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30 Cards in this Set
- Front
- Back
Dorsal Pathway
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Important in processing info about where items are located and how they might be acted on..guiding actions such as grasping
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Ventral Pathway
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Temporal lobes.
Processes info that leads to recognition and identification of objects. |
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Visual Field
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Portion of the wolrd that is visible at the present moment
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FOVEA
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A part of the retina that can collect detailed information.
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Bottom-Up Processing
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Taking info from the world and building upon it.
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Top-Down Processing
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Taking info that we already have and using it to interpret what you experience. driven by goals
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Perception
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Taking in information about the world and making sense of it.
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Cones
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pick up colour
3 types of cones: 1. blusih light 2. greenish light 3. yellowish-green light (perception to red) |
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Grouping Principles
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Guide the visual system and produce our perception of what goes with what
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Proximity
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Things that are closer together are more likely to be grouped together
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Uniform Connectedness
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Linked or vertical organisation---colums. overrides proximity.
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Similarity
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Things are grouped together based on how similar they are (such as colour, shape, etc.)
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Closure or Line Termination
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Group things together in columns
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The Binding Problem
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How do we associate different features (colour, shape, orientation, etc.) so that we perceive one object?
-one system analyses colour, another movement, etc. |
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Spatial Location
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Can serve as the glue to the bingind problem. if shape, colour, motion all occupy the same space, then it seems reasonable that they would be bound together
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Recognition
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The process of matching representations of organised sensory input to stored representations in memory.
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AGNOSIA
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People who have no sensory defecit (can hear, see, taste, etc.) but cannot readily recognise objects around them.
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Models of Recognition: VIEWPOINT DEPENDENCE
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objects look different from different angles
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Models of Recognition: EXEMPLAR VARIATION
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There are many different instances of a category (number of different shaped/size chairs)
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Template Matching Model
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Match the whole image to a stored representaion of the whole object. (A template is a pattern that can be used to compare indiv. items to a standard)
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Feature Matching Model
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Extract important or discriminating features from the image and match these with known features of objects.
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RBC (Recognition-By-Components) Model
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Represents the 3-D structure of objects by specifying their parts and the spatial relation among the parts.
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The 1st stage of visual analysis?
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Detect edges and colours
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Geons
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Part of the RBC model. There are 24 (ex: cones, cylinders, etc.). they are 3-D geometrical shapes that can be used to represent any object. They are viewpoint independent.
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Propagnosia
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The inability to recognise different faces.
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Interpreting Information: CONTEXT
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Information is interpreted relative to the context
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Word Superiority
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The context of surrounding letters can manipulate the perception of a target letter.
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Brightness Constancy
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Our ability to see objects as continuing to have the same brightness even though light may change their immediate properties.
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Size Constancy
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Our perceptions of the size of objects are relatively constant
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Edge Detection
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The process of identifying and locating sharp discontinuites in an image
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