"Researchers say this is consistent with structural MRI findings of enlarged brain size and an overabundance of neurons in ASD, due to the fact that the synapses of neurons have not been sufficiently "pruned" as the brain develops. Too many functioning synapses inhibit cognition while requiring extra blood flow."
Correlate that with,
"A search of Harvard-affiliated hospital records failed to find many patients over the age of 55 who had been diagnosed with both Alzheimer’s and any type of autism."
https://www.sciencenews.org/article/aut ... %E2%80%99s
and you just might have an indication as to why at least some people on the spectrum seem to have reduced severity of some of their AS/ASD symptoms as they age, and why they seem to lose less cognitive abilities compared to controls as they age.
See also: http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3324697/
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