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In a first, a computer enables quadriplegic to move simple devices By Steven Reinberg HealthDay Reporter Updated: 4/26/2007 3:31:19 PM Print Article Email Article laptop battery

WEDNESDAY, July 12 (HealthDay News) -- In the first such experiment in humans, researchers say a quadriplegic patient with spinal cord injury produced brain signals that allowed him to shift a cursor on a computer screen. thinkpad

Using signals picked up by a sensor implanted in his brain that were then translated into electronic impulses, the 25-year-old man was able to control a computer cursor that allowed him to manipulate mechanical devices. microsoft

Successful use of this brain-computer interface device is being hailed as an important breakthrough for those paralyzed by injury or disease. One of the most exciting findings is that one part of the brain -- the motor cortex that usually sends its signals down through the spinal cord to control movement -- can still be used by this patient to control an external device, even after the spinal cord injury, said lead researcher Dr. Leigh Hochberg, a neurologist at Massachusetts General Hospital. laptop computers

The study utilized a new brain-computer interface device called the BrainGate Neural Interface System. It s in the early stages of clinical testing, Hochberg said. His team reports the findings in the July 13 issue of Nature. The patient under study is a 25-year-old man who suffered a knife wound in 2001 that cut his spinal cord at the neck, leaving his arms and legs paralyzed. In the trial, the patient underwent 57 sessions over nine months, during which time the implanted BrainGate sensor recorded activity in his motor cortex while the man imagined moving his paralyzed limbs. He then used that imagined motion in several computer-based tasks. laptop computer

Within little or no learning time, the patient began to be able to move a computer cursor via the device to open simulated e-mail, draw circular shapes and play simple video games. He also was able to open and close a prosthetic hand and use a robotic limb to grasp and move objects, the researchers said. desktop computer

The findings may have implications for paralyzed patients everywhere. In the short run, it may be possible for someone who can t use their arms or legs to regain control over their environment, Hochberg said. In the long-run, using additional stimulation technology, they may be able to regain control over their own limbs, he added. notebooks

Hochberg see this as an important first step in helping paralyzed patients regain some control over their lives. This study suggests that the signals in the motor cortex are not only still there, but they can be modulated voluntarily to do things that are similar to what those cells were doing before, Hochberg said. So, it is possible that someone who can t use their arms might be able to use the same cell in the motor cortex through a device like this to control a cursor on a computer screen and therefore improve their ability to control their environment. lenovo

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The finding is published in the Jan. 22 issue of the Archives of Internal Medicine. For the study, Goltzman and his colleagues reviewed information on 137 patients -- average age 65 -- who took SSRIs. The patients had their bone mineral density measured at the start of the study and were followed for five years. Each year, the patients were also asked to report any fractures they had and how they occurred. gateway

Goltzman s team found these patients had twice the risk of fractures. They were particularly vulnerable to breaks of the forearm, ankle and foot, and less so to fractures of the hip, rib, femur, and back, the study found. laptop parts

Goltzman s group also found that use of SSRIs was associated with an increased risk of falling. The effect depended on the dose of the drug. Doubling the dose resulted in a 1.5-fold increase in the risk of falling. software

Daily SSRI use was also associated with a 4 percent decrease in bone mineral density at the hip, and a 2.4 percent decrease at the spine, the researchers reported. Patients need to know there s this risk of fractures with SSRIs, Goltzman said. Patients should not be told not to take SSRIs if they need them for depression, he said. But this is a new risk that has been identified, and patients should take general steps to prevent osteoporosis. And they should have a bone density measurement before starting SSRIs and periodically after that. hard drives

But one expert said he thought the study failed to prove that SSRI use is linked to an increased risk of bone breaks. These findings are hard to interpret, said Dr. Robert P. Heaney, a professor of medicine at the Osteoporosis Research Center at Creighton University in Omaha, Neb. Increased fracture risk has been associated with depression for years, he added. Heaney said that to really uncover the role SSRIs may play in fractures, a study would have to compare depressed patients taking SSRIs with depressed patients taking other medications. Then you could see if it was the depression causing the fractures or if it were the SSRIs. It may not be the SSRI at all, he said. electronics

Studies like Goltzman s run the risk that people will stop taking their medication, Heaney said. These kind of studies do some potential harm, he said. More information The U.S. National Institute of Mental Health can tell you more about depression. SOURCES: David Goltzman, M.D., professor of medicine and physiology, director of the McGill Centre for Bone and Periodontal Research, McGill University, Montreal, Canada; Robert P. Heaney, M.D., professor, medicine, Osteoporosis Research Center, Creighton University, Omaha, Neb.; Jan. 22, 2007, Archives of Internal Medicine canon

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Health Tip: Produce May Harbor Pesticides

Choose wisely to avoid exposure Updated: 4/26/2007 3:26:48 PM Print Article Email Article (HealthDay News) -- Fruits and vegetables often are sprayed with pesticides to ward off bugs. desktop computers

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