Occipital Lobes - Concepts

Calcarine Fissure

What fissure runs through the middle of the occipital lobe and divides regions of primary visual cortex?

Fusiform Gyrus

What gyrus is on the underside of the brain in the temporal lobe extending back?

V1

Simple cells, complex cells, and blobs are in what area of the visual cortex?

V2

Stripes (thick and thin) and pale zones are in what area of the visual cortex?

Complex Cells

Thick stripes receive projections from what kinds of cells in V1?

Blobs

Thin stripes receive projections from what kinds of cells in V2?

Movement

Thick strips process what?

Colour

Thin strips process what?

Static Form

Pale zones process what?

Lateral Geniculate Nucleus (LGN)

What area does V1 receive input from?

Superior Colliculus

90% of information from the eye goes to the LGN and V1.

Where does the other 10% go?

AIT

Does the PIT or the AIT respond to more complex stimuli?

Ventral Stream

What stream does the LOC provide information about form to?

Dorsal Stream

What stream does the AIP feed information about form and movement to?

Vision for Action, Action for Vision, Visual Recognition, Visual Space, and Visual Attention

What are the five categories of vision?

Left Side of the Face

In neurotypical subjects, what side of a face / visual field do people focus on?

Left Hemisphere

The right visual field gets processed in what hemisphere?

Right Hemisphere

The left visual field gets processed in what hemisphere?

Bitemporal Hemianopia

What disorder of the visual pathway results from lesion to the medial region of the optic chiasm?

Nasal Hemianopia

What disorder of the visual pathway results from lesion to the lateral region of the optic chiasm?

Homonymous Hemianopia

What disorder of the visual pathway results from a complete cut of the optic tract beyond the optic chiasm or complete damage to one LGN or V1?

Quadrantanopia

What disorder of the visual pathway results from lesion to the occipital lobe?

Lower right visual field

Damage above the calcarine fissure in the upper left visual field results in loss of what area of the visual field?

Ventral stream

In the slot test, damage to what visual stream will result in:

* not being able to do the same or different match test
* can grab the object appropriately

Dorsal stream

In the slot test, damage to what visual stream will result in:

* not being able to grab the object appropriately
* can do the same or different match test