NEUR 2600 Lecture Notes - Lateral Geniculate Nucleus, Two-Streams Hypothesis, Visual Cortex

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19 Mar 2013
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Cortical visual anatomy
1.
ON-off center surround cells
2.
Orientation detections
3.
Visual development
4.
Visual Coding
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The Geniculostriate System
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Left - right visual cortex
Cross half the fibers from each eye to each side
Right - left visual cortex
The visual field for the bunny is just the area of the right visual field
Sees a certain part of your world
Find what it responds to, must find what its visual field is
Every cell has a visual field
If below the clacarine fissure, the blind spot is
in the upper quadrant
A stroke in a right visual cortex produces a blind spot in
the left visual field
It is upside down and backward
Visual field projects onto a visual map, and so has a topographic
representation
Only excite a small part of the retina, which will only excite a small part of
the visual cortex
The ventral stream but not the dorsal stream functions under anesthesia
Inhibition and excitation - the two response modes of neurons
Break the side down smaller
The bigger the circle, the more discharge
On off center surround cells
If you put a light in the centre of the screen and indicate when the cell
discharged
Red green
Blue-yellow
All ganglion cells and all lateral geniculate body (LGB) cells
are on-off or off-on center surround cells
1.
On-off or off-on center surround cells code for the above
colors
2.
Black-white
Some cells respond to color
The explanation for center surround cells -it's the wiring at
the level of the retina
Some receptor cells are excitatory or inhibitory
Lateral inhibition
And so any two adjacent fields look at almost the same part of
the world
Found in the optic tract (where you can find AP) and the LGB
The receptive fields of retinal ganglion cells overlap extensively
Cells went on to spots of light or off or both
Stephen W. Kuffler
Concept
Visual Field
-
Visual Coding
March-08-13
11:03 AM
Brain and Behavior Page 1
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Document Summary

Whole dorsal part of the brain is unconscious. Cross half the fibers from each eye to each side. Only excite a small part of the retina, which will only excite a small part of the visual cortex. The visual field for the bunny is just the area of the right visual field. Find what it responds to, must find what its visual field is. Visual field projects onto a visual map, and so has a topographic representation. A stroke in a right visual cortex produces a blind spot in the left visual field. If below the clacarine fissure, the blind spot is in the upper quadrant. The ventral stream but not the dorsal stream functions under anesthesia. Inhibition and excitation - the two response modes of neurons. Cells went on to spots of light or off or both. If you put a light in the centre of the screen and indicate when the cell discharged.

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