Autistic DisorderEcholaliaManual CommunicationImitative BehaviorGeneralization (Psychology)Education, SpecialReinforcement, VerbalBehavior TherapyLanguage TherapyGeneralization, StimulusSelf StimulationTransfer (Psychology)Education of Intellectually DisabledToken EconomyPlay and PlaythingsLanguage Development DisordersSpeech TherapySign LanguageVerbal BehaviorDiscrimination LearningCommunication Methods, TotalStereotyped BehaviorReinforcement (Psychology)Social BehaviorChild WelfareTeachingReinforcement ScheduleDisabled ChildrenChild BehaviorPeer GroupInterpersonal RelationsCase-Control StudiesChild Health ServicesChild RearingVisual PerceptionChild, InstitutionalizedChild Behavior DisordersChild PsychologyAutoantibodiesChild of Impaired ParentsDental Care for ChildrenChild, OrphanedParentsChild Nutrition DisordersChild LanguageChild Nutritional Physiological PhenomenaChild MortalityMothersAge FactorsParent-Child RelationsPrevalenceCross-Sectional StudiesRisk FactorsQuestionnairesChild CustodyProspective StudiesChild Development Disorders, PervasiveFollow-Up StudiesRetrospective StudiesInfant, NewbornPediatricsBody HeightAsthmaSchoolsSocioeconomic FactorsUnited StatesLongitudinal StudiesChild, AbandonedMother-Child RelationsTreatment OutcomeHospitals, PediatricGrowth DisordersChild Nutrition SciencesPregnancyTime FactorsIntelligence