9Perception08 - Perception What is Perception Sensation A...

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Perception
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What is Perception? Sensation: A message that our brain receives from one of the senses. Perception: Process of using prior knowledge and experience to interpret and make sense of these sensations
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Sensation
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Perception
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Visual Object Agnosia “A convoluted red form with a linear green  attachment...” The What and Where Pathways
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The What and Where Pathways PROSOPAGNOSIA
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Damage to “Where” Pathway Tracking Grasping The What and Where Pathways
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Video clip – What and Where Pathways The Brain #9
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“Bottom Up” Data Assembly “Top Down” Theory Testing Perception Sensation
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Top-down vs. Bottom-up Processing So far, we have studied the flow of information from the world into the perceptual system (bottom-up processing). But there is an equally important influence of pre-existing knowledge on our eventual perception of things in the world (top-down processing). That is, our prior experiences and expectations have a very strong influence on the things we see. As a result, our perceptions of the world result from a combination of sensory information (data-driven) and pre-existing knowledge (concept-driven) .
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More Top-Down Processing What is this sentence? 5. Hxw xbxux txix oxe, ix wxixh xvxrx oxhxr xextxr xs xoxe?
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More Top-Down Processing 1. This sentence is very easy to read, but it is not just because you can see all of the letters in each word. 2. This sxntence is missixg a few letxers, but it can be read wxth little extra exfort. 3. In txis sxntexce, exery xourxh lexter xas bxen rxplaxed wxth ax x, bux you xan sxill xead xt. 4. Cax yox rexd txis xenxenxe, ix whxch xvexy txirx lextex is xisxinx? 5. Hxw xbxux txix oxe, ix wxixh xvxrx oxhxr xextxr xs xoxe?
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Top-Down Processing Each sentence provides a context of meaning for inferring the meaning of the incomplete words in the next sentence.
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Prior knowledge guides vision
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Prior knowledge guides vision
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