Brain expansion (Evolution)

by David Turell @, Sunday, August 02, 2020, 21:02 (58 days ago) @ dhw

DAVID: Note this article shows in tool making in a lesser brain by H. habilis:
https://science.sciencemag.org/content/369/6503/520.4?utm_campaign=ec_sci_2020-07-30&am...

QUOTE: A very rare type of tool made from a hippopotamus bone has been discovered at the Konso Formation in southern Ethiopia. This artifact represents a technological breakthrough achieved 1.75 million years ago.BB […] (David’s bold)

dhw: The article goes on to explain all the features that were original, and attributes the tool to homo erectus, not habilis.

Sorry for the error. Where was m y mind? Yes erectus, in the age described.


DAVID: The Moroccan tools were not that advanced in comparison. Itty-bitty advances until very recently. The tools did not drive expansion. […]

dhw: Then maybe it was these tools that required the expansion of the erectus brain. But I don’t know why you are fixated on tools. We took the spear as a concrete example of the process, but NOBODY KNOWS what caused expansion. My theory is not based on tools but on the fact that the modern brain responds to new requirements by complexifying or, on a small scale, expanding, and I see no reason why the same process should not have taken place in earlier brains, but with major expansions. You have not yet provided any reason why it shouldn’t.

Yes I have. I think God expanded brains and that explains the progression of better artifacts with each new-size brain.


DAVID: You are not my dualist, as my dualism is so different, as you well know.

dhw: You have often said that the brain causes thought, but when challenged you have claimed that I have misunderstood your shorthand. Do you now disagree that the dualist's brain DOES NOT CAUSE thoughts but complexifies/expands in RESPONSE to the thoughts of the dualist's soul? Please answer without equivocation.

As usual, as you well know my theory, the soul must use the existing brain complexity to develop the allowed degree of thought complexity.


DAVID: 'Stasis', as we use the term, occurs after enlargement, not before…

dhw: Stasis occurs before and after enlargement! Here is my sequence: 1) new requirement, 2) brain enlarges through meeting new requirement; 3) followed by stasis = no new ideas, no expansion. 4) Stasis ends with new ideas and new expansion. When I say “long periods of stasis between earlier expansions”, the stasis comes after the original enlargement and before the next one! Sapiens' stasis came between initial expansion and sudden burst of new ideas, resulting in enhanced complexification.

Sapiens history of stasis does not fit your definition of stasis. Moroccans did not show new artifacts in the discovery of sapiens fossils.


DAVID....and complexification is after enlargement and then the brain reorganizes to fit the soul's uses.

dhw: Complexification, as we have agreed, would have preceded all enlargements and followed all enlargements. In sapiens, however, major enlargement ceased and complexification took over. If by “reorganizes” you mean the brain complexifies as it implements the thoughts of the dualist’s soul, we are in agreement.

No, I mean our brain was over-enlarged and then shrunk as reorganized to fit our uses. Whether habilis or erectus complexified is likely, but not proven because of what fossils give us to know.


DAVID: Habilis brain was used quite actively, as was the erectus larger brain, and then sapiens appeared, with not much different in lifestyle until 70,000 years ago. So 'big' ideas driving expansion has no sense of proof in the facts we have. Our enormous ideas caused shrinkage from complexification.

dhw: What is a “sense of proof”? NOBODY KNOWS WHAT CAUSED EXPANSION, and the sapiens stasis does not provide any “sense of proof” that your God did an overnight dabble on a group of Moroccans. But yes, our enormous ideas caused shrinkage from complexification, thus proving that the implementation of ideas changes the brain.

All we can know is a bigger brain can shrink under usage. I'll stick with God running evolution as e know it.


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