Brain expansion (Evolution)

by David Turell , Thursday, August 06, 2020, 19:43 (1355 days ago) @ dhw

dhw: It means that the brain gets bigger through the process of implementation.

Which didn't exist with the Moroccans' fossils

DAVID: Which bigger brained fossil should be accompanied by new advanced artifact. The Moroccan sapiens were not but we see stasis. . And later: Your underlying theory requires a new artifact to appear with the new larger brained fossil.

This is getting silly. I keep repeating that NOBODY KNOWS what caused any of the expansions, and that we used artefacts as a concrete illustration of the process. In the bold above, e.g. means "for example". It does not mean every expansion was caused by the invention of a new artefact! What we see in Moroccan sapiens is the larger brain. We don’t know what caused the larger brain. That is why we have theories. Presumably yours is that one night God stepped in and dabbled with their brains, skulls and pelvises. Any evidence?

I'll stick with God, and with no evidence you are now avoiding the need for artifacts and offering meaningless verbiage..

Xxxx

On the subject of reading:
QUOTE: "To account for the development of this skill, some scientists have hypothesized that parts of the brain that originally evolved for other purposes have been "recycled" for reading. As one example, they suggest that a part of the visual system that is specialized to perform object recognition has been repurposed […](David’s bold)

DAVID: This finding is a logical extension of what we have learned about our big and formally oversized brain. We have been given a brain that has the ability to repurpose or recycle an area with underlying abilities […]

dhw: For once, we agree. This hypothesis illustrates the point that a new requirement leads to brain change. I don’t think even you would propose that your God altered the visual system BEFORE people thought of reading and writing. (The relevant sections of the illiterate women’s brains complexified when they learned to read, and not before). However, since the system did not lose its original function, I’d say it complexified (perhaps even expanded), not that it was repurposed or recycled. […] But what we do know, and what is supported by the above hypothesis, is that the brain changes as it responds to new requirements and not in anticipation of them. I can only repeat that I see no reason why anyone should assume that the same process was not responsible for complexifications and expansions before and including that of sapiens.

DAVID: No matter what you propose about brain enlargement, all we know is our big brain was present long before it was used in any new way.

dhw: Yes, the non-use is what we call stasis. And I wonder why you think your God expanded the brain when he did, if he knew that we weren’t going to use it for 270,000 years. I have pointed out that after each expansion (cause unknown, but maybe new inventions, new requirements caused by changed conditions) there has also been a period of stasis.

I agree about your view of stasis following each expansion. You will remember I feel each
new-sized brain has to be learned to utilize its new capacities.

DAVID: And it obviously came with a very functional complexification mechanism, causing the brain later to shrink. The whole process appears designed in advance of needs and to handle needs as required over time.

We have agreed that preceding brains would also have complexified. The earlier brain must have been plastic enough both to complexify and to expand, so sapiens brain was/is no different in that respect. Shrinkage is also part of the plasticity – just as the brain could add cells when needed, it could discard cells that were not needed. The whole process of complexification and expansion may go back to the design of a mechanism that enables all organs and organisms to “handle needs as required over time”. I have called it cellular intelligence. Your version used to be divine preprogramming or dabbling, though this has now been thrown into disarray by your theory that evolution has progressed through random mutations which God allows but does not design.

You still do not want to understand my view of mutations as DNA errors, corrected by God as He wishes during evolution.