Mind-controlled prosthetic limbs allow precise, smooth movement

Thu May 21, 2015 2:58pm EDT
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By Will Dunham

WASHINGTON (Reuters) - More than a decade after becoming paralyzed from the neck down, Erik Sorto has been unable to perform even the simplest of daily tasks.

"That was the ultimate goal: to drink a beer by myself," said Sorto, a 34-year-old from Los Angeles who became a quadriplegic after a 2002 gunshot wound.

Things may be looking up for Sorto and others with similar disabilities. Scientists on Thursday described a better way to harness mind power to move prosthetic limbs.

Microelectrodes, implanted in the part of the brain that controls a person's intention to perform a movement, enabled a patient to fluidly guide a robotic arm, they said.

In a study published in the Science journal, surgeons at Keck Medicine of the University of Southern California placed a pair of small electrode arrays into Sorto's posterior parietal cortex, or PPC.

These neural prosthetics were then connected to computers that processed Sorto's brain signals and determined his intent, allowing him to control a robotic arm mounted to a table nearby, or a computer cursor.

"Mr. Sorto was able to learn to grasp different objects, play 'rock-paper-scissors,' play video games, drink a beverage," said California Institute of Technology neuroscientist Richard Andersen, who led the study.

"The PPC is a rich source of signals that can be used to determine the goals of a paralyzed subject," said Andersen. "These signals can be used to control 'smart' robotics and computers that can work out the details of movement of external devices such as a robotic limb."   Continued...

Patient Erik Sorto takes a drink in this handout photo taken April 2015, provided by Lance Hayashida/Caltech. REUTERS/Spencer Kellis and Christian Klaes, Caltech/Handout via Reuters