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13 Cards in this Set
- Front
- Back
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What are the 5 uses of Motion Perception?
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1. detection
2. grouping 3. Distance 4. Shape 5. Heading |
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Detection
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The image of an object must move on the retina or it will disappear.
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Grouping
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Image features that move together tend to be together.
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When fixating on an object in the horizon how fast do cloer and further away objects move?
What doe this motion cue? |
Closer object move faster. Farther away objects move slower.
This is a motion cue to distance. |
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How do you measure motion info?
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- visual latency
- motion measurement mechanisms - correspondence problem - aperture problem - brain areas |
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What three factors affect visual latency?
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- contrast
- luminance - spatial frequency |
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As contrast is increased what happens to response latency?
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response latency decreases
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Pulfrich effect
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when the intensity is lower there is a lag in perception.
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The higher the spatial frequency the ________ you see the target.
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longer it takes
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Mechanisms for motion measurement
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- delayed summation
- feature tracking - motion blur - combining motion components |
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Delayed summation
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combining two neurons with two receptive fields that ae looking at slightly different places. One is slower t respond than the other. The combine neuron should respond in optimal conditions.
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Aperture Problem
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the receptive field only looks at a small area. You can not see that an object is moving in a certain way if it takes up the same amount of space it did before it moved.
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Motion Blur
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is dumb.
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