a system for detecting and recording head orientations of a person includes : a first sensor device capable of providing sensor data regarding a head orientation of a person in a three - dimensional space ; a medical data acquisition system configured for storing and outputting the sensor data from the first sensor device ; and a processor configured for processing the sensor data from the medical data acquisition system , outputting a first signal representing the head orientation , and generating an image for presentation by a graphical display ; wherein the image comprises : a first reference indicator ; an orientation indicator , wherein a position of the orientation indicator in the image is determined based on the first signal from the processor , and a feedback indicator when a first condition is met .