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Bottoms Up


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             Another concept where we can apply and recognize our perceptual processes is with constancies. Aside from shape, humans can interpret size, color, and brightness constancies. For example, when we see a bird land in front of us, we will apply our concept recognition to determine what it is. We will primarily use our top-down process in this case. Here we expect that a creature of small size that is flying in the air will likely be a bird. Because we have past knowledge in our minds, we know that a bird is a small creature with feathers that can fly. The creature that landed in front of us fits all these traits and therefore it must be a bird. If we were to look at the creature from our bottom-up perspective, we would notice feathers, flight and smallness and determine that it must be a bird. We will then look deeper in context by using our specific color and size constancies to determine what kind of bird it is and the cycle continues. The top-down process often creates problems if we assume one animal is another based on similar characteristics. However generally, we can use our top-down processes to recognize other living creatures with which we interact. .
             I will now apply our perception methods to the concept of heuristics. "Heuristics are mental rules of thumb that permit us to make judgments in a rapid and efficient manner" (Baron, 259). Although these mental shortcuts allow us to save time, they can often lead to errors and false judgments. Lets take the example of data analysis as it relates to the availability heuristic. When people look at statistics involving percentages on how often something is safe or effective, our processes kick in. Our bottom-up process critically examines the visual statistics. They report to our awareness senses on whether or not we will be safe riding on a train or very likely to win the lottery. Our top-down processes reflect what we expect the data to read.


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