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Most parents report that the onset of autism features appear within the first or second year of life. [11] [12] This course of development is fairly gradual, in that parents typically report concerns in development over the first two years of life and diagnosis can be made around 3–4 years of age. [9]
Autism spectrum disorder [a] (ASD), or simply autism, is a neurodevelopmental disorder "characterized by persistent deficits in social communication and social interaction across multiple contexts" and "restricted, repetitive patterns of behavior, interests, or activities". [11] Sensory abnormalities are also included in the diagnostic manuals ...
Autism spectrum disorder is a disorder of the many parts of the brain. Structural changes are observed in the cortex, which controls higher functions, sensation, muscle movements, and memory. Structural defects are seen in the cerebellum too, which affect the motor and communication skills. [ 14 ]
The Autism Treatment Evaluation Scale (ATEC) is a 77-item diagnostic assessment tool that was developed by Bernard Rimland and Stephen Edelson at the Autism Research Institute. The ATEC was originally designed to evaluate the effectiveness of autism treatments, but it may also be beneficial as a screening tool for children.
The paternal age effect is the statistical relationship between the father's age at conception and biological effects on the child. [1] Such effects can relate to birthweight, congenital disorders, life expectancy, and psychological outcomes. [2]
Research-determined cut-offs identify the potential diagnosis of autism spectrum disorder, allowing a standardized assessment of autistic symptoms. The Autism Diagnostic Interview-Revised (ADI-R), a companion instrument, is a structured interview conducted with the parents of the referred individual to cover the subject's full developmental ...
Which autism spectrum diagnoses can be made and which criteria are used depends on the local healthcare system's regulations. According to the DSM-5-TR (2022), in order to receive a diagnosis of autism spectrum disorder, one must present with "persistent deficits in social communication and social interaction" and "restricted, repetitive ...
Disorders formerly considered distinct, but now diagnosed as autism spectrum disorder, include: Asperger syndrome – a previously diagnosed form of autism often applied to people with a higher IQ who can have a less difficult time communicating with others and understanding concepts or phrases than other individuals with more severe autism. As ...