The purpose of this Systematic Literature Review and Meta-analysis ((SLR & Meta-analysis) was to examine the differences between Asperger syndrome (AS) individuals and typically developing and achieving individuals (TD) regarding language competence and how are these differences related to AS individuals' age and the significance such differences add to our knowledge of understanding their language performance as issues that are still underdiagnosed and ill-treated entities.The study followed SLR & Meta-analysis protocol and was armed with data of 456 AS subjects and controls (231 and 225, respectively) abstracted from 14 studies that have been collected from different electronic bibliographic databases including web of science, Scopus, EMBASE, Cochrane library, PubMed, PsycInfo and google scholar along with unpublished literature. Outlined results show deterioration in language competence of AS subjects in comparison to TD controls. Such deterioration impairs conversational implicature more than it does to conventional maxims of AS individuals' pragmatic language and has no relationship with their age. Results also show that difference in intelligence feature of the mental reality in the language competence becomes smaller with increasing age, and that difference in representational content feature becomes larger. These findings help experts in the field not only predict pragmatic language impairments in AS individuals but also enable AS individuals themselves to decode and/or interpret speech inputs; therefore, perceive the world around them and interact with its community members.Outcomes should be considered to lay out a path for further exploration of genetics, etiology, and response to treatment of all these premises that is currently unsearched in AS individuals.
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