Higher-order cognitive functions result from dynamic interactions of distributed networks comprised of anatomically, physiologically, and pharmacologically separate components of the nervous system. To further our understanding the basic mechanisms and functions of such networks, as well as how they are affected by the administration of therapeutic drugs, we have developed a PET-fMRI platform to take simultaneous measurements of neural activity (fMRI), and concentration of dopamine (PET) during the same physiological state, and without the confounding effects of anesthetics. With this platform, we have measured for the first time in a primate brain the effects of administering different doses of methylphenidate on extracellular levels of dopamine and functional connectivity.
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