a study on intra operative alertness is currently underway in munich. patient nina have now is being prepared for knee surgery. this cap measures. brainwaves even more precisely than the standard 3 electrodes on the forehead. the researchers have developed a method for communicating with the patient in case she wakes up during surgery. that is to say it s a blood pressure cuff keeps the muscle relaxing medication from getting into her forearm. this ensures that if the patient is conscious while under anesthesia she can move her hand.