We examined the effects of visual noises caused by wall-moving robots on task-performance. Subjects attended to Calculating-task and Inputting-task on a desktop display while the projected black circles as visual noises were moving on the front wall. Results indicated 1) Answering-time for Calculating-task was increased while black circles were moving in the area within 35-degrees from Gazing-point for the task. 2) Just after black circles appeared on the horizontal area spread on Gazing-point, Answering-time for the first quest of Calculating-task was increased. 3) While black circles were moving on the same horizontal area on Gazing-point, Eye-blinking rate was increased.
