Descrição "Frère Jacques. Frère Jacques. Dormez-vous?" Aspect Medical Systems can give you the answer. The company makes the BIS System, which can assess consciousness levels during surgery. The system is based on its Bispectral Index technology, which measures the effects of anesthetics on the brain. The BIS is designed to prevent surgical awareness, wherein patients become conscious during surgery though they appear anesthetized and are unable to communicate, as well as to improve recovery processes. Aspect Medical Systems markets the system, which includes monitors, module kits, and sensors, in the US and abroad through direct sales and distribution agreements.