The behavior and interplay of two types of neurons in the brain helps give humans and other animals an uncanny ability to navigate by building a mental map of their surroundings. Now one robot has been given a similar cluster of virtual cells to help it find its own way around.
Researchers in Singapore simulated two types of cells known to be used for navigation in the brain—so-called “place” and “grid” cells—and showed they could enable a small-wheeled robot to find its way around. Rather than simulate the cells physically, they created a simple two-dimensional model of the cells in software. The work was led by Haizhou Li, a professor at the Agency for Science, Technology and Research (A*STAR).
“Artificial grid cells could provide an adaptive and robust mapping and navigation system,” Li wrote in an e-mail coauthored with Huajin Tang and Yuan Miaolong, two research scientists at A*STAR who coauthored a paper about the work. “Humans and animals have an instinctual ability to navigate freely and deliberately in an environment rather effortlessly.”
The work is significant because it shows the potential for having machines mimic more complex activity in the brain. Roboticists increasingly use artificial neural networks to train robots to perform tasks such as object recognition and grasping, but these networks do not faithfully reflect the complexity and subtlety of a real biological brain.
“Neural networks are actually very loosely inspired by the brain,” says Oren Etzioni, CEO of the Allen Institute for Artificial Intelligence in Seattle. “They are distributed computing elements, but they’re very simple as compared with neurons; the connections are extremely simple as compared with a synapse.” He says this new development that takes inspiration from the brain “seems like good work.”
Place cells were first identified in the 1970s by John O’Keefe, who found that they fire whenever a mouse passed the same spot in an area. Grid cells, pinpointed in a different part of the brain by May-Britt and Edvard Moser in 2005, activate when an animal arrives at any location on a triangular grid of points, thereby providing a more detailed sense of position in space.
Together with other types of cells, and by processing sensory information, grid and place cells are thought to afford animals with an innate sense of the world around them and of their location within it. The discovery of these cells earned the three scientists involved the Nobel Prize in Medicine in 2014 (see “Nobel for Brain’s Location Code”).
The Singaporean researchers tested the approach on a robot let loose in a 35-square-meter office space. They had the robot roam around the office space, and verified that its artificial place and grid cells functioned in a comparable way to their biological counterparts.
The navigation system isn’t yet as good as a conventional one, and the researchers say they need to develop a better understanding of the way biological cells function in order to improve it. However, they suggest that it could offer advantages over conventional systems, which may be confused by changes to an environment, for example.
As well as providing a more efficient and reliable way for machines to get about, Li hopes that the work could help neuroscientists understand the functioning of the brain’s navigation system. “This will provide a solution to predict neural activities using mobile robots before conducting experiments on rats,” the researchers write.
Artificial intelligence researchers are increasingly looking to research on the brain for ways to refine modern approaches to machine learning. However, Etzioni of the Allen Institute notes that the complexity of the organ makes applying neurological research difficult. “Which is why this work is exciting,” he says.
Toronto wants to kill the smart city forever
The city wants to get right what Sidewalk Labs got so wrong.
Chinese gamers are using a Steam wallpaper app to get porn past the censors
Wallpaper Engine has become a haven for ingenious Chinese users who use it to smuggle adult content as desktop wallpaper. But how long can it last?
Yann LeCun has a bold new vision for the future of AI
One of the godfathers of deep learning pulls together old ideas to sketch out a fresh path for AI, but raises as many questions as he answers.
The US military wants to understand the most important software on Earth
Open-source code runs on every computer on the planet—and keeps America’s critical infrastructure going. DARPA is worried about how well it can be trusted
Get the latest updates from
MIT Technology Review
Discover special offers, top stories, upcoming events, and more.