Swine Notes - Swine Notes! Friday, September 4 Our sensory...

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Swine Notes! Friday, September 4 Our sensory and perceptual processes work together to help us sort out complex images. To represent the world, we must detect physical energy (stimulus) from the environment and convert it into neural signals, a process called sensation. When we select, organize, and interpret our sensations, the process is called perception. Sensation provides the raw information that perceptions constructs into our experiences. Analysis of the stimulus begins with the sense receptors and works up to the level of the brain and mind. – Basically when we look at something, we see a chunk of symbols and shapes, that we then put together to make sense of it. If you look at this symbol of an A – our brain first decodes it into 3 separate lines, which we have been taught over and over that when put together makes an A. Bottom up processing takes everything at its smallest parts and slowly builds up to the whole picture. Information processing guided by higher-level mental processes as we construct perceptions drawing on our experience and expectations. So, we basically know what to expect and then we make the puzzle pieces fit. Gustav Fechner studying the connection between physical energy and the psychological experience. As part of his research, he would stare at the sun for a brief period of time. Afterwards he discovered an afterimage (blue). So, he began to spend all of his time studying this phenomenon. Unfortunately, he was the first guy to prove that staring at the sun will cause you to go blind and have a mental breakdown. So, after his breakdown he spent a very long time in a dark room trying to recoop. Once he could see again without pain, he walked outside into his garden and noticed that the flowers were more intensely colored than he had ever remembered. Fechner began trying to show that there was a mathematical link between intensity and sensation. Basically, an increase in mental intensity could be measured in terms of the physical energy required to bring it about. But, he could only measure the stimulis intensity directly. He couldn’t measure the psychological intensity or strength because it was different for everyone. Finally, he realized he could do it indirectly using that sensitivity as a guide. So, he would determine the smallest increase in stimulus strength that would just barely be noticeable to the subject. So, he developed something called JND – just noticeable difference .
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Absolute Threshold : Minimum stimulation needed to detect a particular stimulus 50% of the time. This JND (AKA the difference threshold) showed the Minimum difference between two stimuli required for detection 50% of the time. Selective attention
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This note was uploaded on 04/20/2011 for the course PSYCH 101 taught by Professor Sabin during the Spring '09 term at Saint Louis.

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Swine Notes - Swine Notes! Friday, September 4 Our sensory...

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