Pain PerceptionPain ThresholdPainPain MeasurementPerceptionPain ManagementSensory ThresholdsChronic PainNociceptorsHyperalgesiaThermosensingPain, PostoperativeFacial PainAnalgesiaTranscutaneous Electric Nerve StimulationNociceptive PainAnalgesicsLow Back PainHot TemperaturePhysical StimulationPain, ReferredBack PainNeck PainFibromyalgiaNociceptionNeuralgiaAcupuncture AnalgesiaAnalgesics, OpioidAbdominal PainPain, IntractableSensationPressureLidocainePelvic Painbeta-EndorphinPain Insensitivity, CongenitalEar, ExternalEvoked Potentials, SomatosensoryDental Pulp TestAcute PainCold TemperatureAnesthetics, LocalMyofascial Pain SyndromesVisual PerceptionAcupuncture PointsDouble-Blind MethodAnalysis of VarianceMorphineElectric StimulationTime FactorsToothacheHypesthesiaChronic DiseaseMotion PerceptionQuestionnairesShoulder PainWristMusculoskeletal PainAnalgesics, Non-NarcoticLasersSpeech PerceptionSocial PerceptionDifferential ThresholdPlacebo EffectSensory System AgentsCross-Over StudiesAuditory ThresholdBehavior, AnimalSpinal CordElectric Stimulation TherapyReaction TimeAcupuncture TherapyHyperesthesiaNerve Fibers, UnmyelinatedSomatosensory DisordersAnxietyBrainSomatosensory CortexDepth PerceptionAfferent PathwaysMagnetic Resonance ImagingVibrationTreatment OutcomeElectroacupunctureSkinAuditory PerceptionIrritable Bowel SyndromeMicrovascular AnginaTemporomandibular Joint Dysfunction SyndromeCatechol O-MethyltransferaseForm PerceptionTouchSkin TemperatureWhiplash InjuriesRadial NervePsychophysicsMigraine DisordersRats, Sprague-DawleyFormaldehydeCapsaicin