Human Teeth and Brain Size Not Linked in Evolution Says New Study
This research challenges the classically accepted view that reduction of tooth size in hominins is linked with having a larger brain. The reasoning is that larger brains allowed hominins to start making stone tools and that the use of these tools reduced the need to have such large chewing teeth. But recent studies by other authors found that hominins had larger brains before chewing teeth became smaller, and they made and used stone tools when brains were still quite small, which challenges this relationship.
This is a 3-D reconstruction of a modern human cranium showing the teeth and endocranial cast.
Credit: George Washington University
“The findings of the study indicate that simple causal relationships between the evolution of brain size, tool use and tooth size are unlikely to hold true when considering the complex scenarios of hominin evolution and the extended time periods during which evolutionary change has occurred,” said Aida Gómez-Robles, lead author of the paper and a postdoctoral scientist at GW’s CASHP.
To conduct the research, Dr. Gómez-Robles and her colleagues analyzed eight different hominin species. The researchers identified fast-evolving species by comparing differences between groups with those obtained when simulating evolution at a constant rate across all lineages, and they found clear differences between tooth evolution and brain evolution. If the classical view proposing co-evolution between brains and teeth is correct, they expected to see a close correspondence between species evolving at a fast rate for both traits. The differences they observed indicate that diverse and unrelated factors influenced the evolution of teeth and brains.
“Once something becomes conventional wisdom, in no time at all it becomes dogma,” said Bernard Wood, university professor of human origins at GW and a co-author of the paper. “The co-evolution of brains and teeth was on a fast-track to dogma status, but we caught it in the nick of time.”
The research published Jan. 2 in the Proceedings of the National Academy of Sciences.
Emily Grebenstein
Source: http://www.ineffableisland.com/2017/01/human-teeth-and-brain-size-not-linked.html
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No evolution, only the most ignorant godless people believe that crap.
That is until you get infections or Cancer, where you suddenly find out at the level of cells which rapidly divide mutate and share genomes evolution exists.
Here’s a mystery for you. You could probably cite Handel’s messiah for it. How many cell divisions to get a “human”?
No thanks, I don’t buy your shit.