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Psych 101 Prof. Rowekamp Vision and Color Contrast Vision is dependent on not only the eye, but also the brain. Incoming light hits the retina and the information works its way back through the rods and cones. It then goes through the bipolar cell layer and ganglion nerves before following the optic nerve to the occipital lobe. Knowing this, David Hubel and Torsten Wiesel discovered that vision seems to be a series of lines and shaded areas. They used animal research in their experiments to support their theories. Recently, scientists at Durham University were able to prove a similar idea through the use of human subjects. By using patients with brain damage to their visual cortex, these scientists were able to confirm that Hubel and Wiesel were correct in assuming that their results in animals transferred to human sight. Hubel and Wiesel developed the idea of feature detectors, certain cells that respond
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Unformatted text preview: maximally to specific images on retina. For example, in class we discussed when we see the shape T. The brain goes through its catalog of figures that T has and selects those. It is then able to discern from shapes similar to T like P and R that the shape we are looking at is in fact, the letter T. At some level, our brain goes through this process very quickly. The recent research brings more credence to the work done originally by Hubel and Wiesel, although it should not be considered the end-all and be-all on the topic. It is difficult to devise tests for patients with normally functioning brains, and this study used a single patient to get its results. In situations like this, there is no way to know if this particular patient gave atypical results, or it these same results could be expected from multiple subjects....
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This note was uploaded on 05/05/2008 for the course PSYCH 101 taught by Professor Rowekamp during the Spring '08 term at Xavier.

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