Aphasia, Primary ProgressiveAphasiaPrimary Progressive Nonfluent AphasiaMultiple Sclerosis, Chronic ProgressiveAnomiaAphasia, BrocaLanguage TestsAgraphiaAtrophyMultiple Sclerosis, Relapsing-RemittingApraxia, IdeomotorSpeechApraxiasMultiple SclerosisNeuropsychological TestsSpeech TherapySemanticsAphasia, ConductionFrontotemporal DementiaLanguage DisordersMagnetic Resonance ImagingSpeech DisordersAphasia, WernickeBrainFrontotemporal Lobar DegenerationLanguageAcid Sensing Ion Channel BlockersTemporal LobePick Disease of the BrainLanguage TherapyDisease ProgressionNeuroimagingDementiaEcholaliaVerbal BehaviorDiffusion Tensor ImagingComprehensionFrontal LobeBrain MappingAlzheimer DiseaseRemission, SpontaneousCase-Control StudiesMental Status ScheduleImage Processing, Computer-AssistedFunctional LateralityNeurologic ExaminationCerebral CortexSeverity of Illness IndexAge of OnsetCognition DisordersGenetic VariationDisability EvaluationAniline CompoundsSpinal CordImage Interpretation, Computer-AssistedPositron-Emission TomographyDyslexia, AcquiredNerve Fibers, MyelinatedPhenotypeSpeech Production MeasurementLinguisticsNerve DegenerationStatistics, NonparametricStrokeNerve NetSupranuclear Palsy, ProgressiveRecurrenceNamesPsychomotor PerformanceTomography, X-Ray ComputedReproducibility of Results