Comprehensive Oculometric Behavioral Response Assessment (COBRA) is a NASA-patented technology to assess dynamic vision, by measuring various aspects of an observer's ability to perceive and track motion, consisting of two different types of movement: smooth pursuit and saccades. Smooth pursuit moves the eye to stabilize the moving image of a target object on the retina, and saccades quickly flick the eye to place the image of a target object on the central portion of the retina. This test delivers some well-known, long-standing metrics from oculomotor physiology as well as more recently-developed tracking metrics, summarizing the coordination between smooth pursuit and saccadic eye movements, and signal-to-noise properties of several dimensions of motion perception.
At a basic level, COBRA is similar to other well-known assessments that use eye movements to assess brain health in the field (field sobriety test, the Military Acute Concussion Evaluation: MACE), and in the clinic (gross neurological examination). Whereas these assessments can detect gross signs of sensorimotor impairment visible to the naked eye, COBRA delivers quantitative metrics measured with neuroFit's ONE device.
Latency measures the elapsed time between the appearance of a moving stimulus and the tracking response.
Acceleration measures how quickly the eye starts to move during the initial response. Is it sluggish or zippy?
Gain measures how well the eye matches target speed.
Speed responsiveness measures how well the observer responds to differences in target speed.
Proportion smooth measures how much of the tracking movement consists of smooth pursuit.
Catch-up saccade amplitude measures the size of the corrections the eye makes during tracking.
Direction noise measures variability in the observer's perception of direction.
Speed noise measures variability in the observer's perception of speed.