Brain evolution
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Mirror neurons are used to imitate others and acquire language
BRAIN AND MUSIC
Brain Evolution and the Function of Music
The
Relationship of Music to the Melody of Speech and to Syntactic Processing Disorders in Aphasia
Two new empirical studies address the relationship between music and language. The
first
focuses on melody and uses research in phonetics to investigate the long-held notion that instrumental
music reflects speech patterns in a composer's native language. The second focuses on syntax and
addresses the relationship between musical and linguistic syntactic processing via the study of aphasia,
an approach that has been explored very little. The results of these two studies add to a growing body
of
evidence linking music and language with regard to structural patterns and brain
processing.
The Evolution of
Music in Comparative Perspective
In this paper, I briefly review some comparative data that provide an empirical basis
for research on the evolution of music making in humans. First, a brief comparison of music and language
leads to discussion of design features of music, suggesting a deep connection between the biology of
music
and language. I then selectively review data on animal "music." Examining sound production in
animals, we find examples of repeated convergent evolution or analogy (the evolution of vocal learning
of
complex songs in birds, whales, and seals). A fascinating but overlooked potential homology to
instrumental music is provided by manual percussion in African apes. Such comparative behavioral data,
combined with neuroscientific and developmental data, provide an important starting point for any
hypothesis about how or why human music evolved. Regarding these functional and phylogenetic questions,
I
discuss some previously proposed functions of music, including Pinker's "cheesecake"
hypothesis; Darwin's and others' sexual selection model; Dunbar's group "grooming"
hypothesis; and Trehub's caregiving model. I conclude that only the last hypothesis receives strong
support from currently available data. I end with a brief synopsis of Darwin's model of a songlike
musical "protolanguage," concluding that Darwin's model is consistent with much of the
available evidence concerning the evolution of both music and language. There is a rich future for
empirical investigations of the evolution of music, both in investigations of individual differences
among
humans, and in interspecific investigations of musical abilities in other animals, especially those of
our
ape cousins, about which we know little.
Universal Footprint: Power Laws
Dear Val,
What in the world could the answer be to the following question: " Our brains expanded at he same
rate
in (exponent about 1.5) evolution as did the antlers of giant deer and horns of giant sheep! ...
Why?"
And why are periglacial environments, environments poor to the naked eye, richer than tropical
environments,
which seem very, very rich?
How does the PERCEPTION of what's trash and what's treasure, of what's a resource and
what's
not, feed into the equation? Seemingly the bigger the brain, the more likely its owner is to see
resources
where smaller brained creatures obstacles and emptiness. But is this true?
Deer presumably inherit the strategies that tell them what is trash and what is treasure--what is food and
what is not. They don't make discoveries that turn yesterday's waste into tomorrow's
resource,
the way human inventors do. And deer don't have the repository of solutions inventors draw from, then
add their discoveries to--culture.
So why do the same formulae apply in the case of deer and of humans? Why do deer find the north, with its
eight months of scarcity, richer than the south, with its twelve months of lushness?
Where does the technology that produces clothing, shelter, and tools for hunting and harvesting fit?
What
analog of this technology is available to the deer?
Are deer antlers useful for anything--for scraping lichen and moss off of rocks, for example? Or are they
simply what most of us have always thought--gaudy displays of excess evolved to appeal to the females of
the
species?
And why does the gaudy display of excess show up so often in a cosmos that we think obeys strict laws of
frugality?
How does this extravagance fit into the notions of economy that underlie Paul Werbos' Laplaceian
math? And how does this excess production of new form fit into a universe that many
think
is ruled by the form-destroying processes of entropy? ~ Howard Bloom
Dear Howard,
You asked two questions: What in the world could the answer be to the following question:
"Our
brains expanded at he same rate in (exponent about 1.5) evolution as did the antlers of giant deer and
horns
of giant sheep! ... Why?"
And why are periglacial environments, environments poor to the naked eye, richer than tropical
environments, which seem very, very rich?
They are good questions, which I think I can answer. In the first, the similarity extends much beyond the
fact that both, horns and brains, grow within or from skull bones! Large antlers/horns as well as brains
stand, in an odd way, for supreme, highly adaptive all-round ability, for supreme competence and
confidence.
However, let me start at the real beginning.
Antlers as well as the cerebral cortex (the largest part of the brain) are both tissues of low growth
priority. That is, they only grow when the blood stream has supplied all other tissues with their required
energy and nutrients. Antlers and brains thus both depend for maximum growth on superabundant food
of the highest quality. The brain in addititon to that superlative nutrition requires hard, but
diverse exercise in order to grow. It's like a muscle: no exercise, no growth! The broader the
range of abilities mastered the larger the brain! Brain size is not related to excellence in a task, but
in many tasks. Therefore, very large brains can only occur together with an athletic body and large body
size. And that is the very picture of our wild, ice age ancestors from the upper Paleolithic in
the cold, but productive periglacial zones. (It also applies to Neanderthal). The average Cro-magnid,
athetic, six-foot plus, and with a brain 20% larger than moderns was a superior human specimen to Val
Geist
on every count!
As to antlers, they also grow only if there is lots and lots of excellent food. However, here is the rub!
In
deer societies the females occupy the most secure ground and graze the daylights out of it. For females
and
young the primary goal is security from predators, and they will gladly accept second rate food to achieve
that. Consequently, males cannot thrive on the land occupied by the females. If they want to eat well, as
they are driven to do as only large males are successful breeders so chosen by females, they must seek
superior feeding grounds. However superior feeding areas are insecure. That is, to eat well is associated
with much greater danger from predators and, consequently, more males get killed than females. Therefore,
the larger the antlers of the male, the better he has succeeded feeding in very dangerous areas while
outwitting and outrunning predators. Since antlers are tissues of low growth priority their size is
directly
related to superior competence of the male precisely the male the female will choose for mating.
There is no escape from this: to grow into a superior specimen the young male deer must leave the poor
feeding grounds of mother where he was born and raised and seek boldly, cleverly, persistently - the best
food in the most insecure, dangerous localities. His antler size proves his success as a hero! The bigger
the more heroic and smart his conduct.
That's within a species.
Big antlers turn on deer fames and big intelligence in human males turns on females. So big antlers and
big
brains are probably organs of sexual selection, formed by ladies choice!
Now antler size in deer and brain size in humans progress in size, stepwise from the equator outward
towards
the poles. Each step away from the Equatorial Forests towards the poles increases the climates seasonality
and severity as shown by Savannah, Steppe, Deserts, Temerate zones, Periglacial, Arctic/Alpine. Ungulates
and omnivores many times, but Primates only once, bud off discrete “species” or “forms” from the tropic to
the Arctic. Note: in this progression of new “forms” each has to del with the consequences of increased
seasonality, with increasing extremes in climate, with ever wider fluctuations temporally and
geographically
of resource abundance. Food availability and security demands are totally different in spring, than in
summer, than in fall, than in winter. The further from the equator, the greater the demand on the
diversity
of skills and information to be mastered and brain size keeps pace with that. Another important point: as
poulations are limited by the scarce food supplies of winter, they are increasingly overwhelmed by the
abundance of foods during the productivity pulse of summer. So, no productivity pulse in tropical moist
forests, some pulse in Savannah, good pulse in steppe, better pulse in temperate zones good, large pulse
in
cold temperate, sharp but tall productivity spike in the Arctic/Alpine. During the productivity spike
individuals enjoy freedome from want or luxury. The further north the greter the luxury except for time!
Towards the Arctic the spike becomes shorter and shorter not enough Time to grow! Summer in the Arctic is
very productive, but too short to allow luxurious body growth.
And another factor: in the tropics leaching drains fertility from the land making it nutrient poor except
where nutrients are washed into soils deposited by rivers alluvial soils. In the north glaciatons have
liberated fertility from ground up rock. Ergo, our glaciated north is filthy rich in fertility. Filthy
rich!
Therefore the progression of species adapts each species to incasing seasonal luxury totally missing in
the
moist tropics. In the tropics ferocious competition for nutrients drives species into narrow
specialization
increasing biodiversity. Each species, though is of minimum design and struggling to make ends meet. In
the
north, one species does what several species do in the tropics, lowering biodiversity. Also, logically,
each
northern species grows during the productivity pulse and stores fat for the bad times ahead in winter
lacking in tropical forms. Ergo, we are filthy fat and chimps and gorillas are not!
Now lets quickly go through the species progression south top north in the only primate lineage
anthropoids
- which was able to achieve this, what has been achieved many, many times by ungulates. Note the
rogression
inro climatic severity and its ecological repercussions.
- primitive tropical moist forest ancestor with chimp/bonobo adaptations holding the genetic foundations for human evolution.
- the Savannah-adapted gracile Australopithecus form, breaking free from territoriality by adapting to the “selfish herd”. Surface forager in the most productive tropical ecosystems. Climbs trees and builds nests for security at night.
- The first advance into the dry, seasonal step braking radically with the anthropoid adaptation by (a) being able to survive predators on the ground at night, (b) discovers underground feeding for stored plant foods (tubers, corms, bulbs, roots) which are only accessible through digging sticks which in turn need to be sculptured with stone tools from tough branches covered densely with sharp spines (tools to make tools) (c) begin to tap into the huge protein stores as represented by the ungulate biomass of the steppe. (d) almost certainly: begin to explore the fat and protein rich foods hidden! in the inter-tidal zones along ocean shores as are steppe plant foods. All this generates additional profound changes away from the chimp ancestor. This is the Homo habilis/erectus form, the first true humans.
- With the first major glacitation about 1.9 m y ago, the beginning of the Pleistocene, this new form hardens its steppe adaptations and bypassing the desert begins to invade de progressively the temperate zones. About a dozen or more major glaciations follow, desiccating Africa merciless and exterminating all human advances north of the Eurasian mountain chains again and again. Still spread to Europe and Asia persist. This is the 1.5 my progression of our parent species Homo erectus.
- Huge penultimate glaciation 225 000 y ago desiccates Africa crisp and our parent species cannot make it and dies out. Two branches of it however transform to supreme desert conditions, a gracile form (us) and a robust form (Neanderthal). Jump in brain size!
- Neanderthal first and the gracile form later, invade the herbivore-rich periglacial zones in Eurasia, develop advanced technology and soon culture as we know it. Both are biologically grotesque and fat Ice Age giants within a fauna of grotesque and fat Ice Age giants (its all dreadfully “biologica!”). Superlative luxury body and brain development in both forms till Neanderthal fades away, and the superlatively developed European specimen fade away with the end of the last glaciation, being replaced by a small-brained starvation culture (Mesolithic) followed by agriculture (followed by genetic decay, and loss of brain size etc).
- Meanwhile, one late-glacial branch of the graciles branches out into inner Asia and develops even more brain in a process of neotinization. The supremely cold adapted mongoloid people evolve that colonize the Arctic/Alpine and north America, but only with and after mega-faunal extinctions (earlier attempts by ur-caucasoids and Ainu failed!).
So much for the thumb-nail sketch! Note: no other primate went past the horrific barriers of the African
dry steppe! In crashing through we became humans.
So, antlers and brains both depend on ecological riches, and such are found increasingly the closer one
gets
to the fertile soils formed by glacial actions and warm, moist summers. However, the price to pay is
acquisition of competence to deal with increasingly more complex ecological demands.
Cheers, Val Geist
THE FUTURE OF OUR BRAINS IS THE POINT OF SIGULARITY
While Americans debate human evolution, the pace of evolution itself is about to explode, says Scientist and Futurist Ray Kurzweil. In this century, he and others say, humans will reach what they call "the Singularity": the moment when man and machine, humans and their technology, become one. Kurzweil foresees human intelligence vastly outstripped by computer intelligence and then wholly merged with that intelligence in this century, within a few decades.
A bot that passed the Turing Test
Software Tricks People into thinking It Is Human
I asked it if I am fat and
it said, "I don't know. You are a computer."
I decided to test the online version, which is supposedly a bit more stupid than the version that passed
the Turing test:
One of the disclaimers at the bottom of the page reads:
"PLEASE NOTE: Cleverbot learns from real people - things it says may seem inappropriate - use with
discretion, and at YOUR OWN RISK"
So I decided to have a chat
Me: "Should I lose weight?"
CleverBot: "You should."
... and ended like:
Me [angry and frustrated]: Do you think all women should starve?
CB: Yes.
Me: You are sexist.
CB: I know . And I don't care.
Ok, so, definitely, CleverBot passed the Turing test for me. And it has well learnt from men....