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Local features
Shape Representation
Object Representation
What are the three stages of the three stage model of object perception
Apperceptive Agnosia
This type of agnosia results in subjects being unable to group elements or recognise or match objects. The shape representation stage is disrupted.
Associative Agnosia
This type of agnosia results in which the meaning of an object is affected. Subjects can list distinct features. The object representation stage is disrupted. Semantic system impaired.
Simultanagnosia
This agnosia results in an impairment in perceiving and or/recognising more than one object at a time.
Dorsal
Ventral
The two visual systems
Dorsal System
This stream is involved in the guidance of actions and recognising where objects are in space.
Ventral system
This stream is associated with object recognition and form representation.
Prosopagnosia
This type of agnosia results in face blindness.