A non-invasive system could potentially operate a robotic arm or motorized wheelchair — an advance for people with disabilities or paralysis.
In this study, a team of neuroscientists led by José Contreras-Vidal, PhD, University of Maryland, College Park, placed an array of sensors on the scalps of five participants to record their brains’ electrical activity, using a process called electroencephalography or EEG. Volunteers were asked to reach from a center button and touch eight other buttons in random order 10 times, while the authors recorded their brain signals and hand motions. Afterward, the researchers attempted to decode the signals and reconstruct the 3-D hand movements.
“Our results showed that electrical brain activity acquired from the scalp surface carries enough information to reconstruct continuous, unconstrained hand movements,” Contreras-Vidal said.
The researchers found that one sensor in particular provided the most accurate information. The sensor was located over a part of the brain called the primary sensorimotor cortex, a region associated with voluntary movement. Useful signals were also recorded from another region called the inferior parietal lobule, which is known to help guide limb movement. The authors used these findings to confirm the validity of their methods.
This study has implications for future brain-computer interface technologies and for those already in existence.
“It may eventually be possible for people with severe neuromuscular disorders, such as amyotrophic lateral sclerosis (ALS), stroke, or spinal cord injury, to regain control of complex tasks without needing to have electrodes implanted in their brains,” Jonathan Wolpaw, MD, of the New York State Department of Health’s Wadsworth Center in Albany, who was unaffiliated with the study, said. “The paper enhances the potential value of EEG for laboratory studies and clinical monitoring of brain function.”