Chapter 5 Part 1 - Perception (part 1) Today's topics Depth...

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Today’s topics Depth (distance) perception Movement perception Perception (part 1)
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Depth Perception Chapter 5: Perception Depth Perception Judging our distance from (and the relative distance between) the objects we sense The images on our retinas are two-dimensional and depthless like a photograph We extract depth information and experience a three-dimensional world However, our retinal images are different from photographs as well: Our retinal images are continuously changing Our brain receives depth information from TWO sources (the left and right eye) We make use of a variety of depth cues: Binocular cues: cues that require BOTH eyes to receive the cue Monocular cues: cues we can receive with only a single eye
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Binocular Depth Cues: Convergence Chapter 5: Perception convergence Turning the eyes inward to focus on a nearby object The sensations from our eye muscles provide a cue to distance If the object is close, there is a lot of convergence If the object is far away, there is little or no convergence Also considered an oculomotor cue – a cue based on the feelings that occur in the eyes rather than the characteristics of the stimulus hitting the retina Accommodation (the changing in shape of the lens) is also an oculomotor cue
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Binocular Depth Cues: Binocular Disparity Chapter 5: Perception Binocular disparity (aka retinal disparity) The difference in lateral separation between two objects, as seen by the left and right eyes Our two eyes receive slightly different images of the same object As distance between objects increases, retinal disparity increases
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Monocular Depth Cues: Interposition Chapter 5: Perception Interposition (aka “overlap”) When an object is located between the viewer and a second object, partly blocking the view of the second object The object being blocked is perceived as being farther away Very powerful depth cue!
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Monocular Depth Cues: Interposition Chapter 5: Perception
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Monocular Depth Cues: Interposition Chapter 5: Perception
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Monocular Depth Cues: Interposition Chapter 5: Perception
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Monocular Depth Cues: Linear Perspective Chapter 5: Perception Linear Perspective When two lines known to be parallel appear to be coming together, they imply depth The greater the convergence, the greater the perceived depth
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Monocular Depth Cues: Linear Perspective Chapter 5: Perception
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Monocular Depth Cues: Light and Shadow Chapter 5: Perception Light and shadow
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Chapter 5 Part 1 - Perception (part 1) Today's topics Depth...

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