Chapter 2 Part 2 Flashcards
1
Q
Visual Agnosia
A
Disorder or object recognition that is not due to sensory or memory problems
2
Q
Visual Agnosia Video
A
- In video the guy had to touch and smell the objects to identify them
- He could pick up the apple and crayon accurately
- Displays what vs where pathways distinction
- Ventral stream disorder
- Results from brain damage, strokes, aneurisms, carbon monoxide poisoning
3
Q
Apperceptive Agnosia
A
- cannot recognize objects visually
- cannot copy drawings
- cannot discriminate between objects (or shapes)
- in less sever cases patients may have shape constancy issues
- complete failure of object recognition
- damage in early visual processing
4
Q
Unusual-Views Test
A
- Test for shape constancy issues
- Recognize the objects as the same rather than the same
- No two people tend to present exactly the same
5
Q
Associative Agnosia
A
- can discriminate and copy objects they see, but cannot recognize them
- brain appears to correctly identify the object, but this information cannot be linked to stored (semantic) information about the object
- can tell the difference between objects however can’t tell what the objects actually are
- damage later in the visual processing
6
Q
Associative Visual Agnosia Color Example
A
- Asked to color the black and white images in
- Could not identify the objects
- But they could color in the separate objects
- Associative visual agnosia
- Knows what the objects are but can’t connect knowledge about the objects
7
Q
Associative Visual Agnosia Video Example
A
- Can discriminate between shapes and sizes
- Hands know what to do with the object
- Associative agnosia
8
Q
Integrative Agnosia
A
- can perceive parts of objects, but cannot perceive “the whole”
- you would see eyes, ears, nose, and not a whole face
9
Q
Category-Specific Agnosia
A
- animate-inanimate (living vs non-living)
- prosopagnosia
- difficulty identifying faces; face blindness
- not all have the same degree of deficits for all types of objects
- word blindness
10
Q
Test for Integrative Agnosia
A
- The lines show the order of the lines drawn
- They did not recognize it as a diamond and circles
11
Q
Category Specific Agnosia Test
A
- Animate vs inanimate
- More trouble with living objects than non-living objects
- Could do the keys
- Could not do the dog
- Suggests that there are separate areas of the brain for animate recognition and inanimate recognition
- Task difficulty
12
Q
Sensorimotor Hypothesis for Category-Specific Agnosia
A
- Distinction has more to do with how we develop knowledge about the objects
- When its an object that we use we learn about the object in a series of sensorimotor tactile interaction i.e. using, holding, touching
- Not as much sensorimotor information like seagulls, only learned about visually
- Multiple areas vs one area
- Damage to vision you have trouble identifying seagulls because vision was the only association
- Damage to vision you can still identify using sensory and motor associations
13
Q
Prosopagnosia
A
- Areas of the brain are very specific in their responses to faces
- Superior temporal sulcus
Very close to auditory neurons so it is unexpected
14
Q
Fusiform Face Area (FFA)
A
- Along inferotemporal ventral stream
- Fusiform gyrus
- Very specific to faces
15
Q
Are Faces Special Kinds of Objects? Yes
A
- Evolutionary justification
- Faces are super important for humans
- Related, known, strangers
