NeurochemistryBrain ChemistryDopamineBiochemistryCholine O-AcetyltransferaseCreatineBehavior, AnimalBrainMicrodialysisSerotoninMagnetic Resonance SpectroscopyAspartic Acid3,4-Dihydroxyphenylacetic AcidMethamphetamineTyrosine 3-MonooxygenaseNeurotransmitter AgentsMotor ActivityCorpus StriatumGlutamic AcidRats, Sprague-Dawleygamma-Aminobutyric AcidSchizophreniaNeuronsHippocampusAging