Mystery population that mixed with early homosapiens contributed to brain functions in modern Humans

[Aurelian]

This is study is about 2 A and B populations that split 1.5 millions years ago, then 300k years ago, way before homosapiens intermix with the neanderthals (45k-60k ago), A and B rejoined again (around 300k ago). This B group, according to the study, contributed to 20% of modern humans genome, and enriched cognitive abilities in modern humans.

We provide evidence of general selection against introgressed material from the minor (B) lineage, while also seeing enrichment of introgression specifically in a set of categories associated with neuronal development and processing.

A structured coalescent model reveals deep ancestral structure shared by all modern humans - Nature Genetics

The cobraa model extends the pairwise sequentially Markovian coalescent to identify structured population history by examination of the model transition matrix. Applied to human polymorphism data, cobraa identifies an ancient admixture event ancestral to all modern humans.

www.nature.com

 

[Aurelian]

A video explaining it clearly

 

[Espaa_]

quick question im so sorry but arent the majority of us muslims here if you are then i would like to remind you this hominin stuff is used for race science and that we all come from adam as and hawa.

Just confirming. If you arent muslim pls disregard this and sorry for assuming

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[balanbalis]

quick question im so sorry but arent the majority of us muslims here if you are then i would like to remind you this hominin stuff is used for race science and that we all come from adam as and hawa.

Just confirming. If you arent muslim pls disregard this and sorry for assuming

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[The alchemist]

As a guy who has been reading about these sorts of studies through the years and thankfully gaining some intuition for these ambitious attempts, I can tell that these are heavy in computation and model framing, which are highly tentative.

To me, this seems to be skewed by the selection history of human genomic diversity rather than a function of admixture structure coalescence cycle.

I think in the near future we will find that these models are signal hazardous that reflect complex biological dimensional variety within one broad integrity parameter, inferred falsely in a disproportionate temporal significance and ancestry multi-step directionally (as in this case).
We simply have non-matching genetics and not all of it is from foreign admixture. Some of it is human internal diversity that simply patterns up in distinct ways.

The methodology used is hypothetically based to fix patterns interpreted in various ways. These models are assumption-heavy.

Another thing to note as well, this hypothetical population B might exist to give A structure because of the model problems as an internal feature of complex ancestry rather than compartmentalized. After all, both populations supposedly diverged 1.5 million years ago.
What these guys are really tapping into is how non-linear multi directional biological patterns can be. Which is probably groundbreaking for future understanding of human biology if they can scientifically define it in the correct study rigor. It is multi-system-based, and probably should not be described as two separate ancestry associations.

There are more rules to the systems not accounted for. Those hidden rules are what throw the models off that set pre-set conditions and fits the data through it.