Citation

Kenyon RV, Phenany M, Sandin D, Defanti T. Ann. Biomed. Eng. 2008; 36(2): 342-348.

Affiliation

Electronic Visualization Lab, Department of Computer Science (m/c/152), University of Illinois at Chicago, SEO Building, Rm 1120, Chicago, IL 60607, USA. kenyon@uic.edu

Copyright

(Copyright © 2008, Holtzbrinck Springer Nature Publishing Group)

DOI

10.1007/s10439-007-9414-7

PMID

18066664

Abstract

Accommodation has been suspected as a contributor to size illusions in virtual environments (VE) due to the lack of appropriate accommodative stimuli in a VE for the objects displayed. Previous experiments examining size-constancy in VE have shown that monocular cues to depth that accompany the object are a major contributor to correct size perception. When these accompanying cues are removed perceived size varied with the object's distance from the subject, i.e., visual angle. If accommodation were the dominant mechanism contributing to a visual angle response due to its action to keep physical objects clear in this condition, an open-loop accommodation viewing condition might restore size-constancy to this condition. Pinhole apertures were used to open-loop accommodation and examine if size-constancy might be restored when few accompanying monocular cues to depth were present. Visual angle performance when viewing a low cue environment was found with and without the use of the pinhole apertures. Thus, these results signify that accommodation does not play a dominate role in the loss of size-constancy in sparse visual environments often used in VE. These results suggest that size-constancy is driven by the inclusion of the remaining monocular cues to depth in VE as it is in the physical world.

Language: en