The ancient roots of ASD: Neanderthalensis interbreeding?

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Lukecash12
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21 Jun 2015, 9:14 pm

http://rdos.net/eng/

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General findings

Aspie Quiz have researched many probable Neanderthal traits.

As can be seen, the Hn factor becomes almost two millions years old and the g factor becomes 37,000 years old, which is the time of the hybridization. The most likely interpretation is that Hn factor is Eurasian diversity, Hs factor is the evolution of modern humans, and g factor is the introduction of Euroasian diversity through interbreeding with Neanderthals 30,000 - 50,000 years ago. In Aspie Quiz, Hn factor is used to calculate the Aspie-score, Hs factor is used to calculate neurotypical score, and g factor is positively correlated with Aspie ability group and negatively correlated with Aspie disability group. It therefore is likely that g factor is related to g-factor in intelligence tests.


A series of compelling genetic studies and it's correlation with our own Aspie quiz scores. If you hadn't noticed while taking the quiz, there are numerous questions in there that aren't standard criteria for diagnosis but specifically relative to H. Neanderthalensis behavior; there is a 1-4% presence of Neanderthalensis genes in the general population after all. This is especially intriguing when you take into account that there is the occurrence of ASD amongst people of African ancestry is 1/6 that of occurrence amongst people of Indo-European ancestry.

There are also some exciting comparisons between ASD behavior and symptoms, and adaptations to a cold climate.

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According to a research study, body lice evolved 70,000 years ago. 92 Woven cloth seems to date back at least 27,000 years in Europe. 93 This seems to indicate that clothes and artificial warming is a recent happening in our species. There is no compelling evidence for artificial warming with fires or tailormade clothes in Neanderthals. Therefore, Neanderthals most likely had fur. Without fur they would not be able to survive in Finland in between ice-ages, nor in Europe during the ice-ages. There is a genetic difference called congenital hypertrichosis, which essentially is fur in modern humans. 94 The reports of this "disorder" seems to indicate an origin from guanchos from the canary-islands. It's interesting that this hair is unpigmented. People with congenital hypertrichosis also show long, prominent back of the nose and a round nose tip and lag in the development of the first and second dentition. It's common with more body-hair in Europeans, and especially in people with autism. 95 Peeling skin flakes from self or others is also common in autistics. 96This seems to be a grooming behavior commonly seen in other primates which indicates an evolutionary past with a fur-coat.


Utterly fascinating.


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kamiyu910
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21 Jun 2015, 10:08 pm

That is fascinating. I've been wanting to get a DNA test done to see what percentage of what I am, but I certainly wouldn't be surprised if there's any neanderthal DNA since I have mostly Northern European ancestors. On my dad's side, we're all quite in love with the cold and don't do well in the heat (if it gets over 80F, it's too much for me, lol)


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iliketrees
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22 Jun 2015, 1:23 am

Wow, never knew there was Neanderthal genetics in the population today. Maybe this could be one of the causes of autism. More research needs to be done to see if there is differences. Would be very interesting.



cberg
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22 Jun 2015, 1:32 am

Indeed, Neanderthalensis phenotype dominance seems like quite a likely story, especially considering the prevalence of HFA in Scandinavia & northern Europe in general. I'm 50% Norsk myself! I'll have more time to read into this in the morning, I hope this thread lives long & prospers.


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izzeme
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22 Jun 2015, 2:27 am

I already knew of this hypothesis, and there seems to be some validity to it; it offers reasonable explanations for many traits (physical, mental and behavioural) seen in the autistic population.



BirdInFlight
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22 Jun 2015, 3:25 am

I relate to the "peeking skin flakes" behavior in that final sentence; I'm a skin picker.



Lukecash12
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25 Jun 2015, 1:33 am

BirdInFlight wrote:
I relate to the "peeking skin flakes" behavior in that final sentence; I'm a skin picker.


Yes, I've noticed this and a number of other behaviors that aren't considered symptomatic of ASD in myself, that fit well with this description. Some behaviors ascribed to H. Neanderthalensis are very speculative and don't pretend not to be, yet others are actually pretty logical, and consistent with our understanding of anthropology today concerning pre-agrarian cultures and the behavior of animals that are similar to hominids.


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Marky9
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25 Jun 2015, 7:51 am

Just last night I saw a documentary about the higher-than-expected prevalence of Neanderthal DNA among non-African populations. Going forward, it will be interesting to watch how understandings of this and its implications unfold.



naturalplastic
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25 Jun 2015, 3:30 pm

The "Neanderthal Hypothesis" of autistic origins has been around for a few years. And it comes up here on WP now and again.

Am an interested skeptic of the theory. Has some logic to it. Neanderthals differed from anatomical moderns in being less into "networking" -they seemed to have had fewer social/business ties and alliances. Lived in smaller groups, and didnt access resources from as far away via trade and reciprocity the way that anatomical moderns did in the stone age (or like hunter gathers do today). Hense the notion that their behavior was more "autistic", and that surviving Neanderthal genes in the population might recombine today to cause the autism in children born today. Maybe. Maybe not.

I was a skin picker when I was around 8, and I am barrel chested (like modern monkeys, and like extinct hominids like the Neanderthals). I will say that much.



The_Walrus
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25 Jun 2015, 5:45 pm

Lukecash12 wrote:
This is especially intriguing when you take into account that there is the occurrence of ASD amongst people of African ancestry is 1/6 that of occurrence amongst people of Indo-European ancestry.

It can be difficult to separate that from the different social factors surrounding race.

There aren't many countries with both healthcare that is accessible to all and a significant black population, and even then, there may be other factors which stop black people being diagnosed.



kamiyu910
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25 Jun 2015, 7:47 pm

There was another post a while back that also discussed this: Interbreeding Between Humans, Neanderthals, Denisovans...

They have some good articles, in which they talked about the other groups, like the Denisovans and an unknown non-human strain of DNA found in Asia. One site is a website for a group who does outreach to the autistic kids in Africa.

Cyberdad wrote:
http://autismcommunityofafrica.org/About_us.html
The Autism Community of Africa(ACA) was founded in 2007 by Mrs. Brigitte M. Kobenan, the mother of a child with Autism. As she shared her experience with friends and families in the United States and in Africa, she realized that she was not alone. Many families had at least one child with Autism. However among some African families, parents felt ashamed or afraid to disclose their child's condition for fear of being judged or rejected.
In Africa, the lack of awareness and resources prevent most children with Autism to have the necessary tools and treatment to monitor and/or improve their condition. Thus many times, they become a burden for families and communities.


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Ettina
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25 Jun 2015, 7:59 pm

This theory has so much wrong with it.

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This is especially intriguing when you take into account that there is the occurrence of ASD amongst people of African ancestry is 1/6 that of occurrence amongst people of Indo-European ancestry.


I have never seen good evidence for this claim. Since many studies suggest non-White autistics are underdiagnosed, I think it's premature to claim that autism is truly less prevalent in non-Whites.

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There is no compelling evidence for artificial warming with fires or tailormade clothes in Neanderthals. Therefore, Neanderthals most likely had fur. Without fur they would not be able to survive in Finland in between ice-ages, nor in Europe during the ice-ages.


Neanderthals did not have fur. Our ancestors lost their fur as homo erectus if not earlier, long before Neanderthals diverged from homo sapiens. In addition, Neanderthals did have clothing, but not as complex in design as homo sapiens clothing.

Also, there's evidence for autism in other species, such as chimpanzees and mice, so I'm pretty sure autism in humans pre-dates the Neanderthal/homo sapiens split.

So, while it's a nice fantasy, it doesn't fit the facts.



iliketrees
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26 Jun 2015, 12:51 am

Ettina wrote:
Also, there's evidence for autism in other species, such as chimpanzees and mice

Correct me if wrong, but wasn't that after experiments about the condition of the womb of mothers who had given birth to autistic children? I can't remember what it was but they injected something into mother chimpanzees and when they gave birth the baby displayed "autistic-like" behaviour. Believe they did something similar with the mice too.