Abstract: A non-electronic head-worn system for providing visual inertial head orientation information to a person is disclosed. The system comprises a head-worn unit that displays at least one orientation reference symbol to the person wearing the unit wherein the orientation reference symbol stays in a fixed visual position for the person when the person's head changes orientation. The system comprises an optical element located in the optical path between the user's eye and the orientation reference symbol, such as a lens, mirror, a prism, a beam splitter, a retro-reflector, or any other device or medium that can change the appearance or apparent location of an image. The system further comprises a pitch indicator that gives visual pitch information to the person and/or a roll indicator that gives visual roll information to the person. The pitch indicator and the roll indicator are responsive to a pendulum, a rolling element, or a fluid in a reservoir.

Abstract: A sensor system and method for determining if an environment is provocative, measuring a human response to this environment, and controlling a vehicle or device is disclosed. The system and method comprise a human head-worn unit with an orientation sensing element, a head-attachable display comprising a first image not responsive to pitch and roll and a display element responsive to the orientation sensing element. The system and method also comprises at least one human response sensor such as a galvanic skin response sensor, a blood pressure sensor, or an electroencephalograph. The system and method further comprise an algorithm that computes a signal that is a measure of the condition of the human based on input from the orientation sensing element and the human response sensor or sensors. The system and method also comprise an electronic interface configured for transmitting the human physical condition signal.

Abstract: A system and method for using a virtual reality or an augmented reality environment for the measurement and/or improvement of human vestibulo-ocular performance can be implemented by combining a video camera based eye orientation sensor, a head orientation sensor, a display, and an electronic circuit that connects the eye sensor, head sensor, and display. The system and method can be operated in the range of frequencies between 0.01 Hertz and 15 Hertz. The system and method can use a Fourier transform to compute a gain and a phase. The system and method can be used for measuring vestibulo-ocular reflex, dynamic visual acuity, dynamic visual stability, kinetic visual acuity, retinal image stability, or foveal fixation stability in a non-clinical setting. The system and method can be completely portable, head-worn, and self-contained.