Judd Antin - Research. In this project I examine the influence of information about competence on contributions in online social dilemmas. In any real world situation, individuals will vary in terms of their competence, where competence is defined as having sufficient knowledge or skills to act effectively in a given context. Once we challenge the assumption that all individuals are fully and equally competent, perceptions of competence become essential influences to behavior in social dilemma situations. Precisely how perceptions of competence figure into decisions to contribute or free-ride has largely been neglected as a topic of study, however. This is the main focus of the proposed research.
This multi-method study will examine the relationships between competence beliefs and contribution behavior using laboratory experiments and qualitative interviews. Asian Neanderthals, Humans Mated. - The oldest modern human remains from East Asia have been found and date to at least 100,000 years ago. - The structure of the fossils and age all suggest that modern humans interbred with Neanderthals. - The findings also reveal that modern humans were established in East Asia much earlier than in Europe. Early modern humans mated with Neanderthals and possibly other archaic hominid species from Asia at least 100,000 years ago, according to a new study that describes human remains from that period in South China. The remains are the oldest modern human fossils in East Asia and predate, by over 60,000 years, the oldest previously known modern human remains in the region.
SEE ALSO: Prehistoric Jewelry Reveals Neanderthal Fashion Sense The fossils -- a chin and related teeth -- belonged to a modern human that also featured more robust Neanderthal-type characteristics, indicates the study, published in the latest Proceedings of the National Academy of Sciences. Neanderthal gene found in human DNA of people living out of Africa - Times Online. Neanderthals, Humans Interbred, DNA Proves. - A newly mapped Neanderthal genome provides strong evidence that humans and Neanderthals interbred. - Between 1-4 percent of the DNA of many humans living today likely came from Neanderthals. - People of European and Asian heritage are most likely to carry the Neanderthal genes.
It's official: Most of us are part Neanderthal. The first draft sequence of the Neanderthal genome has provided the strongest evidence yet that modern humans and Neanderthals interbred and that all non-Africans today have Neanderthal gene fragments in their genetic codes. Although the Neanderthal contribution to the DNA of these individuals is estimated at being just one to four percent of the total, the finding, published in the latest issue of the journal Science, helps to resolve the long-standing controversy over whether or not humans mated with Neanderthals when the two groups encountered each other outside of Africa. It also gives new life to Neanderthals that, as a species, went extinct 30,000 years ago. Toba catastrophe theory. The Toba supereruption was a supervolcanic eruption that occurred some time between 69,000 and 77,000 years ago at the site of present-day Lake Toba (Sumatra, Indonesia).
It is one of the Earth's largest known eruptions. The Toba catastrophe hypothesis holds that this event caused a global volcanic winter of 6–10 years and possibly a 1,000-year-long cooling episode. The Toba event is the most closely studied super-eruption.[2][3][4] In 1993, science journalist Ann Gibbons suggested a link between the eruption and a bottleneck in human evolution, and Michael R. Rampino of New York University and Stephen Self of the University of Hawaii at Manoa gave support to the idea. In 1998, the bottleneck theory was further developed by Stanley H. Ambrose of the University of Illinois at Urbana-Champaign. Supereruption[edit] The Toba eruption took place in Indonesia and deposited an ash layer approximately 15 centimetres thick over the whole of South Asia. Volcanic winter and cooling[edit] National Geographic Adventure Mag: Genographic, Spencer Wells. Spencer Wells is risking life and limb to collect DNA from the most isolated, remote peoples on the planet.
Five years, 100,000 samples, and 40 million dollars later, he'll have a new road map to human history. By Michael Shnayerson Spencer Wells knows exactly where he wants to go next: the Tibesti mountains. He wants to fly to Libya, now that it's open to Westerners again, then hail a camel caravan across the Libyan desert to Chad, where the seven inactive volcanoes of the Tibesti rise 11,000 feet (3,353 meters) from the central Sahara: a private world of crags and chasms seldom seen by more than a handful of outsiders.
Like any intrepid traveler, he's unfazed by the prospect of deadly North African windstorms and burning desert heat. The land mines near the border of Libya and Chad do pose a problem, but local guides can thread a path. Wells has a nifty and novel idea to help fund and publicize the project. For years, scientists had studied blood for genealogical clues. Evolution of Modern Humans: Early Modern Homo sapiens. Early Modern Homo sapiens All people today are classified as Homo sapiens. Our species of humans first began to evolve nearly 200,000 years ago in association with technologies not unlike those of the early Neandertals.
It is now clear that early Homo sapiens, or modern humans, did not come after the Neandertals but were their contemporaries. However, it is likely that both modern humans and Neandertals descended from Homo heidelbergensis. Compared to the Neandertals and other late archaic humans, modern humans generally have more delicate skeletons. Their skulls are more rounded and their brow ridges generally protrude much less. Replacement Model Arguments There are two sources of evidence supporting the replacement model--the fossil record and DNA. Homo sapiens began migrating into the lower latitudes of East Asia by at least 70,000 years ago. The Genographic Project. Human Ancestry - Made Easy. THE GENETIC HISTORY OF EUROPE BC 6000 -BC 1000. The Truth About British DNA Ancestry. Genealogist Dr.Spencer Wells talks about Humans Genetics. Spencer Wells: Building a family tree for all humanity.