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Vision Paper

Vision Paper - a visual stimulus Instead they respond to...

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Peter Rehder 714874731 Psych 220 sec 001 Vision Paper The primary visual cortex is located in the rear-most portion of the occipital lobe, behind the secondary visual cortex. The primary visual cortex has three different types of cells: simple cells, complex cells, and end-stopped cells. Simple cells have fixed receptive fields with excitatory and inhibitory zones. Larger amounts of light shined inside the excitatory zones produces a higher response by the cells, whereas more light shined in the inhibitory zones results in less responsiveness. The visual field of simple cells is bar shaped, mostly vertical or horizontal in orientation. If a bar-shaped light is shined on the receptive field, tilting the light diagonally or moving it outside of the field to varying degrees results in a decreased response by simple cells. Simple cells respond to stimuli only in one location. Complex cells differ from simple cells in that they do not respond to the exact location of
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Unformatted text preview: a visual stimulus. Instead, they respond to patterns of light in a particular orientation. Complex cells have a larger receptive field than simple cells. They respond strongly to a stimulus moving perpendicular to its axis. A good example of this would be a horizontal bar moving vertically. Complex cells respond equally throughout a large area. The third type of cell in the primary visual cortex is the end-stopped cell, also known as a hypercomplex cell. End-stopped cells have the largest receptive field of the three cell types. They are very similar to complex cells, except that they have a strong inhibitory area at one end of the receptive field. The cell responds to any bar-shaped pattern of light anywhere in the field as long as the bar does not move into the inhibitory area. I pledge that I have neither received nor given unauthorized assistance on this assignment. Peter Rehder...
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