Dec 172012
 
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“This is a spectacular leap toward greater function and independence for people who are unable to move their own arms”

Reaching out to “high five” someone, grasping and moving objects of different shapes and sizes, feeding herself dark chocolate. For Jan Scheuermann and a team of researchers from the University of Pittsburgh School of Medicine and UPMC, accomplishing these seemingly ordinary tasks demonstrated for the first time that a person with longstanding quadriplegia can maneuver a mind-controlled, human-like robot arm in seven dimensions (7D) to consistently perform many of the natural and complex motions of everyday life.

In a study published in the online version of The Lancet, the researchers described the brain-computer interface (BCI) technology and training programs that allowed Ms. Scheuermann, 53, of Whitehall Borough in Pittsburgh, Pa. to intentionally move an arm, turn and bend a wrist, and close a hand for the first time in nine years.

Less than a year after she told the research team, “I’m going to feed myself chocolate before this is over,” Ms. Scheuermann savored its taste and announced as they applauded her feat, “One small nibble for a woman, one giant bite for BCI.”

“This is a spectacular leap toward greater function and independence for people who are unable to move their own arms,” agreed senior investigator Andrew B. Schwartz, Ph.D., professor, Department of Neurobiology, Pitt School of Medicine. “This technology, which interprets brain signals to guide a robot arm, has enormous potential that we are continuing to explore. Our study has shown us that it is technically feasible to restore ability; the participants have told us that BCI gives them hope for the future.”

In 1996, Ms. Scheuermann was a 36-year-old mother of two young children, running a successful business planning parties with murder-mystery themes and living in California when one day she noticed her legs seemed to drag behind her. Within two years, her legs and arms progressively weakened to the point that she required a wheelchair, as well as an attendant to assist her with dressing, eating, bathing and other day-to-day activities. After returning home to Pittsburgh in 1998 for support from her extended family, she was diagnosed with spinocerebellar degeneration, in which the connections between the brain and muscles slowly, and inexplicably, deteriorate.

“Now I can’t move my arms and legs at all. I can’t even shrug my shoulders,” she said. “But I have come to the conclusion that worrying about something is experiencing it twice. I try to dwell on the good things that I have.”

A friend pointed out an October 2011 video about another Pitt/UPMC BCI research study in which Tim Hemmes, a Butler, Pa., man who sustained a spinal cord injury that left him with quadriplegia, moved objects on a computer screen and ultimately reached out with a robot arm to touch his girlfriend.

“Wow, it’s so neat that he can do that,” Ms. Scheuermann thought as she watched him. “I wish I could do something like that.” She had her attendant call the trial coordinator immediately, and said, “I’m a quadriplegic. Hook me up, sign me up! I want to do that!”

On Feb. 10, 2012, after screening tests to confirm that she was eligible for the study, co-investigator and UPMC neurosurgeonElizabeth Tyler-Kabara, M.D., Ph.D., assistant professor, Department of Neurological Surgery, Pitt School of Medicine, placed two quarter-inch square electrode grids with 96 tiny contact points each in the regions of Ms. Scheuermann’s brain that would normally control right arm and hand movement.

“Prior to surgery, we conducted functional imaging tests of the brain to determine exactly where to put the two grids,” she said. “Then we used imaging technology in the operating room to guide placement of the grids, which have points that penetrate the brain’s surface by about one-sixteenth of an inch.”

The electrode points pick up signals from individual neurons and computer algorithms are used to identify the firing patterns associated with particular observed or imagined movements, such as raising or lowering the arm, or turning the wrist, explained lead investigator Jennifer Collinger, Ph.D., assistant professor, Department of Physical Medicine and Rehabilitation (PM&R), and research scientist for the VA Pittsburgh Healthcare System. That intent to move is then translated into actual movement of the robot arm, which was developed by Johns Hopkins University’s Applied Physics Lab.

Two days after the operation, the team hooked up the two terminals that protrude from Ms. Scheuermann’s skull to the computer. “We could actually see the neurons fire on the computer screen when she thought about closing her hand,” Dr. Collinger said. “When she stopped, they stopped firing. So we thought, ‘This is really going to work.’”

Within a week, Ms. Scheuermann could reach in and out, left and right, and up and down with the arm, which she named Hector, giving her 3-dimensional control that had her high-fiving with the researchers. “What we did in the first week they thought we’d be stuck on for a month,” she noted.

Before three months had passed, she also could flex the wrist back and forth, move it from side to side and rotate it clockwise and counter-clockwise, as well as grip objects, adding up to what scientists call 7D control. In a study task called the Action Research Arm Test, Ms. Scheuermann guided the arm from a position four inches above a table to pick up blocks and tubes of different sizes, a ball and a stone and put them down on a nearby tray. She also picked up cones from one base to restack them on another a foot away, another task requiring grasping, transporting and positioning of objects with precision.

“Our findings indicate that by a variety of measures, she was able to improve her performance consistently over many days,” Dr. Schwartz explained. “The training methods and algorithms that we used in monkey models of this technology also worked for Jan, suggesting that it’s possible for people with long-term paralysis to recover natural, intuitive command signals to orient a prosthetic hand and arm to allow meaningful interaction with the environment.”

Read more . . .

via University of Pittsburgh Medical Center
 

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