The Effect of Similarity between Line Segments on the Correspondence Strength in Apparent Motion

Perception ◽  
1980 ◽  
Vol 9 (6) ◽  
pp. 617-626 ◽  
Author(s):  
Shimon Ullman
Keyword(s):  
Apparent Motion ◽  
Dimensional Space ◽  
Three Dimensional ◽  
Length Ratio ◽  
Line Segments ◽  
Orientation Difference ◽  
Three Dimensional Space

The correspondence between line segments in apparent motion is shown to be affected by the similarity between them. Increase in orientation difference or in length ratio between lines in a competing motion configuration decreases the probability of perceived apparent motion between them. The results suggest the existence of a built-in preference metric that may reflect a measure of matching likelihood between elements in three-dimensional space.

scholarly journals Self-Assembly of Polyhedral Hybrid Colloidal Particles

2008 ◽  
Vol 1135 ◽  
Author(s):  
Adeline Perro ◽  
Etienne Duguet ◽  
Serge Ravaine ◽  
Vinothan N. Manoharan
Keyword(s):  
Self Assembly ◽  
Colloidal Particles ◽  
Dimensional Space ◽  
Three Dimensional ◽  
High Yield ◽  
Complex Geometries ◽  
Hybrid Particles ◽  
Line Segments ◽  
Very High ◽  
Three Dimensional Space

ABSTRACTWe have developed a new method to produce hybrid particles with polyhedral shapes in very high yield (liter quantities at up to 70% purity) using a combination of emulsion polymerization and inorganic surface chemistry. The procedure has been generalized to create complex geometries, including hybrid line segments, triangles, tetrahedra, octahedra, and more. The optical properties of these particles are tailored for studying their dynamics and self-assembly. For example, we produce systems that consist of index-matched spheres allowing us to define the position of each elementary particle in three-dimensional space. We present some preliminary studies on the self-assembly of these complex shaped systems based on electron and optical microscopy.

scholarly journals Transversals to Line Segments in Three-Dimensional Space

2005 ◽  
Vol 34 (3) ◽  
pp. 381-390 ◽  
Author(s):  
H. Brönnimann ◽  
H. Everett ◽  
S. Lazard ◽  
F. Sottile ◽  
S. Whitesides
Keyword(s):  
Dimensional Space ◽  
Three Dimensional ◽  
Line Segments ◽  
Three Dimensional Space

The Tactile Quartet: Comparing Ambiguous Apparent Motion in Tactile and Visual Stimuli

Perception ◽  
2019 ◽  
Vol 49 (1) ◽  
pp. 61-80 ◽  
Author(s):  
Harry H. Haladjian ◽  
Stuart Anstis ◽  
Mark Wexler ◽  
Patrick Cavanagh
Keyword(s):  
Motion Perception ◽  
Apparent Motion ◽  
Index Finger ◽  
Dimensional Space ◽  
Visual Stimuli ◽  
Three Dimensional ◽  
Two Dimensional ◽  
Different Depths ◽  
Three Dimensional Space

In the visual quartet, alternating diagonal pairs of dots produce apparent motion horizontally or vertically, depending on proximity. Here, we studied a tactile quartet where vibrating tactors were attached to the thumbs and index fingers of both hands. Apparent motion was felt either within hands (from index finger to thumb) or between hands. Participants adjusted the distance between their hands to find the point where motion changed directions. Surprisingly, switchovers occurred when between-hand distances were as much as twice that of within-hand distances—a general bias that was also found for tactile judgments of static distances. This expansion of within-hand felt distances was again seen when lights were placed on the hands rather than vibrating tactors. Importantly, switchover points were similar when the hands were placed at different depths, indicating that representations governing tactile motion were in perceptual three-dimensional space, not retinal two-dimensional space. This was true whether the quartets were visual stimuli on the hands or were purely visual on a monitor, suggesting that proximity is generally determined in three-dimensional coordinates for motion perception. Finally, the similarity of visual and tactile results suggests a common computation for apparent motion, albeit with different built-in distance biases for separate modalities.

Extension of the Spatial PDI Model to Three Dimensions

1997 ◽  
Vol 84 (1) ◽  
pp. 176-178
Author(s):  
Frank O'Brien
Keyword(s):  
Population Density ◽  
Dimensional Space ◽  
Finite Lattice ◽  
Three Dimensional ◽  
Upper Bounds ◽  
Three Dimensions ◽  
Lower And Upper Bounds ◽  
Density Index ◽  
Three Dimensional Space

The author's population density index ( PDI) model is extended to three-dimensional distributions. A derived formula is presented that allows for the calculation of the lower and upper bounds of density in three-dimensional space for any finite lattice.

A Peptoid with Extended Shape in Water

2019 ◽  
Author(s):  
Jumpei Morimoto ◽  
Yasuhiro Fukuda ◽  
Takumu Watanabe ◽  
Daisuke Kuroda ◽  
Kouhei Tsumoto ◽  
...  
Keyword(s):  
Spectroscopic Analysis ◽  
Dimensional Space ◽  
Three Dimensional ◽  
Biomolecular Recognition ◽  
Biological Application ◽  
New Class ◽  
Proteolytic Resistance ◽  
Pharmacokinetic Properties ◽  
Optically Pure ◽  
Three Dimensional Space

<div> <div> <div> <p>“Peptoids” was proposed, over decades ago, as a term describing analogs of peptides that exhibit better physicochemical and pharmacokinetic properties than peptides. Oligo-(N-substituted glycines) (oligo-NSG) was previously proposed as a peptoid due to its high proteolytic resistance and membrane permeability. However, oligo-NSG is conformationally flexible and is difficult to achieve a defined shape in water. This conformational flexibility is severely limiting biological application of oligo-NSG. Here, we propose oligo-(N-substituted alanines) (oligo-NSA) as a new peptoid that forms a defined shape in water. A synthetic method established in this study enabled the first isolation and conformational study of optically pure oligo-NSA. Computational simulations, crystallographic studies and spectroscopic analysis demonstrated the well-defined extended shape of oligo-NSA realized by backbone steric effects. The new class of peptoid achieves the constrained conformation without any assistance of N-substituents and serves as an ideal scaffold for displaying functional groups in well-defined three-dimensional space, which leads to effective biomolecular recognition. </p> </div> </div> </div>

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