Objects associated with fixation regions are used to support training tasks that are characterized by operation within a dynamic 3D environment, problem-solving that involves user multi-tasking, fast decisions, heavy workloads, potential for unexpected events, and the need for high-performance skills. The invention is ideally suited to measure the nuances associated with maintaining situation awareness in such tasks where dynamic 3D environments that support problem solving with high cognitive fidelity have already been developed. Potential training application areas include urban warfighting, night vision goggle use, aircraft piloting, helicopter operation, remote control of vehicles and robots, night driving, air traffic control, and quarterback decision-making.