In an Atlanta lab, minibrains in dishes can control robots and computer-simulated animals. They may provide a simple model to study how the brain changes as it learns. Georgia Tech researcher Steve Potter calls his biological-mechanical hybrids Neurally Controlled Animats. Each Animat's "brain" consists of cultured rat neurons growing on a plate of electrodes. This live culture is linked to an artificial body—either a robotic animal or a computer-simulated one.
The brain cells can receive input from the synthetic critter's environment, process information, and stimulate behavior. For example, one of the Animats is linked to a robot with light-detecting sensors. Information from the sensors is sent to the brain culture, which sends a signal back to the robot instructing it to move toward the light. Other Animats can chase a target around a room, scribble simple drawings, and move around obstacles.
Until recently, training Animats had been tough. The cultured ...
