JTEM is so reasonable wrote:
Primum Sapienti wrote:
Please tell the billions of people in the world who
don't have access to sea food that they can't exist.
As has been pointed out many times, but you have neither comprehension
nor retention, human brains have shrunk since the advent of civilization & the reliance on agriculture.
As has been pointed out, including by one of your own sock puppets, I do believe, the genetic mutation that allows us to synthesize DHA as well as
we do -- which sucks, btw -- isn't very old. "Molecular Dating" claims it's on the order of 80,000 years. Which means the entire history of Homo
is contained with the span of the most recent 80,000 years or, now get
this, your trademark lack of reading comprehension & retention is not
serving you nearly as well as you appear to believe.
You have no position here. You're merely contradicting.
As has been pointed out many times, you're ignoring brain organization.
Why are birds so capable despite small brains and some with no
regular fish in their diet?
https://www.science.org/doi/abs/10.1126/science.abe0536
Birds do have a brain cortex—and think
25 Sep 2020
Abstract
The term “birdbrain” used to be derogatory. But humans, with
their limited brain size, should have known better than to
use the meager proportions of the bird brain as an insult.
Part of the cause for derision is that the mantle, or pallium,
of the bird brain lacks the obvious layering that earned the
mammalian pallium its “cerebral cortex” label. However, birds,
and particularly corvids (such as ravens), are as cognitively
capable as monkeys (1) and even great apes (2). Because their
neurons are smaller, the pallium of songbirds and parrots
actually comprises many more information-processing neuronal
units than the equivalent-sized mammalian cortices (3). On page
1626 of this issue, Nieder et al. (4) show that the bird
pallium has neurons that represent what it perceives—a hallmark
of consciousness. And on page 1585 of this issue, Stacho et
al. (5) establish that the bird pallium has similar organization
to the mammalian cortex.
This rather significant, the sort of thing that aa tries to
ignore in favor of the just-so-story approach. Paper is public
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3619515/
2013 May 22
Brain reorganization, not relative brain size, primarily characterizes anthropoid brain evolution
Abstract
Comparative analyses of primate brain evolution have
highlighted changes in size and internal organization
as key factors underlying species diversity. It remains,
however, unclear (i) how much variation in mosaic brain
reorganization versus variation in relative brain size
contributes to explaining the structural neural diversity
observed across species, (ii) which mosaic changes
contribute most to explaining diversity, and (iii) what
the temporal origin, rates and processes are that underlie
evolutionary shifts in mosaic reorganization for
individual branches of the primate tree of life. We
address these questions by combining novel comparative
methods that allow assessing the temporal origin, rate and
process of evolutionary changes on individual branches of
the tree of life, with newly available data on volumes of
key brain structures (prefrontal cortex, frontal motor
areas and cerebrocerebellum) for a sample of 17 species
(including humans). We identify patterns of mosaic change
in brain evolution that mirror brain systems previously
identified by electrophysiological and anatomical
tract-tracing studies in non-human primates and functional
connectivity MRI studies in humans. Across more than
40 Myr of anthropoid primate evolution, mosaic changes
contribute more to explaining neural diversity than changes
in relative brain size, and different mosaic patterns are
differentially selected for when brains increase or decrease
in size. We identify lineage-specific evolutionary
specializations for all branches of the tree of life
covered by our sample and demonstrate deep evolutionary
roots for mosaic patterns associated with motor control and
learning.
Also significant (and also publicly accessible)...
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7485526/
Published online 2018 May 31
Normative brain size variation and brain shape diversity in humans
Abstract
Brain size variation over primate evolution and human
development is associated with shifts in the proportions
of different brain regions. Individual brain size can vary
almost twofold among typically developing humans, but the
consequences of this for brain organization remain poorly
understood. Using in vivo neuroimaging data from more than
3000 individuals, we find that larger human brains show
greater areal expansion in distributed frontoparietal
cortical networks and related subcortical regions than
in limbic, sensory, and motor systems. This areal
redistribution recapitulates cortical remodeling across
evolution, manifests by early childhood in humans, and
is linked to multiple markers of heightened metabolic
cost and neuronal connectivity. Thus, human brain shape
is systematically coupled to naturally occurring
variations in brain size through a scaling map that
integrates spatiotemporally diverse aspects of
neurobiology.
The aa idea of science is to ignore contradictory evidence and
resort to snide remarks.
--- SoupGate-Win32 v1.05
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