Sentences with phrase «hand bones»

The researchers first examined the trabeculae of hand bones of humans and chimpanzees.

«Discovery of 1.4 million - year - old fossil human hand bone closes human evolution gap.»

When the team scanned hand bones from four members of A. africanus that lived in South Africa between 2 million and 3 million years ago, they found that the pattern of the trabecular bone was asymmetrical, as in modern humans and Neandertals that use tools frequently (as they also show in their study).

Using a high - resolution CT scan — think of it as a 3 - D X-ray — their team documented that human hand bones show increased internal density in response to certain types of stress and repetitive motion, particularly that associated with the manufacture and use of stone tools.

They also have scanned hand bones of other members of Australopithecus, including Lucy's species, A. afarensis, but the pattern of use was not preserved in that species's trabeculae.

The shape of fossil hand bones found in Africa suggests the first toolmakers walked on Earth before humans did

Recent analysis of Neanderthal hand bones by Wes Niewoehner of California State University shows they had the manual dexterity to produce and use complex tools.

The 8 - inch fossil (above) of the 272 - vertebrate Tetrapodophis amplectus features tiny claws and elongated hand bones (inset) that researchers contend were likely used for burrowing.

Now, a University of Missouri researcher and her international team of colleagues have found a new hand bone from a human ancestor who roamed the earth in East Africa approximately 1.42 million years ago.

Xenicibis used its hefty hand bones for battle, swinging them like clubs, the researchers posit.

The researchers analyzed more than 150 H. naledi hand bones, including a nearly complete adult right hand that was missing just one wrist bone.

Human hand bones showed increased density in certain key spots associated with toolmaking.

Researchers examined the trabeculae of hand bones of humans and chimpanzees.

They created equations describing what goes on in the fluid - filled space between the finger bones and the hand bones — the suspected source of the cracking.

But a series of papers published in early 2015 have solidified an emerging paradigm shift in paleoanthropology — Australopithecus africanus and other Pleistocene hominins, traditionally considered not to have made stone tools, have a human - like trabecular bone pattern in their hand bones consistent with stone tool knapping and use.

The styloid process helps the hand bone lock into the wrist bones, allowing for greater amounts of pressure to be applied to the wrist and hand from a grasping thumb and fingers.

Indeed, two of the fossils — a hand bone and upper arm bone — showed wear and tear consistent with fighting.

Other birds use their wings as weapons, too, but none wield their hand bones like clubs.

«By looking at the claw structure, hand bones and foot bones, our general interpretation is that it is a mammal that lived on the ground surface or perhaps was capable of digging.»

In the report published online today in Science, husband - and - wife team Matthew Skinner and Tracy Kivell, both paleoanthropologists at the University of Kent and the Max Planck Institute for Evolutionary Anthropology, and their colleagues used CT scanners to examine the pattern of fossilized spongy bone tissue within finger and hand bones of hominins that lived 2 million to 3 million years ago.

A new method for analyzing CT scans of fossils, however, is giving paleoanthropologists a new, more detailed look at the internal structure of hand bones, revealing how their habitual handiwork shaped their hands during life.

And in 1997, a landmark study of a composite hand skeleton of Lucy's species, A. afarensis, suggested that Lucy lacked a full precision grip 3.1 million years ago, but that her species had developed several but not all of the traits in its hand bones that are associated with the precision grip required for habitual toolmaking.

By studying the hand bones of the Australopithecus africanus, researchers found that these ape - like human ancestors had human - like hands capable of using stone tools.

In 1994, her hand bone was found.

The hand bones of Stw 573 seem to be like those of modern humans in being relatively unspecialized, having a short palm and fingers compared to modern apes.

Melancholy explores the transference of music across generations and is comprised of bone dust combined with melted vinyl and shellac records, and shaped into fetal hand bones (using his grandmother's 78 rpm vinyl records), adolescent hand bones (made from his mother's 45 rpm vinyl records), and adult hand bones (made from artist's 33 rpm vinyl records).