Inaccurate Space Perception Seeing Through Fences.

Area of Science:

• Psychology
• Perception Science
• Visual Perception

Background:

• The sequential surface integration process hypothesis emphasizes the role of ground surface representation in perceiving egocentric distance.
• Opaque obstacles (boxes, walls) are known to cause underestimation of egocentric distance.
• Perforated obstacles (fences) are common in daily life and simultaneously occlude ground surfaces and targets.

Purpose of the Study:

• To investigate the impact of perforated obstacles, specifically fences, on human space perception.
• To determine if the presence of fences affects egocentric distance estimation.
• To compare the effects of different fence characteristics (spacing, thickness, material) on distance perception.

Main Methods:

• Three virtual reality experiments were conducted to simulate viewing targets through fences.
• Participants estimated egocentric distances under conditions with and without fences.
• Target size was varied (1°, 2°, 4° visual angle) to assess the robustness of the observed effects.

Main Results:

• Observers consistently underestimated egocentric distances when a fence was present compared to a no-fence condition.
• Widely spaced, thick wood fences resulted in a greater underestimation of distance than narrowly spaced, thin iron fences.
• The observed underestimation effect remained robust across different target sizes.

Conclusions:

• Perforated obstacles like fences significantly influence egocentric distance perception, leading to underestimation.
• The findings support the applicability of the sequential surface integration process hypothesis to situations involving perforated obstacles.
• Fence characteristics, such as spacing and thickness, modulate the degree of egocentric distance underestimation.