Brain Anticipates Movement, Improving Control: New Research Reveals Neural Mechanisms
A new study sheds light on how the brain anticipates and prepares for movement, leading to more effective motor control. Researchers, lead by Dr. Jonathan A. Michaels (York University) and senior author Pruszynski (Western University), discovered that muscles respond more efficiently when external disturbances align with the brain’s expectations.
The study involved using a robotic device to apply subtle pushes to participants’ arms while sometimes providing cues about the likely direction of the force. Participants adjusted their movements based on these probabilities, demonstrating the brain’s ability to predict and prepare for external forces.
To understand the underlying neural processes, the team also recorded activity from thousands of neurons in monkeys performing a similar task. This revealed that motor circuits don’t simply react to disturbances, but proactively enter a “preparatory state,” anticipating potential disruptions and linking them to appropriate responses. Computer models trained under the same conditions mirrored these predictive strategies, confirming that expectations naturally enhance arm control.
The research team included Western Research Chair for Motor Control and Computational Neuroscience Jörn Diedrichsen, PhD, and professor Paul Gribble, PhD, collaborators within Western’s Sensorimotor Superlab.
Pruszynski, associate director of the Western Institute for neuroscience, emphasized the importance of open data sharing. the comprehensive dataset generated by the study is already being utilized by other researchers and is expected to drive further discoveries in understanding brain-controlled movement. The team hopes this data will contribute to advancements in areas like stroke rehabilitation and brain-computer interface technology.
The study leveraged advanced neuropixels technology, capable of recording from thousands of neurons simultaneously using a small probe. This represents a significant leap forward from even fifteen years ago, when recording a comparable number of neurons would have taken years. Pruszynski noted that during his PhD, he recorded approximately 1,000 neurons over seven years, whereas current technology allows for the same yield in just a day or two. This increased efficiency enables researchers to explore questions previously beyond reach.
the findings underscore the importance of studying coordinated neural activity, as understanding individual neurons alone is insufficient to fully grasp brain function. the research highlights how the brain’s predictive capabilities are fundamental to even basic movements, and has broad implications for understanding human behavior.
