Seminar 1 - Cognitive Psychology Seminar One Posner M.I...

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Cognitive Psychology Seminar One Posner, M.I., Petersen, S.E., Fox, P.T., & Raichle, M.E. (1988). Localization of cognitive operations in the human brain. Science, 240 , 1627-1631. Ojemann, George. The Physics of Language [YouTube] h tt p :// www . you t ube . co m / w a t ch?v= E e P 14 mM 2 UU 8 & f ea t u r e= r e l a t ed 1. How is PET scanning used to study cognitive processes? PET (positron emission topography) scanning is used to study cognitive processes by allowing brain processes that are active during single word reading to be observed. PET scans allow the average change in cerebral blood flow in localized brain areas during 40 seconds of cognitive activity to be examined. In this experiment, they were concerned with which areas of the brain dealt with visual, semantic, and phonological operations. 2. Use two examples from the article to describe the difference between saying that reading (or some other cognitive activity) is a “strictly localized” cognitive process and saying that “ although the task itself is not strictly localized, the “operations that underlie performance” are strictly localized. One example would be when they explained the changes in blood flow while passively looking at foveally presented nouns. This task produced five areas of activation. All of these operations that go into making this task work are localized in the occipital lobe. Another example would be when phonological coding is discussed. When words are heard, the primary auditory cortex and an area of the left temporoparietal cortex are activated. Both of these operations are localized in the temporoparietal left-lateralized area. 3. Review the Semantic Operations section (p. 1629) and pay careful attention to the methodology described.
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