MuscimolGABA AgonistsGABA-A Receptor AgonistsReceptors, GABA-ABicucullinegamma-Aminobutyric AcidGABA AntagonistsBaclofenMicroinjectionsReceptors, GABAFlunitrazepamCerebellar NucleiPicrotoxinGABA-A Receptor AntagonistsReceptors, GABA-BRats, Sprague-DawleyNipecotic AcidsOxazolesDose-Response Relationship, DrugMedulla OblongataGABA AgentsGABA-B Receptor AgonistsRats, Long-EvansPentobarbitalPonsSecobarbitalIsoxazolesDiazepamPregnanoloneGABA ModulatorsBehavior, AnimalChlormethiazolePregnanedionesInjections, IntraventricularNeuronsAutoradiography