Dr. Peterson pioneered the use of brain imaging (PET and fMRI) to identify brain regions that contribute to attention, learning, memory and language. He also investigates the effects of disease and brain damage on these cognitive processes. Currently, he has two main areas of interest. The first focus is the development of neural mechanisms underlying cognition. Methods have been developed that allow direct statistical comparison of child and adult imaging data. The second focus is identifying and characterizing fMRI signals related to task organization and executive control. Recently his lab developed a series of seminal papers on functional connectivity mapping with MRI related to the management of motion artifacts, the applications of graph theory and the mapping of network hubs.