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Proceedings Paper

Impact of viewing distance on relative depth judgements for stimuli in physical space
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Paper Abstract

In natural viewing, numerous depth cues are available to the visual system, but their significance varies considerably depending on the viewing distance. How is it reflected in the outcome of depth judgements? We have designed a psychophysical experiment with a limited number of depth cues to examine distance-related changes in the correct response rate and time. Twenty young adults evaluated relative depth of stimuli in physical space. Each time four constant angular size achromatic stimuli were presented on a volumetric multi-planar display. One of these stimuli was demonstrated closer to the observer comparing to others. The experiment followed the four-interval forced-choice procedure. On any given trial, observers determined which one of four stimuli was located closest to them. The nine viewing distances ranged from 0.5 m to 2.5 m. Overall, the depth judgements were correct and fast at the close viewing distances. However, the correct response rate dropped markedly at 1.0 m distance and continued declining gradually at larger distances. The average response time experienced the linear growth with increasing distance. In total, we showed that the relative depth judgements based on binocular depth cues changed the most at the viewing distances that exceeded 1.0 m, as well as the response time and correctness were affected to varying degrees.

Paper Details

Date Published: 30 August 2019
PDF: 7 pages
Proc. SPIE 11099, Light in Nature VII, 1109904 (30 August 2019); doi: 10.1117/12.2530438
Show Author Affiliations
Tatjana Pladere, Univ. of Latvia (Latvia)
Gunita Jankovska, Univ of Latvia (Latvia)
Vita Konosonoka, Univ. of Latvia (Latvia)
Karola Panke, Univ. of Latvia (Latvia)
Gunta Krumina, Univ. of Latvia (Latvia)

Published in SPIE Proceedings Vol. 11099:
Light in Nature VII
Katherine Creath; Vasudevan Lakshminarayanan; Joseph A. Shaw, Editor(s)

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