Abstract
Author(s): Soada Mihandoust, Somayeh Omidi, Sanaz Shahonvand and Fazlollah Shahraki*Autism Spectrum Disorder (ASD) is a dysfunction of the nervous system resulting in significant impairment in social interactions, communication skills, behaviours, and interests. This study aims to assess the correlation between Intelligence Quotient (IQ) and ASD. All papers connected to the topic were reviewed for this purpose throughout 1995 and 2021 by systematically searching internationally available databases such as Web of Science, Science Direct, Scopus, PubMed, and Google Scholar. Finally, 20 relevant studies were selected to extract the results and to interpret the results. The study results showed that 50%-70% of people with ASD have an intellectual disability, and a level of IQ of less than 70 with impaired daily functioning is another feature of this type of patient. Moreover, according to the results of some studies, in ASD patients, Performance IQ (PIQ) is often more than Verbal IQ (VIQ). Based on the results, it can be concluded that ASD disease impairs the level of intelligence of patients, which in the most severe case leads to mental disability. However, due to the limited studies on the level of intelligence of children with ASD, further studies are needed.