Visual Processing Flashcards
Damage to what part of the brain will lead to object agnosia?
Temporal lobe (ventral stream damage)
What is object agnosia?
Inability to determine a shape
Damage to what part of the brain leads to the inability to scale grip to shape, but able to recognize the shape? What is this disorder called?
Parietal damage (dorsal stream)
Visual ataxia
Damage to what part of the brain leads to the inability recognize a shape, but be able to scale grip to the size and shape of an object?
What is this disorder called?
Temporal lobe (ventral stream)
object agnosia
Which visual stream is conscious?
The ventral stream is consciously aware of object size and shape. The dorsal visual stream is unconsciously acting on the size and shape of objects.
What are the three components of the ‘where’ pathway?
- Visual cortex
- MT
- Posterior parietal cortex
What are the 3 components of the ‘what’ pathway?
- Visual cortex
- V4
- Inferior temporal cortex
What are the 4 components of the visual attention pathway?
- Retina
- Superior colliculus
- Pulvinar nucleus
- Posterior parietal cortex
Which visual stream determines object location with disparity?
Dorsal
What is the fast, jerky movement of the eyes called? Which visual stream mediates it?
Saccade.
Dorsal
Object orientation is processed by what visual stream?
Early dorsal stream
What part of the brain recognizes faces? Where is it located?
The fusiform face area. Part of the ventral visual stream and located in the temporal lobe
Would bird experts have a larger or smaller response to birds? Why?
Larger response. Because the ventral visual stream learns to more theroughly process certain stimuli.
What is apperceptive agnosia?
The inability to name objects, a problem with the ventral visual stream and processing form and shape
What is associative agnosia?
A patient cannot accurately label an object or name its function. Eg. incorrectly using a hammer
