Drug-receptor interactions are the basis of signal modulation in the brain, yet, in vivo mechanisms of the action of many drugs are not well understood. In this study, we characterize the in vivo profile of a current third generation antipsychotic drug at the D2/D3 dopamine receptor using simultaneous PET and fMRI. The results are compared to full D2/D3 antagonists and agonists profiles and show that functional differences can be distinguished with occupancy-matched fMRI responses.
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