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CDD is a rare condition, with only 1.7 cases per 100,000. [13] [14] [15]A child affected with childhood disintegrative disorder shows normal development. Up until this point, the child has developed normally in the areas of language skills, social skills, comprehension skills, and has maintained those skills for about two years.
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]
Theories about the cause of self-injurious behavior in children with developmental delay, including autistic children, include: [89] Frequency or continuation of self-injurious behavior can be influenced by environmental factors (e.g., reward in return for halting self-injurious behavior). This theory does not apply to younger children with autism.
Autistic meltdown describes an intense, often uncontrollable response to an overwhelming situation experienced by some autistic individuals.. Angry outbursts in autistic people have been referred to as meltdowns that manifest as an intense reaction, [1] but such outbursts are different to true meltdowns, which always take some time to recover from. [2]
A 2003 review of epidemiological studies of children found autism rates ranging from 0.03 to 4.84 per 1,000, with the ratio of autism to Asperger syndrome ranging from 1.5:1 to 16:1; [142] combining the geometric mean ratio of 5:1 with a conservative prevalence estimate for autism of 1.3 per 1,000 suggests indirectly that the prevalence of AS ...
ABA focuses on teaching adaptive behaviors like social skills, play skills, or communication skills [69] [70] and diminishing problematic behaviors like eloping or self-injury [71] by creating a specialized plan that uses behavioral therapy techniques such as positive or negative reinforcement to encourage or discourage certain behaviors over-time.
The amygdala, cerebellum, and many other brain regions have been implicated in autism. [15]Unlike some brain disorders which have clear molecular hallmarks that can be observed in every affected individual, such as Alzheimer's disease or Parkinson's disease, autism does not have a unifying mechanism at the molecular, cellular, or systems level.
A high-functioning group (around 25 percent) whose symptoms more or less overlap with that of what was Asperger syndrome, while also not meeting the then current criteria for autism spectrum disorder, but who completely differ from those with Asperger syndrome in terms of having a lag in language development and/or mild cognitive impairment ...