Perceived relative distance on the ground affected by the selection of depth information

Our visual space does not appear to change when we scan or shift attention between locations. This appearance of stability implies that the depth information selection process is not crucial for constructing visual space. But we present evidence to the contrary. We focused on space perception in the intermediate distance, which depends on the integration of depth information on the ground. We propose a selection hypothesis that states that the integration process is influenced by where the depth information is selected. Specifically, the integration process inaccurately represents the ground when one samples depth information only from the far ground surface, instead of sequentially from the near to the far ground. To test this, observers matched the depth/length of a sagittal bar (test) to the width of a laterally oriented bar (reference) in three conditions in a full-cue environment that compelled the visual system to sample from different parts of the ground. These conditions had the lateral reference bar placed (1) adjacent to the test bar, (2) at the far ground, and (3) at the near ground. We found that the sagittal bar was perceived as shorter in conditions (1) and (2) than in Condition 3. This finding supports the selection hypothesis, since only Condition 3 led to more accurate ground surface integration/representation and less error in relative distance/depth perception. Also, we found that performances in all three conditions were similar in the dark, which has no depth information on the ground, indicating that the results cannot be attributed to asymmetric visual scanning but, rather, to differential information selection.

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

[2]  J. Loomis,et al.  Visual space perception and visually directed action. , 1992 .

[3]  A. S. Gilinsky,et al.  The effect of attitude upon the perception of size. , 1955, The American journal of psychology.

[4]  Zijiang J. He,et al.  Distance determined by the angular declination below the horizon , 2001, Nature.

[5]  Zijiang J. He,et al.  The linear perspective information in ground surface representation and distance judgment , 2007, Perception & psychophysics.

[6]  George J Andersen,et al.  Perception of Scene Layout from Optical Contact, Shadows, and Motion , 2004, Perception.

[7]  Hideko F. Norman,et al.  The Perception of Distances and Spatial Relationships in Natural Outdoor Environments , 2005, Perception.

[8]  J. Philbeck,et al.  Visual Perception of Location and Distance , 1996 .

[9]  Zheng Bian,et al.  The ground dominance effect in the perception of relative distance in 3-D scenes is mainly due to characteristics of the ground surface , 2006, Perception & psychophysics.

[10]  Brian E. Smits,et al.  Use of interreflection and shadow for surface contact , 2001, Perception & psychophysics.

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

[12]  W C Gogel,et al.  Eye Fixation and Attention as Modifiers of Perceived Distance , 1977, Perceptual and motor skills.

[13]  Zijiang J. He,et al.  Asymmetry in 3-D perceptual organization: Ground-like surface superior to ceiling-like surface , 2000, Perception & psychophysics.

[14]  M. Wagner,et al.  The metric of visual space , 1985, Perception & psychophysics.

[15]  Leslie Welch,et al.  The precision of size constancy , 1992, Vision Research.

[16]  Zijiang J. He,et al.  Perceptual Space in the Dark Affected by the Intrinsic Bias of the Visual System , 2006, Perception.

[17]  Zijiang J. He,et al.  Localizing suspended objects in the intermediate distance range (>2 meters) by observers with normal and abnormal binocular vision , 2010 .

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

[19]  Zijiang J. He,et al.  A distance judgment function based on space perception mechanisms: revisiting Gilinsky's (1951) equation. , 2007, Psychological review.

[20]  John W. Philbeck,et al.  Large errors, but no depth compression, in walked indications of exocentric extent , 2004, Perception & psychophysics.

[21]  Peter Willemsen,et al.  The Influence of Restricted Viewing Conditions on Egocentric Distance Perception: Implications for Real and Virtual Indoor Environments , 2005, Perception.

[22]  J. Philbeck,et al.  Comparison of two indicators of perceived egocentric distance under full-cue and reduced-cue conditions , 1997 .

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

[24]  C. A. Burbeck,et al.  Locus of spatial-frequency discrimination. , 1987, Journal of the Optical Society of America. A, Optics and image science.

[25]  L. Kaufman,et al.  Handbook of perception and human performance , 1986 .

[26]  Zijiang J. He,et al.  The slant of the visual system's intrinsic bias in space perception and its contribution to ground surface representation , 2010 .

[27]  Zijiang J. He,et al.  Stimulus duration and binocular disparity factors in representing the ground surface and localizing object in the intermediate distance range , 2004 .

[28]  J. Philbeck,et al.  Dissociation between location and shape in visual space. , 2002, Journal of experimental psychology. Human perception and performance.

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

[30]  Zheng Bian,et al.  The ground dominance effect in the perception of 3-D layout , 2005, Perception & psychophysics.

[31]  J. Gibson.  The perception of the visual world , 1951 .

[32]  Zijiang J. He,et al.  Visually Perceived Eye Level and Horizontal Midline of the Body Trunk Influenced by Optic Flow , 2005, Perception.

[33]  Zijiang J. He,et al.  Terrain influences the accurate judgement of distance , 1998, Nature.

[34]  J S McCarley,et al.  Sequential priming of 3-D perceptual organization , 2001, Perception & psychophysics.

[35]  R. Toye,et al.  The effect of viewing position on the perceived layout of space , 1986, Perception & psychophysics.

[36]  J. Rieser,et al.  Visual Perception and the Guidance of Locomotion without Vision to Previously Seen Targets , 1990, Perception.

[37]  J. Thomson.  Is continuous visual monitoring necessary in visually guided locomotion? , 1983, Journal of experimental psychology. Human perception and performance.

[38]  J. Gibson.  The Ecological Approach to Visual Perception , 1979 .

[39]  H A Sedgwick,et al.  Distance perception mediated through nested contact relations among surfaces , 2001, Perception & psychophysics.

[40]  M. Braunstein,et al.  Judging Distance across Texture Discontinuities , 2003, Perception.