scholarly journals Prey snapping and visual distance estimation in Texas horned lizards, Phrynosoma cornutum

2004 ◽  
Vol 207 (17) ◽  
pp. 3067-3072 ◽  
Author(s):  
M. Ott
Keyword(s):  
Distance Estimation ◽  
Phrynosoma Cornutum ◽  
Visual Distance ◽  
Horned Lizards

Culture affects visual distance estimation

2010 ◽  
Author(s):  
Tamer Soliman ◽  
Alison E. Gibson ◽  
Arthur M. Glenberg
Keyword(s):  
Distance Estimation ◽  
Visual Distance

Development of tetranucleotide microsatellite loci and a non-invasive DNA sampling method for Texas horned lizards (Phrynosoma cornutum)

2011 ◽  
Vol 4 (1) ◽  
pp. 43-45 ◽  
Author(s):  
Dean A. Williams ◽  
Cory Leach ◽  
Amanda M. Hale ◽  
Kristopher B. Karsten ◽  
Emmanuela Mujica ◽  
...  
Keyword(s):  
Microsatellite Loci ◽  
Sampling Method ◽  
Phrynosoma Cornutum ◽  
Non Invasive ◽  
Dna Sampling ◽  
Horned Lizards

scholarly journals Visual Distance Estimation in Static Compared to Moving Virtual Scenes

2006 ◽  
Vol 9 (2) ◽  
pp. 321-331 ◽  
Author(s):  
Harald Frenz ◽  
Markus Lappe
Keyword(s):  
Virtual Environment ◽  
Visual Motion ◽  
Human Subjects ◽  
Distance Estimation ◽  
Visual Space ◽  
Depth Interval ◽  
Natural Scenes ◽  
Virtual Scene ◽  
Visual Distance ◽  
Control Direction

Visual motion is used to control direction and speed of self-motion and time-to-contact with an obstacle. In earlier work, we found that human subjects can discriminate between the distances of different visually simulated self-motions in a virtual scene. Distance indication in terms of an exocentric interval adjustment task, however, revealed linear correlation between perceived and indicated distances but with a profound distance underestimation. One possible explanation for this underestimation is the perception of visual space in virtual environments. Humans perceive visual space in natural scenes as curved, and distances are increasingly underestimated with increasing distance from the observer. Such spatial compression may also exist in our virtual environment. We therefore surveyed perceived visual space in a static virtual scene. We asked observers to compare two horizontal depth intervals, similar to experiments performed in natural space. Subjects had to indicate the size of one depth interval relative to a second interval. Our observers perceived visual space in the virtual environment as compressed, similar to the perception found in natural scenes. However, the nonlinear depth function we found can not explain the observed distance underestimation of visual simulated self-motions in the same environment.

scholarly journals Effects of sex, age, and season on plasma steroids in free-ranging Texas horned lizards (Phrynosoma cornutum)

2008 ◽  
Vol 155 (3) ◽  
pp. 589-596 ◽  
Author(s):  
Corina L. Wack ◽  
Stanley F. Fox ◽  
Eric C. Hellgren ◽  
Matthew B. Lovern
Keyword(s):  
Phrynosoma Cornutum ◽  
Horned Lizards ◽  
Plasma Steroids ◽  
Free Ranging
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