scholarly journals A ground surface based space perception in the virtual environment

2010 ◽  
Vol 2 (7) ◽  
pp. 513-513 ◽  
Author(s):  
B. Wu ◽  
Z. J. He ◽  
T. L. Ooi
Keyword(s):  
Virtual Environment ◽  
Ground Surface ◽  
Space Perception

Inaccurate Space Perception Seeing Through Fences

Perception ◽  
2020 ◽  
Vol 49 (9) ◽  
pp. 926-939
Author(s):  
Bo Dong ◽  
Airui Chen ◽  
Yuting Zhang ◽  
Changchun Li ◽  
Tianyang Zhang ◽  
...  
Keyword(s):  
Virtual Reality ◽  
Visual Angle ◽  
Daily Life ◽  
Ground Surface ◽  
Space Perception ◽  
Vital Role ◽  
Target Size ◽  
Integration Process ◽  
Egocentric Distance ◽  
Surface Integration

According to the sequential surface integration process hypothesis, the fine near-ground-surface representation and the homogeneous ground surface play a vital role in the representation of the ground surface. When an occluding box or opaque wall is placed between observers and targets, observers underestimate egocentric distance. However, in our daily life, many obstacles are perforated and cover the ground surface and targets simultaneously (e.g., fences). Humans see and observe through fences. The images of these fences and targets, projected onto observers’ retinas, overlap each other. This study aims to explore the effects of perforated obstacles (i.e., fences) on space perception. The results showed that observers underestimated the egocentric distances when there was a fence on the ground surface relative to the no-fence condition, and the effect of widely spaced thick wood fences was larger than that of narrowly spaced thin iron fences. We further demonstrated that this effect was quite robust when the target size had a visual angle of 1°, 2°, or 4° in three virtual reality experiments. This study may add support for the notion that the sequential surface integration process hypothesis is applicable even if the obstacle is perforated and covers the target.

The Effect of Viewing a Self-Avatar on Distance Judgments in an HMD-Based Virtual Environment

2010 ◽  
Vol 19 (3) ◽  
pp. 230-242 ◽  
Author(s):  
Betty J Mohler ◽  
Sarah H Creem-Regehr ◽  
William B Thompson ◽  
Heinrich H Bülthoff
Keyword(s):  
Virtual Environments ◽  
Virtual Environment ◽  
Virtual World ◽  
Space Perception ◽  
Objective Measure ◽  
Embodied Perception ◽  
Egocentric Distance ◽  
Near Space ◽  
Similar Accuracy ◽  
Distance Judgments

Few HMD-based virtual environment systems display a rendering of the user's own body. Subjectively, this often leads to a sense of disembodiment in the virtual world. We explore the effect of being able to see one's own body in such systems on an objective measure of the accuracy of one form of space perception. Using an action-based response measure, we found that participants who explored near space while seeing a fully-articulated and tracked visual representation of themselves subsequently made more accurate judgments of absolute egocentric distance to locations ranging from 4 m to 6 m away from where they were standing than did participants who saw no avatar. A nonanimated avatar also improved distance judgments, but by a lesser amount. Participants who viewed either animated or static avatars positioned 3 m in front of their own position made subsequent distance judgments with similar accuracy to the participants who viewed the equivalent animated or static avatar positioned at their own location. We discuss the implications of these results on theories of embodied perception in virtual environments.

scholarly journals Functional Autonomy Affects Elderly Spatial Perception in Body-Centered Coordinates

2020 ◽  
Vol 2020 ◽  
pp. 1-8 ◽  
Author(s):  
Giorgia Committeri ◽  
Valentina Sebastiani ◽  
Francesco de Pasquale ◽  
Massimiliano Stocchi ◽  
Chiara Fini
Keyword(s):  
Reference Frames ◽  
Spatial Perception ◽  
Ground Surface ◽  
Space Perception ◽  
Distance Judgment ◽  
The Elderly ◽  
The Body ◽  
Ability To Act ◽  
Extrapersonal Space ◽  
Functional Autonomy

According to the action-specific theory of perception, a person’s dynamic ability to act in the environment affects her/his spatial perception. Empirical evidence shows that the elderly perceive distances as farther compared with younger adults and that the harder the ground surface to walk, the farther the perceived distance. Such results suggest a general perceptual readaptation promoted by the aging process that is fine-tuned with the decline of the motor resources. However, it is still unknown whether the elderly space perception is affected by interindividual differences in their functional autonomy (FA) and whether the decline of motor resources affects spatial categorization only when distances are judged with reference to the observer’s own body or also when they are judged with reference to the body of another agent present in the scene. To this aim, a sample of elderly adults with preserved cognitive functions but different levels of FA, measured through the Instrumental Activity of Daily Living (IADL) scale, were enrolled and tested on the extrapersonal space categorization task. This task requires judging the position of a target as “Near” or “Far” with respect to different reference frames (RFs): centered on the observer’s body (Self RF) or centered on external elements, like another body (Other RF) or an object (Object RF). Results indicated that the higher the level of FA, the wider the space categorized as “Near” when adopting as reference frame our own body or the body of another agent in the scene, but not a static object. In conclusion, the individual functional autonomy of elderly individuals, which is strongly influenced by motor resources and efficiency, modulates how the surrounding space is represented, but only when the distance judgment implies an agent body, thus providing new relevant data for recent embodied cognition models of aging.

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