# Sensation

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1. Monocular Cues to 3d space
• Relative size
• Relative height
• Familiar size
• Aerial perspective
• Linear perspective
• Vanishing point
2. Relative Size
we assume that smaller objects are farther away from us than larger objects
3. Relative Height
• Below horizon objects higher in vidusl field appear to be farther away
• Above horizon objects lower in visual field appear to be farther away
Items of same size from smaller images when they are farther away
5. Familiar Size
a cue based on knowledge of the typical size of object
6. Aerial Perspective
• light scatters when it travels through the atmosphere
• This scattering of light makes distant objects look fainter, blue, and less distinct than close objects
7. Linear perspective
lines that are parallel in the 3d world will appear to converge in a 2d image
8. Vanishing point
point at which parallel lines will meet
9. Pictoral Depth Cue
A cue to distance or depth used by artists to depict 3d depth in 2d pictures
10. Anamorphosis
use of pictoral depth cues to create a 2d image that looks 3d only when viewd from a particular image
11. Motion Parallax
relative motion of objects provides distance information.
12. 2 parts to motion parallax
• 1a. objects in front offixation point move in the opposite direction to you
• 1b. objects behind fixation point move in the same direction as you
• 2. Objects closer to fixation point move more slowly than objects farther from our fixation point
13. Accomodation
• The amount ofmuscle contraction needed to change shape of the lens
• gives us distance information
14. 2 Binocular cues
• 1. convergence
• 2. binocular disparity
15. Convergence
• amount of muscle tension used to move eyes to an object
• can be used as a distance cue
• close toobservation
16. Binocular disparity (stereopsis)
• Each eye sees a slightly different view of the world
• This difference is a distance cue
• The red line is exactly the same distance from fovea
17. Horopter
the area of space where other objects will also fall on corresponding points
18. Corresponding points
the retinal images of a single object are formed at the same distance from the fovea in each eye
19. The horoptor has three different situations
• 1. corresponding points
• 2. non corresponding points
• 3. panum's fusion area
20. Non corresponding points
• objects that do not fall on the horopter create non corresponding points on each retina
• The further away, the more disparity (blurry)
• double vision
21. Panum's Fusion Area
• Small region surrounding horoptor
• in PFA objects fall on non corresponding points, yet dont create double images
22. Objects that arent on the horoptor or not in PFA will produce;
double images
23. Crossed Disparity
• Created by objects in front of the horoptor
• Images in front of horoptor are displaced
• --To the left of the fovea in the right eye
• --To the right of the fovea in the left eye
• This doesnt happen when image is gehind horoptor its more orderly
24. Uncrossed disparity
• Created by objects behind horoptor (there is no crossing disparity in eyes)
• Images behind the horoptor are displaced...
• --The right of fovea in the right eye
• --The left of fovea in the left eye
• (Finger test - 1 farther away/1 closer)
25. 3d glasses
• Anaglph glasses
• Polarized glasses
• Shutter glasses
26. Anaglph glasses
cheap blue and red glasses
27. Polarized glasses
• puts color back in to the film
• Subtract all light waves that are coming from one direction
28. Free Fusion
Converging (crossing) or diverging (uncrossing) the eyes in order to view a stereogram without a stereogram
29. Stereoblindness
• Inability to use binocular disparity as a depth cue
• Cant see the picture inside the magic eye picture
• --Can result from a childhood visual disorder, such as strabismus, in which the 2 eyes are misalligned
30. 3 types of Binocular Disparity Cells
• 1. No binocular disparity
• 2. Crossed disparity
• 3. Uncrossed disparity

A cell only responds to a certain kind and amount of disparity
31. Combining depth cues:
Illusions and the Construction ofspace
• our visual systems take into account depth cues when interpreting the size of objects
• The hering illusion
• Ames Room-2 teddy bears
• Ames window
• Muller-Lyer illusion (arrows)
32. Ponzo Illusion
man on train tracks-actually the same size
33. Reversible Figures/Unstable Figures
• pictures that can be taken two or more different ways
• *Nesser cube
• *Duck rabbit
• *Seeing black outline figure in a vase
• *Tessellation
34. Impossible Figures
• Elephant with too many feet
• Never ending staircase
• WEird triangle
• Figures that could never happen or be built/done

## Card Set Information

 Author: Anonymous ID: 111782 Filename: Sensation Updated: 2011-10-24 21:26:39 Tags: Chapter6 Folders: Description: Space perceptiom & Binocular Vision Show Answers:

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