Systems and methods provided utilize gaze-tracking to measure quantitatively and accurately the ability of an athlete or other subject suspected of a concussion to maintain gaze within a figure-eight pattern during a given period of time. The fixation icon is presented at increasing velocities, with multiple staged velocities constituting the preferred embodiment. Utilizing a figure-eight pattern is preferred. Total tracking error time is tabulated during each velocity stage of the test protocol, and total tracking error time occurring during a given velocity stage is compared to a subjects baseline, e.g., a pre-season Individual Bioperformance Level (IBL) for that velocity stage. Systems and methods disclosed may be used to help prevent debilitating neurological damage in our athlete population, as well as having important military applications related to PTSD, and to other mission-critical performance endeavors.
