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'''Autism''' is a disorder of [[brain|neural]] development that is characterized by impaired social interaction and [[communication]], and by restricted and repetitive [[behavior]]. These signs all begin before a child is three years old.[1] Autism involves many parts of the [[brain]]; how this occurs is not well understood.[2] The two other autism [[spectrum]] disorders (ASD) are [[Asperger syndrome]], which lacks delays in [[cognitive]] development and [[language]], and PDD-NOS, diagnosed when full criteria for the other two disorders are not met.[3]

'''Autism''' is a disorder of [[brain|neural]] development that is characterized by impaired social interaction and [[communication]], and by restricted and repetitive [[behavior]]. These signs all begin before a child is three years old.[1] Autism involves many parts of the [[brain]]; how this occurs is not well understood.[2] The two other autism [[spectrum]] disorders (ASD) are [[Asperger syndrome]], which lacks delays in [[cognitive]] development and [[language]], and PDD-NOS, diagnosed when full criteria for the other two disorders are not met.[3]

<center>For lessons on the [[topic]] of '''''Autism''''', follow [http://nordan.daynal.org/wiki/index.php?title=Category:Autism this link].</center>

<center>For lessons on the [[topic]] of '''''Autism''''', follow [https://nordan.daynal.org/wiki/index.php?title=Category:Autism this link].</center>

Autism has a strong [[DNA|genetic]] basis, although the genetics of autism are [[complex]] and it is unclear whether ASD is explained more by rare mutations, or by rare combinations of common genetic variants.[4] In rare cases, autism is strongly associated with agents that cause birth defects.[5] Controversies surround other proposed [[environmen]]tal causes, such as heavy metals, pesticides or childhood vaccines;[6] the vaccine hypotheses are [[biologically]] implausible and lack convincing [[scientific]] [[evidence]].[7] The prevalence of autism is about 1–2 per 1,000 people; the prevalence of ASD is about 6 per 1,000, with about four times as many [[male]]s as [[female]]s. The number of people known to have autism has increased dramatically since the 1980s, partly due to changes in diagnostic [[practice]]; the question of whether actual prevalence has increased is unresolved.[8]

Autism has a strong [[DNA|genetic]] basis, although the genetics of autism are [[complex]] and it is unclear whether ASD is explained more by rare mutations, or by rare combinations of common genetic variants.[4] In rare cases, autism is strongly associated with agents that cause birth defects.[5] Controversies surround other proposed [[environmen]]tal causes, such as heavy metals, pesticides or childhood vaccines;[6] the vaccine hypotheses are [[biologically]] implausible and lack convincing [[scientific]] [[evidence]].[7] The prevalence of autism is about 1–2 per 1,000 people; the prevalence of ASD is about 6 per 1,000, with about four times as many [[male]]s as [[female]]s. The number of people known to have autism has increased dramatically since the 1980s, partly due to changes in diagnostic [[practice]]; the question of whether actual prevalence has increased is unresolved.[8]