Researchers have reconstructed 3-D hand motions from brain signals recorded in a non-invasive way, according to a study.
Until now, to reconstruct hand motions, researchers have used non-portable and invasive methods that place sensors inside the brain. In this study, a team of neuroscientists led by José Contreras-Vidal, placed an array of sensors on the scalps of five participants to record their brains' electrical activity, using a process called electroencephalography (EEG). Volunteers were asked to reach from a center button and touch eight other buttons in random order ten 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 (of the 34 used) 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.
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 to regain control of complex tasks without needing to have electrodes implanted in their brains," said Jonathan Wolpaw of the New York State Department of Health's Wadsworth Center in Albany, who was unaffiliated with the study.
The findings could also help improve existing EEG-based systems designed to allow movement-impaired people to control a computer cursor with just their thoughts. These systems now require that users undergo extensive training sessions. Contreras-Vidal said the length of this training could be reduced and more effortless control achieved using the methods in this study.
COMPAMED.de; Source: Society for Neuroscience