Glossary of Lecture 9

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4 Deficits in object and form recognition:
1. modality specific deficit in recognition
2. not a naming impariment
3. not memory impairment
4. not a deficit in elementary sensation: acuity, brightness percep, color, motion,

The fact that can have different types of agnosia suggests object recognition not __ simple stage
Implication of different types of agnosia:
object recogniztion occurs in a sequence of stages
Apperceptive agnosia: Impairments
1. impaired shape copying
2. impaired shape ID
3. diff judging orientation (horz v vert)
4. Cannot tell boundaries
5. VF defects
6. Domain general: words, objects, faces, etc

Apperceptive Agnosia: what can do:
1. can trace image - misled by stray lines
2. can acurately negotiate path - just not know objects around them
3. domain general - can affect many domains though

Associative agnosia: impairments:
1. impaired recognition of complex forms and objects
2. hard time naming objects
3. impaired linking percept to memory

Assoicative agnosia: what can do
Early visual processing intact:
1. can copy and match
2. simple form recognition ok
3. Stored semantic knowledge intact: verbal description and drawings from memory

What are some (2) things that help assoicative agnosics?
1. helped by context: better w/ real world than isolated images
2. helped w/ object motion - where pathway intact
Integrative Agnosia: Impairments:
1. difficulty integrating part to whole
2. copying in fragmented and labored way
3. Most diff w/ overlapping figures and integrating parts of objects

Integrative agnosia: can do:
1. can name objects visually and by touch
2. can copy but in labored and fragmented way
Stages of visual recognition:
image --> shape coding --> figure/ground feature integration group --> mapping structural description --> semantic knowledge
Image stage of visual recognition:
raw material in visual system
Shape coding of visual recognition:
ability to deterimine local orientations, angles, curves, etcs
Figure/ground feature integration group of visual recognition:
grouping of features to know different boudaries of objects
Mapping structural descriptions of visual recognition:
representations of shapes that are composed of parts and the spatial relations among the parts
Object constancy:
having some understanding of objects, indept of whatever permutations may be assoc w condistions under objects seen
What are the Gestalt Grouping Principles?
simple rules that the visual system has evolved to figure out what goes with what
the four gestalt grouping principles:
1. good continuation: see single shape
2. closure: brain will see unitary figure
3. similarity: group sim things automatically
4. proximity: group things that are close automatically

With certain agnosias certain gestalt grouping principles are no longer use so it is hard to determine __ is __
what is what
Brain sets up the ability to form __ __ __ which is the knowledge of objects in the world through experience
object centered percepts
Understanding of the form of an object centered on the facts of the object itself - basis for object constancy:
structural description/object centered/viewpoint invariant
Apperceptive Agnosia Stage Model part missing:
Shape coding
Early defecits in __ __ in apperceptive agnosia impacts all visual processing after
shape coding
Integrative agnosia stage model part missing:
link from figrue ground feature integration to structural description
Integrative agnosia has probs __/__ parts into wholes
copying relating
Associative agnosia stage model part missing:
link from structural description to semantic knowledge
Assoicative Agnosia is a __ deficit where most stages are intact, it is __ specific and impact the ability to relate __ to knowledge
later, domain, percept

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