NeurochemistryBrain ChemistryDopamineCholine O-AcetyltransferaseCreatineBehavior, AnimalBrainMicrodialysisSerotonin3,4-Dihydroxyphenylacetic AcidAspartic AcidMagnetic Resonance SpectroscopyMethamphetamineTyrosine 3-MonooxygenaseNeurotransmitter AgentsMotor ActivityCorpus StriatumGlutamic Acidgamma-Aminobutyric AcidRats, Sprague-DawleySchizophreniaNeuronsHippocampusAging