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Psyc2320
Midterm II Review
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Physiological Depth Cues
– Accommodation
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Physiological Depth Cues
– Convergence
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crossed convergence uncrossed convergence
Large angle of convergence Small angle of convergence
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HOROPTER
FIXATION POINT
Anything closer than the fixation point is in a crossed disparity
Binocular disparity
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HOROPTERFIXATION POINT
Anything farther away than the fixation point is in an uncrossed disparity
Binocular disparity
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RIGHT EYE LEFT EYE
If you uncross convergence, your right eye gets these faces shifted slightly to left, left eye gets them shifted to right = CROSSED DISPARITY
AutostereogramsAny repeating objects that have a spacing different from the background will have either crossed or uncrossed disparity
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RIGHT EYE LEFT EYE
If you uncross convergence, right eye gets these faces shifted slightly to right, left eye gets them shifted to left = UNCROSSED DISPARITY
AutostereogramsAny repeating objects that have a spacing difference from the background will have either crossed or uncrossed disparity
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Question 1
What is the difference between a stereogram and an autostereogram?
In a stereogram there is a plate in-between the viewers eyes, forcing him into uncrossed convergence
In an autostereogram there is no external aid to help the viewer in to uncrossed convergence; the viewer has to disconnect the accommodation/convergence reflexes
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Question 2
What is parallax?
Points at different locations in the visual field move at different speeds depending on their distance from fixation
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Question 3
Fill in:Crossed convergence shifts right eye’s image
slightly to the _______ and the left eye’s image slightly to the _______
LEFTRIGHT
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Autostereograms
Left Eye’s Image
Right Eye’s Image
Crossed convergence shifts right image to the right of the left image and vice versa:
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Autostereograms
Left Eye’s Image
Right Eye’s Image
Crossed convergence shifts right image to the right of the left image and vice versa:
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Autostereograms
Left Eye’s Image
Right Eye’s Image
Crossed convergence shifts right image to the right of the left image and vice versa:
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Question 3
Fill in:Crossed convergence shifts right eye’s image
slightly to the _______ and the left eye’s image slightly to the _______
Uncrossed convergence shifts right eye’s image to the ______ of the _____ eye and vice versa
LEFTRIGHT
LEFT LEFT
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Autostereograms
Left Eye
Right Eye
Uncrossed convergence shifts right-eye’s image to the left of the left-eye image and vice versa:
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Autostereograms
Left Eye
Right Eye
Uncrossed convergence shifts right-eye’s image to the left of the left-eye image and vice versa:
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Autostereograms
Left Eye
Right Eye
Uncrossed convergence shifts right-eye’s image to the left of the left-eye image and vice versa:
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Question 4 Which is correct?a) Head is accelerated in the direction of the blue arrowb) Head is accelerated in the direction of the red arrow
Cupula
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Question 4 Which is correct?a) Head is accelerated in the direction of the blue arrowb) Head is accelerated in the direction of the red arrow
Cupula
Fluid goes this way
Head accelerates this way
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Question 5
• Where on the tongue is the taste receptor for ‘bitter’ located?
Distributed evenly across the tongue surface with the exception of on the filiform region
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Question 6
Which perception is associated with these physical properties of light?
IntensityFrequencyPolarization
BrightnessColorNot sensed by humans
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Question 7What happens when we move the reference lap...
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Question 7What happens when we move the reference lap...
....here???
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Question 7
The viewer will perceive the light coming from the lamp as being moved further back in a 3D image
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Question 8
What do you get if you use a prism to combine all wavelengths of light?
WHY?
What do you get if you mix a bunch of light?
WHY?
WHITEAll the wavelengths are added together. When they are all reflected at the same time, you see white
BLACK
The pigment in paint SUBTRACTS the different wavelengths – with enough pigments mixed, all the wavelengths are ‘absorbed’ and you see it as black
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Question 9
How do we see color in a dim setting?
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Question 9How do we see color in a dim setting?a) We perceive color not based on absolute wavelengths, but based on the wavelengths available to us
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Question 9How do we see color under different illumination conditions?
b) COLOR CONSTANCY
The ‘color’ of objects is independent of the ambient light. The color of an object is perceived as the same under different lighting conditions to aid in object recognition and identification
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Question 10
What is size constancy?
Perceived size of an object is adjusted according to perceived distance (based on other cues)