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The path of all distractors is defined as an arc (dashed line) directly in front of the user with sinusoidal displacement along the arc. The distractor moves along the arc causing the subject to turn her head back and forth to keep the distractor in view. The distractor is displayed 1.75 meters away from the user, and the height of all distractors is approximately 0.5 meters. The same path trajectory is used for all distractors in each of the three experiments.
