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Comparing Tangible Symbols, Picture Exchange, and a Direct Selection Response for Enabling Two Boys with Developmental Disabilities to Access Preferred Stimuli

Picture ExchangeDevelopmental DisabilityCognitive ScienceSocial SkillsExceptional ChildCognitive DevelopmentEducationSpecial EducationSocial SciencesDirect Selection ResponseDevelopmental DisorderDevelopmental DisabilitiesTangible SymbolsSymbol UsePsychologySpecific Learning DisorderChild Development