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Research at Mass General
A monthly column about recent research news from Massachusetts General Hospital. This month: Mapping the wandering mind, oxytocin and weight loss, and how the brains of marijuana users react to social isolation.
Do you ever find your mind wandering? You are not alone. Studies show that we spend 30 to 50 percent of our waking hours unfocused on the task at hand. But why?
Researchers at the MGH’s Martinos Center for Biomedical Imaging used functional MRI (fMRI) technology to identify changes in brain activity that take place between focused and unfocused states of mind.
Learning more about the dynamics of attention shifts could eventually help scientists answer questions such as: “How do thought patterns emerge?” and “How do people make decisions on a day-to-day basis?”
A new Mass General research study found that the brains of young adult marijuana users react differently to experiences of social exclusion than those of non-users.
Using a computer simulation that mimics playing a game of catch with two other people, researchers found that the area of the brain that typically activates during social rejection reacted less in marijuana users than in non-users when they were excluded from the game.
More research is now needed to determine if this change in brain state results in real-life changes in social behavior.
A team of researchers at the Mass General Center for Regenerative Medicine have grown functional heart tissue using donated human hearts that have been stripped of their cells.
While growing an entire human heart is still far off, the scientists said tissue grown from a patient’s own cells may lead to patches to replace cardiac tissue damaged during a heart attack.
Researchers at Mass General are investigating whether doses of synthetic oxytocin — a hormone produced naturally in the brain — could help to curb obesity by improving self-control.
A recent study showed that a group of overweight/obese male subjects who took a nasal spray of oxytocin prior to playing a computer game had more control over their behavior and acted less impulsively. A previous study determined that a dose of oxytocin spray could reduce food and fat intake without affecting appetite, but researchers were not able to determine why the spray had this effect. More research is now needed to confirm these results in female subjects.
Physicians at the Fireman Vascular Center are now offering transcarotid artery revascularization (TCAR), a new and less invasive treatment for carotid artery disease.
The new process, which was tested in a worldwide clinical trial led in the United States by two Mass General physicians, involves accessing the common carotid artery through a small incision above the collarbone.
This reduces the risk of suffering a stroke during the procedure and other complications associated with more conventional surgical approaches. Mass General was the first hospital in the Boston area to offer this procedure.
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