NeurochemistryNeurobiologyBrain ChemistryDopamineBrainBehavior, AnimalCholine O-AcetyltransferaseCreatineSerotoninMicrodialysisNeurotransmitter Agents3,4-Dihydroxyphenylacetic AcidAspartic AcidMagnetic Resonance SpectroscopyMethamphetamineMotor ActivitySchizophreniaCorpus StriatumNeuronsTyrosine 3-MonooxygenaseGlutamic Acidgamma-Aminobutyric AcidHippocampusRats, Sprague-DawleyAgingDisease Models, AnimalDose-Response Relationship, Drug