On Jan 30, 8:47 pm, johac <jhachm...@sbcglobal.com> wrote:

But I'm sure that the argument is far from over.

---
'Hobbit' human 'is a new species'

The tiny skeletal remains of human "Hobbits" found on an Indonesian
island belong to a completely new branch of our family tree, a study has
found.

The finds caused a sensation when they were announced to the world in
2004.

But some researchers argued the bones belonged to a modern human with a
combination of small stature and a brain disorder called microcephaly.

That claim is rejected by the latest study, which compares the tiny
people with modern microcephalics.

Microcephaly is a rare pathological condition in humans characterised by
a small brain and cognitive impairment.

Dang. I was sure it was one of Dook's ancestors ;-). You must admit it
would have explained a lot.

In the new study, Dean Falk, of Florida State University, and her
colleagues say the remains are those of a completely separate human
species: Homo floresiensis .

They have published their findings in Proceedings of the National
Academy of Sciences.

The remains at the centre of the Hobbit controversy were discovered at
Liang Bua, a limestone cave on the Indonesian island of Flores, in 2003.

Researchers found one near-complete skeleton, which they named LB1,
along with the remains of at least eight other individuals.

The specimens were nicknamed Hobbits after the tiny creatures in JRR
Tolkien's Lord of the Rings trilogy.

Computer model

The researchers believe the 1m-tall (3ft) people evolved from an unknown
small-bodied, small-brained ancestor, which they think became small in
stature to cope with the limited supply of food on the island.

The little humans are thought to have survived until about 12,000 years
ago, when a volcanic eruption devastated the region.

LB1 possessed a brain size of around 400 cubic cm (24 cu inches) - about
the same as that of a chimp.

Long arms, a sloping chin and other primitive features suggested
affinities to ancient human species such as Homo habilis .

Professor Falk's analysis used the skulls of 10 normal humans, nine
microcephalics, one dwarf and the Hobbit.

The brain leaves a mirror image imprinted onto the skull, from which
anatomists can reconstruct its shape. The resulting brain cast is called
an endocast.

Professor Falk's team scanned all 21 skulls into a computer and then
created a "virtual endocast" using specialist software.

Then, they used statistical techniques to study shape differences
between the brain casts and to classify them into two different groups:
one microcephalic, the other normal.

Advanced tools

The dwarf's brain fell into the microcephalic category, while the Hobbit
brain fell into the normal group - despite its small size.

In other ways, however, the Hobbit brain is unique, which is consistent
with its attribution to a new species.

Archaeologists had found sophisticated tools and evidence of a fire near
the remains of the 1m-tall adult female.

"People refused to believe that someone with that small of a brain could
make the tools," said Professor Falk.

She said the Hobbit brain was nothing like that of a microcephalic and
was advanced in a way that is different from living humans.

A previous study of LB1's endocast revealed that large parts of the
frontal lobe and other anatomical features were consistent with higher
cognitive processes.

"LB1 has a highly evolved brain," said Professor Falk. "It didn't get
bigger, it got rewired and reorganised, and that's very interesting."

This apparently contrasts with LB1's other "primitive" anatomical
features.

In September last year, Professor Teuku Jacob and colleagues published a
scientific study in Proceedings of the National Academy of Sciences
which claimed the Hobbit showed similarities to living pygmies and to
microcephalics.

However, a different analysis by Australian researchers, published last
year in the Journal of Human Evolution, supported the idea that LB1 was
a creature new to science.

---http://news.bbc.co.uk/2/hi/science/nature/6311619.stm
--
John Hachmann aa #1782

"Those who can make you believe absurdities can make you commit atrocities"
-Voltaire

Contact - Throw a .net over the .com

Very interesting. Thanks for the post.

Bill