Abbeduto L, Brady N, Kover ST. Language development and fragile X syndrome: profiles, syndrome-specificity, and within-syndrome differences. Ment Retard Dev Disabil Res Rev. 2007;13(1):36–46.

Article  PubMed  PubMed Central  Google Scholar 

Abbeduto L, McDuffie A, Thurman AJ. The fragile X syndrome–autism comorbidity: what do we really know? Front Genet. 2014;16(5):355.

Google Scholar 

Abbeduto L, Thurman AJ, McDuffie A, Klusek J, Feigles RT, Ted Brown W, Harvey DJ, Adayev T, LaFauci G, Dobkins C, Roberts JE. ASD comorbidity in fragile X syndrome: symptom profile and predictors of symptom severity in adolescent and young adult males. J Autism Dev Disord. 2019;15(49):960–77.

Article  Google Scholar 

Achenbach TM, Dumenci L, Rescorla LA. Ratings of relations between DSM-IV diagnostic categories and items of the CBCL/6-18, TRF, and YSR. Burlington: University of Vermont; 2001. p. 1–9.

Google Scholar 

American Psychiatric Association DS, American Psychiatric Association DS. Diagnostic and statistical manual of mental disorders: DSM-5. Washington, DC: American psychiatric association; 2013.

Bailey DB Jr, Raspa M, Bishop E, Olmsted M, Mallya UG, Berry-Kravis E. Medication utilization for targeted symptoms in children and adults with fragile X syndrome: US survey. J Dev Behav Pediatr. 2012;33(1):62–9.

Article  PubMed  Google Scholar 

Baribeau DA, Vigod S, Pullenayegum E, Kerns CM, Mirenda P, Smith IM, Vaillancourt T, Volden J, Waddell C, Zwaigenbaum L, Bennett T. Repetitive behavior severity as an early indicator of risk for elevated anxiety symptoms in autism spectrum disorder. J Am Acad Child Adolesc Psychiatry. 2020;59(7):890–9.

Article  PubMed  Google Scholar 

Belser RC, Sudhalter V. Arousal difficulties in males with fragile X syndrome: A preliminary report. Developmental Brain Dysfunction. 1995;8(4-6):270–9. https://psycnet.apa.org/record/1996-04102-007.

Bishop SL, Hus V, Duncan A, Huerta M, Gotham K, Pickles A, Kreiger A, Buja A, Lund S, Lord C. Subcategories of restricted and repetitive behaviors in children with autism spectrum disorders. J Autism Dev Disord. 2013;43:1287–97.

Article  PubMed  PubMed Central  Google Scholar 

Bishop SL, Richler J, Lord C. Association between restricted and repetitive behaviors and nonverbal IQ in children with autism spectrum disorders. Child Neuropsychol. 2006;12(4–5):247–67.

Article  PubMed  Google Scholar 

Blakeley-Smith A, Meyer AT, Boles RE, Reaven J. Group cognitive behavioural treatment for anxiety in autistic adolescents with intellectual disability: a pilot and feasibility study. J Appl Res Intellect Disabil. 2021;34(3):777–88.

Article  PubMed  Google Scholar 

Bodfish JW, Symons FJ, Parker DE, Lewis MH. Varieties of repetitive behavior in autism: comparisons to mental retardation. J Autism Dev Disord. 2000;30:237–43.

Article  PubMed  CAS  Google Scholar 

Carr EG. Positive behavior support for people with developmental disabilities: a research synthesis. Washington, DC: American Association on Mental Retardation; 1999.

Cohen IL, Vietze PM, Sudhalter V, Jenkins EC, Brown WT. Parent-child dyadic gaze patterns in fragile X males and in non-fragile X males with autistic disorder. J Child Psychol Psychiatry. 1989;30(6):845–56.

Article  PubMed  CAS  Google Scholar 

Cordeiro L, Ballinger E, Hagerman R, Hessl D. Clinical assessment of DSM-IV anxiety disorders in fragile X syndrome: prevalence and characterization. J Neurodev Disord. 2011;3(1):57–67.

Article  PubMed  Google Scholar 

Crawford H, Abbeduto L, Hall SS, Hardiman R, Hessl D, Roberts JE, Scerif G, Stanfield AC, Turk J, Oliver C. Fragile X syndrome: an overview of cause, characteristics, assessment and management. Paediatr Child Health. 2020a;30(11):400–3.

Article  Google Scholar 

Crawford H, Karakatsani E, Singla G, Oliver C. The persistence of self-injurious and aggressive behavior in males with fragile X syndrome over 8 years: a longitudinal study of prevalence and predictive risk markers. J Autism Dev Disord. 2019;15(49):2913–22.

Article  Google Scholar 

Crawford H, Moss J, Groves L, Dowlen R, Nelson L, Reid D, Oliver C. A behavioural assessment of social anxiety and social motivation in fragile X, Cornelia de Lange and Rubinstein-Taybi syndromes. J Autism Dev Disord. 2020b;50:127–44.

Article  PubMed  Google Scholar 

Crawford H, Moss J, Stinton C, Singla G, Oliver C. Overactivity, impulsivity and repetitive behaviour in males with fragile X syndrome: contrasting developmental trajectories in those with and without elevated autism symptoms. J Intellect Disabil Res. 2018;62(8):672–83.

Article  PubMed  CAS  Google Scholar 

Crawford H, Oliver C, Groves L, Bradley L, Smith K, Hogan A, Renshaw D, Waite J, Roberts J. Behavioural and physiological indicators of anxiety reflect shared and distinct profiles across individuals with neurogenetic syndromes. Psychiatry Res. 2023;30:115278.

Article  Google Scholar 

Crawford H, Waite J, Oliver C. Diverse profiles of anxiety related disorders in fragile X, Cornelia de Lange and Rubinstein-Taybi syndromes. J Autism Dev Disord. 2017;47:3728–40.

Article  PubMed  PubMed Central  Google Scholar 

Elliott CD. Differential Ability Scales—Second Edition (DAS-II). San Antonio: Harcourt Assessment; 2007.

Google Scholar 

Ezell J, Hogan A, Fairchild A, Hills K, Klusek J, Abbeduto L, Roberts J. Prevalence and predictors of anxiety disorders in adolescent and adult males with autism spectrum disorder and fragile X syndrome. J Autism Dev Disord. 2019;15(49):1131–41.

Article  Google Scholar 

Fielding-Gebhardt H, Brady N, Bredin-Oja SL, Warren SF. Transactional relationships between maternal requesting and responsivity, adolescent compliance, and task demands in fragile X syndrome. Res Dev Disabil. 2023;134:104417.

Fielding-Gebhardt H, Warren SF, Brady NC. Developmental trajectory of communication repair in children with fragile X syndrome. Autism Dev Lang Impair. 2020;5:2396941520909014.

Article  PubMed  PubMed Central  Google Scholar 

Friedman L, Sterling A, Barton-Hulsey A. Gaze avoidance and perseverative language in fragile X syndrome and autism spectrum disorder: brief report. Dev Neurorehabil. 2018;21(2):137–40.

Article  PubMed  PubMed Central  Google Scholar 

Friedman L, Lorang E, Hilvert E, Sterling A. “Are we done yet?” Question-asking in boys with fragile X syndrome and idiopathic autism spectrum disorder. J Speech Lang Hear Res. 2020;63(6):1822-34.

Goodwin MS, Haghighi M, Tang Q, Akcakaya M, Erdogmus D, Intille S. Moving towards a real-time system for automatically recognizing stereotypical motor movements in individuals on the autism spectrum using wireless accelerometry. In: Proceedings of the 2014 ACM international joint conference on pervasive and ubiquitous computing 2014. p. 861–872.

Guertin EL, Vause T, Thomson KM, Frijters JC, Feldman MA. Obsessive–compulsive behaviors in autism spectrum disorder: behavior analytic conceptual frameworks. Behav Anal. 2022;22(1):81.

Google Scholar 

Hagerman R, Lauterborn J, Au J, Berry-Kravis E. Fragile X syndrome and targeted treatment trials. Modeling fragile X syndrome. Results Probl Cell Differ. 2012;54:297–335.

Article  PubMed  PubMed Central  CAS  Google Scholar 

Hagerman RJ, Hagerman PJ, editors. Fragile X syndrome: Diagnosis, treatment, and research. US: Taylor & Francis; 2002.

Hall SS, Lightbody AA, Hirt M, Rezvani A, Reiss AL. Autism in fragile X syndrome: a category mistake? J Am Acad Child Adolesc Psychiatry. 2010;49(9):921–33.

Article  PubMed  PubMed Central  Google Scholar 

Hall SS, Lightbody AA, Reiss AL. Compulsive, self-injurious, and autistic behavior in children and adolescents with fragile X syndrome. Am J Ment Retard. 2008;113(1):44–53.

Article  PubMed  Google Scholar 

Hall SS, Monlux KD, Rodriguez AB, Jo B, Pollard JS. Telehealth-enabled behavioral treatment for problem behaviors in boys with fragile X syndrome: a randomized controlled trial. J Neurodev Disord. 2020;12:1–5.

Article  Google Scholar 

Harrop C, Dallman AR, Lecavalier L, Bodfish JW, Boyd BA. Behavioral inflexibility across two neurogenetic conditions: down syndrome and fragile x syndrome. Am J Intellect Dev Disabil. 2021;126(5):409–20.

Article  PubMed  Google Scholar 

Hessl D, Tassone F, Cordeiro L, Koldewyn K, McCormick C, Green C, Wegelin J, Yuhas J, Hagerman RJ. Brief report: aggression and stereotypic behavior in males with fragile X syndrome—Moderating secondary genes in a “single gene” disorder. J Autism Dev Disord. 2008;38:184–9.

Article  PubMed  Google Scholar 

Hogan A, Hunt E, Smith K, Black C, Bangert K, Klusek J, Roberts J. Trajectories of heart activity across infancy to early childhood differentially predict autism and anxiety symptoms in fragile X syndrome. Front Psych. 2021;6(12):727559.

Article  Google Scholar 

Hunter J, Rivero-Arias O, Angelov A, Kim E, Fotheringham I, Leal J. Epidemiology of fragile X syndrome: a systematic review and meta-analysis. Am J Med Genet A. 2014;164(7):1648–58.

Article  Google Scholar 

Ingram K, Lewis-Palmer T, Sugai G. Function-based intervention planning: comparing the effectiveness of FBA function-based and non—function-based intervention plans. J Posit Behav Interv. 2005;7(4):224–36.

Article  Google Scholar 

Joosten AV, Bundy AC, Einfeld SL. Intrinsic and extrinsic motivation for stereotypic and repetitive behavior. J Autism Dev Disord. 2009;39:521–31.

Article  PubMed  Google Scholar 

Kästel IS, Vllasaliu L, Wellnitz S, Cholemkery H, Freitag CM, Bast N. Repetitive behavior in children and adolescents: Psychometric properties of the German version of the repetitive behavior scale-revised. J Autism Dev Disord. 2021;51:1224–37.

Kerns CM, Winder-Patel B, Iosif AM, Nordahl CW, Heath B, Solomon M, Amaral DG. Clinically significant anxiety in children with autism spectrum disorder and varied intellectual functioning. J Clin Child Adolesc Psychol. 2021;50(6):780–95.

Article  PubMed