In several diagnostic manuals of disabilities and disorders, High-Functioning Autism (HFA) is omitted and/or remains an unofficial diagnostic term. However, in 2007, the American Academy of Special Education Professionals has given it an official diagnostic code AU-4.00 in its Educator’s Diagnostic Manual of Disabilities and Disorders (EDM). This has rekindled research to re-look at HFA if it deserves to be given its own diagnostic code. Today, HFA refers to autistics who possess average/above-average intelligence and function in typical settings. This paper explores what ‘high-functioning’ is in the enigmatic condition of HFA.


Asperger Syndrome, High-Functioning Autism,


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  1. Allen, J. (2019, January 28). Understanding high-functioning autism/Asperger syndrome. Retrieved from: https://www.aspergers101.com/understanding-high-functioning-autism-asperger-syndrome/
  2. Amaral, D.G., Schumann, C.M., & Nordahl, C.W. (2008). Neuroanatomy of autism. Trends in Neurosciences, 31(3), 137-145. https://doi.org/10.1016/j.tins.2007.12.005
  3. American Psychiatric Association (APA) (1994). The diagnostic and statistical manual of mental disorders-4th edition (DSM-IV). Washington, DC: The Author.
  4. American Psychiatric Association (APA) (2000). The diagnostic and statistical manual of mental disorders-4th edition-text revision (DSM-IV-TR). Washington, DC: The Author.
  5. American Psychiatric Association (APA) (2013). The diagnostic and statistical manual of mental disorders-5th edition (DSM-5). Washington, DC: The Author.
  6. Baron-Cohen, S., Ashwin, E., Ashwin, C., Tavassoli, T., & Chakrabarti, B. (2009). Talent in autism: Hyper-systemizing, hyper-attention to detail and sensory hypersensitivity. Philosophical Transactions of the Royal Society B: Biological Sciences, 364(1522), 1377-1383. https://doi.org/10.1098/rstb.2008.0337
  7. Bonilha, L., Cendes, F., Rorden, C., Eckert, M., Dalgalarrondo, P., Li, L. M., & Steiner, C. E. (2008). Gray and white matter imbalance–Typical structural abnormality underlying classic autism? Brain and Development, 30(6), 396-401. https://doi.org/10.1016/j.braindev.2007.11.006
  8. Brun, C., Nicolson, R., Lepore, N., et al. (2009). Mapping brain abnormalities in boys with autism. Human Brain Mapping, 30(12), 3887-3900. https://doi.org/10.1002/hbm.20814
  9. Carpenter, L.A., Soorya, L., & Halpern, D. (2009). Asperger's syndrome and high-functioning autism. Pediatric Annals, 38(1), 30-5.
  10. Chia, K.H. (2008). Autistic savant: A need to re-define autism spectrum disorder. Singapore: Cobee Publishing House.
  11. Chia, K.H. (2012). Autism enigma: The need to include savant and crypto-savant in the current definition. Academic Research International, 2(2), 234-239.
  12. Chia, K.H., Lim, B.H., & Lee, B.M. (2017). Neuroimaging studies on the autistic brain: praxiologial implications for educational therapists. In A. Cost & E. Villalba (Eds.), Horizon in neuroscience research: Vol.32 (pp. 79-128). Hauppauge, NY: Nova Science Publishers.
  13. Chiang, H.M., Tsai, L.Y., Cheung, Y.K., Brown, A., & Li, H. (2014). A meta-analysis of differences in IQ profiles between individuals with Asperger’s disorder and high-functioning autism. Journal of Autism and Developmental Disorders, 44(7), 1577-1596. https://doi.org/10.1007/s10803-013-2025-2
  14. Daisley, A.D. (2018). Three tips to understand Aspergers & high-functioning autism in adults. Retrieved from: https://eduautism.com/aspergers-high-functioning-adults/.
  15. De Giambattista, C., Ventura, P., Trerotoli, P., Margari, M., Palumbi, R., & Margari, L. (2019). Subtyping the autism spectrum disorder: Comparison of children with high-functioning autism and Asperger syndrome. Journal of Autism and Developmental Disorders, 49, 138-150. https://doi.org/10.1007/s10803-018-3689-4
  16. Dunn, W. (1999). Sensory profile-caregiver questionnaire. San Antonio, TX: Psychological Corporation.
  17. Friedman, S.D., Shaw, D.W., Artru, A.A., Dawson, G., Petropoulos, H., & Dager, S.R. (2006). Gray and white matter brain chemistry in young children with autism. Archives of General Psychiatry, 63(7), 786-794.
  18. Ghaziuddin, M. (2008). Defining the behavioral phenotype of Asperger Syndrome. Journal of Autism and Developmental Disorders, 38, 138–142.
  19. Ghaziuddin, M., Tasi, L.Y. & Ghaziuddin, N. (1992) Brief report: A reappraisal of clumsiness as a diagnostic feature of Asperger syndrome. Journal of Autism and Developmental Disorders, 22, 651–656. https://doi.org/10.1007/BF01046333
  20. Gillberg, C. (1989). Early symptoms in autism. In C. Gillberg (ed.), Diagnosis and treatment of autism (pp. 23-32). Boston, MA: Springer.
  21. Gillberg, C. (1998). Asperger syndrome and high-functioning autism. The British Journal of Psychiatry, 172(3), 200-209. https://doi.org/10.1192/bjp.172.3.200
  22. Health Guide Info (2010, September 12). What are the characteristics of high-functioning autism? Retrieved from: https://www.healthguideinfo.com/causes-of-autism/p86696/#:~:text=Some%20common%20characteristics%20of%20high%20functioning%20autism%20include%3A,topics%20or%20categories%20of%20objects%20More%20items...%20.
  23. Macintosh, K.E., & Dissanayake, C. (2004). Annotation: The similarities and differences between autistic disorder and Asperger’s disorder: A review of the empirical evidence. Journal of Child Psychology and Psychiatry, 45(3), 421-434. https://doi.org/10.1111/j.1469-7610.2004.00234.x
  24. MaLaughlin-Cheng, E. (1998). Asperger syndrome and autism: A literature review and meta-analysis. Focus on Autism and Other Developmental Disabilities, 13, 234-245. https://doi.org/10.1177/108835769801300405
  25. Manjiviona, J., & Prior, M. (1995). Comparison of Asperger syndrome and high-functioning autistic children on a test of motor impairment. Journal of Autism and Developmental Disorders, 25(1), 23-39. https://doi.org/10.1007/BF02178165
  26. Ozonoff, S., Farham, J.M., et al (1994) Can standard measures identify subclinical markers of autism? Journal of Autism and Developmental Disorders, 23, 429–441.
  27. Ozonoff, S., Rogers, S.J., & Pennington, B.F. (1991). Asperger's Syndrome: Evidence of an Empirical Distinction from High‐Functioning Autism. Journal of Child Psychiatry and Psychology, 32(7), 1107-1122.
  28. Pierangelo, R., & Giuliani, G. (2007). EDM: The educator’s diagnostic manual of disabilities and disorders. San Francisco, CA: John Wiley and Sons.
  29. Planche, P., & Lemonnier, E. (2012). Research in autism spectrum disorders children with HFA and Asperger’s syndrome. Research in Autism Spectrum Disorders, 6, 939-948.
  30. Ramberg, C., Ehlers, S., Nydén, A., et al (1996) Language and pragmatic functions in school-age children on the autism spectrum. European Journal of Disorders of Communication, 31, 387–414.
  31. Rempel-Clower, N.L. (2007). Role of orbitofrontal cortex connections in emotions. Annals of New York Academy of Sciences, 1121, 72-86. https://doi.org/10.1196/annals.1401.026
  32. Sanders, J.L. (2009). Qualitative or quantitative differences between Asperger's disorder and autism? Historical considerations. Journal of Autism and Developmental Disorders, 39(11), 1560-1567. https://doi.org/10.1007/s10803-009-0798-0
  33. Schumann, C.M., Hamstra, J., Goodlin-Jones, B.L., et al. (2004). The amygdala is enlarged in children but not adolescents with autism: The hippocampus is enlarged at all ages. Journal of Neuroscience, 24(28), 6392-6401. https://doi.org/10.1523/JNEUROSCI.1297-04.2004
  34. Supekar, K., Uddin, L.Q., Khouzam, A., et al. (2013). Brain hyperconnectivity in children with autism and its links to social deficits. Cell Reports, 5(3), 738-747. https://doi.org/10.1016/j.celrep.2013.10.001
  35. Szatmari, P., Bartolucci, G., & Brenner, R. (1989). Asperger's syndrome and autism: comparisons on early history and outcome. Developmental Medicine and Child Neurology, 31, 709-720.
  36. Uddin, L.Q., Supekar, K., Lynch, C.J., Khouzam, A., et al. (2013). Salience network–based classification and prediction of symptom severity in children with autism. Journal of the American Medical Association-Psychiatry, 70(8), 869-879.
  37. WebMD (2018, November 12). What is high-functioning autism? Retrieved from: https://www.webmd.com/brain/autism/high-functioning-autism.
  38. World Health Organization (WHO) (2018). Manual of the international statistical classification of disease, injuries, and causes of death-11th edition (ICD-11). Geneva, Switzerland: The Author.
  39. Wright, J. (2013, May 21). Opinion: DSM-5 redefines autism. Spectrum News, 1-4.
  40. Xie, G.H. (2020). Cognitive maturity vs intellectual capacity. In Autism Training Program for the Christian Outreach to the Handicapped. Singapore: Steadfastness Consultancy.