Chapter 5 (Module 5.3) - Visual Processing in the Visual Cortex Flashcards
(18 cards)
what is the purpose of the secondary visual cortex (V2)?
it receives information from V1 and processes the information furt and transmits it to additional areas
this stream is usually called the “what” pathway
important for identifying and recognizing objects
ventral stream
this stream is usually called the “how” pathway
important for visually guided movements
dorsal stream
what happens to people with damage to the dorsal stream?
they see objects but they don’t integrate their vision well with their arm and leg movements
what happens to people with temporal lobe damage?
they cannot identify what the objects are but they can use vision to guide their actions
this term refers to the inability to recognize objects despite otherwise satisfactoy vision
visual agnosia
the cellin this cortex learn to recognize meaningful objects
inferior temporal cortex
Suppose someone can describe an object in detail but stumbles and fumbles when trying to walk toward it and pick it up.
Which is probably damaged, the dorsal path or
the ventral path?
The inability to guide movement based on vision implies damage to the dorsal path.
this term refers to the impaired ability to recognize faces
prosopagnosia
this part of the inferior temporal cortexresponds more strongly to faces than anything else
fusiform gyrus
what are the two areas important for motion perception?
- Middle Temporal Cortex (V5)
- Medial Superior Temporal Cortex
The ability to recognize faces correlates with the strength of connections between which brain areas?
Ability to recognize faces correlates with the strength of connections between the occipital face area and the fusiform gyrus.
this term refers to rapid, ballistic movements of the eyes that abruptly change the point of fixation
saccades
The brain has no specialized areas for perceiving flowers, clothes, or food.
For what items does it have specialized
areas?
The temporal cortex has specialized areas for perceiving places, faces, and bodies, including bodies in motion
this term refers to the ability to see objects but unable to see whether they are moving or, if so, which direction and how fast
motion blindness
Under what circumstance does someone with an intact brain become motion blind, and what accounts for the motion blindness?
People become motion blind shortly before and during a saccade because of suppressed activity in area MT
When you move your eyes, why does it not seem as if the world is moving?
Neurons in areas MT and MST respond strongly when an object moves relative to the background, and not when the object and background move in the same direction and speed
when a person experiences prosopagnosia. what part of brain is affected?
fusiform gyrus of the temporal cortex
