Download - Exam 1 Grade Distribution
Exam 1 Grade Distribution
Mean = ~77
Exam 1 Grade Distribution
Mean = ~77
Note the “ceiling effect”: these grades would have gone here if the max score was more than 100
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Read article by Gregory for ThursdayRead chapter by Pinker for February 28th
Seeing Depth
• The world is 3D, the retina is 2D !
Depth Cues
• Four categories:1.Pictorial2.Physiological3.Motion4.Stereoscopic
Pictorial Depth Cues
– Shadows and Shading
Pictorial Depth Cues
– Retinal image size– far objects smaller than near objects
• Retinal image size– problem: big far things same as close
small things– “solved” by size constancy: Perceived size
is adjusted according to perceived distance (based on other cues)
– forms the basis for several visual illusions
Pictorial Depth Cues
• Retinal image size
Pictorial Depth Cues
• Retinal image size
Pictorial Depth Cues
• Linear perspective
Pictorial Depth Cues
• Texture gradient
Pictorial Depth Cues
• Height in the plane
Pictorial Depth Cues
More Depth Cues
• Pictorial Depth Cues• Physiological Depth Cues• Motion Parallax• Stereoscopic Depth Cues
Physiological Depth Cues
– Two Physiological Depth Cues1. accommodation2. convergence
Physiological Depth Cues
– Accommodation
Physiological Depth Cues
– Convergence
Physiological Depth Cues
– Convergence– small angle of convergence = far away– large angle of convergence = near
– What two sensory systems is the brain integrating?
– What happens to images closer or farther away from fixation point?
Physiological Depth Cues
– Convergence and accommodation are reflexively linked
Under what circumstances might this be a problem?
Motion Depth Cues
– Motion1. Parallax
Motion Depth Cues
– Parallax
Motion Depth Cues
– Parallax– points at different locations in the visual
field move at different speeds depending on their distance from fixation
Muller - Lyer Illusion
Muller - Lyer Illusion