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Someone I know said that he has a friend who's son was mildly autistic until the age of 7, at which point he had a "huge regression" and now he is "much more autistic." He claims that over 1/3 of autistic kids have "large regressions" later in childhood (like at 7 or older).
Is this true? I mean, I have known plenty of kids who have had temporary regressions, but he is saying the kid regressed and didn't regain anything back. Honestly, have I been living under a rock?
An older study showed that when untreated, about 1/3 of autistic kids had a decline in tested IQ scores (of about 20 points or so) but it's unclear if that was regression or stagnation. Since IQ scores are a combination of age and abilities (100/age*mental age), failure to advance as quickly as expected will cause IQ scores to decline, even if the kid has actually
gained ability.
True regression is extremely rare in autistic kids past the age of 3. When it does happen, it's usually in adolescence, because a small subset of autistic kids have onset of seizures and/or motor problems in adolescence. Some medical syndromes that cause autistic traits can be associated with childhood regression, such as tuberous sclerosis (which causes tumor-like growth in the brain). These are present in only a very small proportion of autistic kids.