The study of amphetamine (AMPH) induced dopamine (DA) release in bipolar disorder will explore abnormalities in presynaptic dopamine release mechanisms as well as study post-synaptic DA receptors.The general aim of this study is to evaluate potential neurochemical correlates of AMPH challenge in patients with bipolar disorder currently stable on the mood stabilizer--lithium. Patients with bipolar disorder and healthy controls matched for age, sex and ethnic origin will undergo one SPECT experiment with the D2 tracer [123I]IBZM.
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