Three-dimensional images on multiple depth layers of the volumetric display provide the physiological depth cues whichensure the high precision of depth judgements at close viewing distances and enhance the user experience. However, thecontribution of physiological cues declines with an increase of viewing distance (egocentric distance), and the humanspatial perception varies depending on the inter-stimuli distance (exocentric distance). We conducted a psychophysicalexperiment to test the perception of three-dimensional images rendered on the volumetric display depending onexocentric and egocentric stimuli distance. The constant angular size visual stimuli were displayed on different depthlayers of the optical element at three eccentricities in a random order. In 4AFC tasks, observers were required to indicatethe closest stimulus. The decline in performance was evident at the largest tested exocentric distance, and it became morepronounced with an increase of egocentric distance. However, no performance differences manifested themselves whenstimuli were located close to each other. Namely, the correct relative depth judgements were given quickly regardless ofslight changes in the egocentric distance. We discuss how the viewing distance and spatial layout of stimuli facilitateperception of three-dimensional images on the volumetric display.
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