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Chapter 4, psych


undefined, object
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Middle Vision
-The stage in visual processing responsible for combining features into objects (groups)
-After extraction of basic features
-Before object recognition
Illusory contours
Edges perceived despite lack of physical evidence for them
Perceptions are simply the sums of sensations, can understand complex objects by analyzing their components.
Gestalt Theory
The perceptual whole is greater than the sum of its sensory parts.
Texture segmentation
-carving an image into regiions of common texture properties
Gestalt grouping principles (8)
- similarity
- proximity
- common fate
- good continuation
- common region
- connectedness
- closure (things that are not convex)
- deep concavities
Ambiguous figures
generates two or more plausible interpretations (Necker Cube)
Accidental viewpoint
produces regularity in image that is not present in the real world
Figure-ground segregation
process of determining which feature belongs to foreground and background
What becomes a figure?
- convex regions
- smaller region
- moving region
- symmetric/parallel region
- nearer region
degree to which two line segements appear to be part of the same contour
nonaccidental features
not dependent on accidental viewpoint or observer
Global superiority effect
Properties of whole object take precedence over properties of parts of the object
Grand organizing principles:
1. Pragnaz (Gestalt): driven to experience things as simple as possible
1. Likelihood (Helmholtzean principle): organization chosen to correspond to most likely distal layout, context
Template theory
Lock and key, match template (problem is you would need an infinite number of templates)
Structural description
In terms of natures of constituent parts and relationships between those parts
"recognition by components" model/ geon theory
-recognized by identities and relationships of component parts
-items built out of geometric ions
Ability to recognize objects as a face and recognize specific faces are distinct
Grandmother Cell
-any cell that seems to be selectively responsible to one specific object
Extrastriated Cortex:
-borders primary visual cortext
-involved in middle vision tasks
Visual information moves out along two paths:
1. pariental lobe (where)
2. temporal lobe (what)

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