A camera is installed for steering using eye movements. To cause the wheelchair go to the right or left, the user needs only to glance toward the right or left. Accelerating and braking are triggered by looking upward or downward. For steering by thought, the wheelchair user wears a cap with 16 sensors that continuously measure brain activation. The system is trained to distinguish four brain patterns: drive left, drive right, accelerate, and brake. After a training period, the user should be able to steer the wheelchair just by thinking. A great deal of concentration is required, as ideally the user should think of only the four practiced patterns the entire time. Since obstacles automatically cause the wheelchair to stop, the person remains accident-free in any case. Previously, the group had demonstrated steering a car using only brain power.
The intelligent wheelchair is based on research from the AutoNOMOS Labs at Freie Universität Berlin. Scientists working in the innovation labs funded by the German Federal Ministry of Research are working on the development of autonomous and driver-assisted systems with the aim of preventing traffic accidents in the future and to improve traffic safety through the use of modern sensor and computer technology. In the labs future scenarios are simulated to investigate steering in various types of vehicles, both conventional and electric cars, as well as wheelchairs. Voice recognition for wheelchairs is in the planning stage. The idea is that the user would be able to command the wheelchair to go into a certain room or to follow a person. Robotic gripper arms will be added to the wheelchair, permitting the user to access objects on higher shelves.