The Perception of Distances and Spatial Relationships in Natural Outdoor Environments

The ability of observers to perceive distances and spatial relationships in outdoor environments was investigated in two experiments. In experiment 1, the observers adjusted triangular configurations to appear equilateral, while in experiment 2, they adjusted the depth of triangles to match their base width. The results of both experiments revealed that there are large individual differences in how observers perceive distances in outdoor settings. The observers' judgments were greatly affected by the particular task they were asked to perform. The observers who had shown no evidence of perceptual distortions in experiment 1 (with binocular vision) demonstrated large perceptual distortions in experiment 2 when the task was changed to match distances in depth to frontal distances perpendicular to the observers' line of sight. Considered as a whole, the results indicate that there is no single relationship between physical and perceived space that is consistent with observers' judgments of distances in ordinary outdoor contexts.

[1]  Atsuki Higashiyama,et al.  Variation of curvature in binocular visual space estimated by the triangle method , 1981, Vision Research.

[2]  Judy Czylok A SENSE OF TOUCH , 1979, Nursing standard (Royal College of Nursing (Great Britain) : 1987).

[3]  Zijiang J. He,et al.  Judging Egocentric Distance on the Ground: Occlusion and Surface Integration , 2004, Perception.

[4]  H. JACKM.,et al.  Optic flow and the metric of the visual ground plane , 1998, Vision Research.

[5]  J J Koenderink,et al.  Direct Measurement of the Curvature of Visual Space , 2000, Perception.

[6]  J. Todd,et al.  Effects of Texture, Illumination, and Surface Reflectance on Stereoscopic Shape Perception , 1996, Perception.

[7]  Young-Lim Lee,et al.  The visual perception of length along intrinsically curved surfaces. , 2010, Perception & psychophysics.

[8]  J. Loomis,et al.  Visual space perception and visually directed action. , 1992, Journal of experimental psychology. Human perception and performance.

[9]  J S Tittle,et al.  The visual perception of three-dimensional length. , 1996, Journal of experimental psychology. Human perception and performance.

[10]  A. Battro,et al.  Riemannian Geometries of Variable Curvature in Visual Space: Visual Alleys, Horopters, and Triangles in Big Open Fields , 1976, Perception.

[11]  N I HARWAY,et al.  Judgment of distance in children and adults. , 1963, Journal of experimental psychology.

[12]  Zijiang J. He,et al.  Perceiving distance accurately by a directional process of integrating ground information , 2004, Nature.

[13]  J. Philbeck,et al.  Is the anisotropy of perceived 3-D shape invariant across scale? , 1999, Perception & psychophysics.

[14]  J. Koenderink,et al.  Depth Relief , 1995, Perception.

[15]  José Antonio Aznar-Casanova,et al.  [On the metric of visual space]. , 2006, Arquivos brasileiros de oftalmologia.

[16]  Robert B. Lawson,et al.  Human stereopsis : a psychophysical analysis , 1976 .

[17]  John M Foley,et al.  Visual perception of extent and the geometry of visual space , 2004, Vision Research.

[18]  James T Todd,et al.  The visual perception of 3-D shape from multiple cues: Are observers capable of perceiving metric structure? , 2003, Perception & psychophysics.

[19]  A A BLANK,et al.  Analysis of experiments in binocular space perception. , 1958, Journal of the Optical Society of America.

[20]  J J Koenderink,et al.  On So-Called Paradoxical Monocular Stereoscopy , 1994, Perception.

[21]  Gustav Theodor Fechner,et al.  Elements of psychophysics , 1966 .

[22]  Hideko F. Norman,et al.  The perception of length on curved and flat surfaces , 2000, Perception & psychophysics.

[23]  A. S. Gilinsky Perceived size and distance in visual space. , 1951, Psychological review.