Neuroimaging techniques, such as PET, enable scientists to visualize and measure brain activity. Specifically, this type of scan reveals which brain areas are being used for different cognitive tasks. When the various images are pieced together, one can see the pathways for information processing. For example, if someone is processing a visual image while in a PET scanner, a scientist can see the flow of the information sent to the primary visual cortex, and then he or she can view the general pathways as the image is identified and as it moves on to higher-order processing.
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