Vision - Pathways and Brain Flashcards Preview

Physiology 2130 > Vision - Pathways and Brain > Flashcards

Flashcards in Vision - Pathways and Brain Deck (14):

What is our visual field

Everything we see from both eyes


What is binocular vision

When you can see only whats in front of you (right and left visual fields overlap)
Your left and right visual fields are gone


What is monocular vision

Is the portion of the visual field associated with only one eye
Either left or right peripheries


What crosses at the optic chiasm

ganglion cell axons originating from nasal retina cross the contralateral side


Why do nasal fibers cross

Left brain sees right side and right brain see left side
-left side of each retina has to go to the left hemisphere


Is temporal retina contralateral or ipsilateral



What happens when you cut the optic nerve

You will love the monocular vision (peripheries) for one eye being cut (cut left optic nerve will lose left periphery)


What happens when you cut the optic chiasm vertically

Will lose monocular (peripheries) on both sides resulting in binocular vision (aka tunnel vision)


What happens when you cut the optic tract

Will lose the entire contralateral visual field
(same as covering one eye with your hand)


Why is the Primary visual cortex important (V1)

It is the 1st place in the brain where cells receive signals from both eyes
-has 6 stratified layers


What was the Hubel and Wiesel experiment

-Spots of light stimulate ganglion cells
-Sliding a slit of of light across the visual field caused neurons to discharge
-found that neurons respond best to bar like stimuli with specific orientation


What are the 2 parallel processing streams in the visual cortex

Dorsal Stream
Ventral Stream


What is the dorsal stream

Where and how pathway
In the parietal cortex
Spatial analysis
Visual control of movement


What is the ventral stream

What pathway
Temporal cortex
Object and pattern identification