#$%^&*AU2017203492A120170615.pdf#####ABSTRACT A device and method for evaluating or improving perceptual-cognitive abilities of a subject, comprising displaying virtual objects moving in a given three-dimensional environment during successive tests. The subject is in visual contact with the virtual objects moving in the three-dimensional environment, and the speed of movement of the virtual objects in the three-dimensional environment during the successive tests is changed.3/115 N L!1