem in adults affected with sleepwalking," said study author Dr. Yves Dauvilliers, director of the sleep lab at Gui-de-Chauliac Hospital in Montpelier, France.

That's among the more obvious problems, he said. They also may experience depression, anxiety and lower quality of life.

Injuries, both to sleepwalkers and their bed partners, happen 17 percent of the time, Dauvilliers said. "Some patients have jumped out of windows," he said. "Some have walked on the house roof. And others fell down the stairs, with legs broken."

The study is published in the March issue of the journal Sleep.

For the research, Dauvilliers evaluated 100 adult sleepwalkers who came to the hospital sleep disorders clinic. The median age was 30. They were all evaluated on video one night in the sleep lab. The patients answered questions about any problems with sleep, fatigue, anxiety, depression and overall quality of life.

The patients also divulged details on possible known triggers for sleepwalking, such as stress, strong emotions, drinking alcohol or engaging in intense physical activity in the evening.

The researchers also interviewed 100 healthy people who did not sleepwalk and compared the results.

Of the sleepwalkers, nearly 23 percent did so nightly and 43.5 percent did it weekly. The median age for starting the habit was 9 years. More than half reported a family history of sleepwalking.

Compared to those who didn't sleepwalk, the sleepwalkers were more likely to have daytime sleepiness, fatigue, insomnia, symptoms of anxiety and depression, and to feel their quality of life was lower.

In 17 percent of patients who became violent while asleep, medical care was needed for at least one episode of such behavior. The researchers defined violent behavior as "physically aggressive or potentially dangerous behaviors for patients and co-sleepers." They noted that for six patients (five males), a bed partner needed medical care after being attacked.

The findings are not a surprise to Dr. Maurice Ohayon, a professor of psychiatry and behavioral sciences at Stanford University, who has published his own studies on sleepwalking. In his research, he has found that about 4 percent of the adult population sleepwalks.

The sleepwalkers studied by Dauvilliers, he said, are more severe cases than he found in his look at the general population. The study patients had been referred to a sleep clinic. Even so, he said he found some of the same issues with the sleepwalkers he studied. They often had a family history of the problem, and they reported depression and the need for sleeping pills due to insomnia.

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