PREHISTORIC TEETH OFFER EARLY EVIDENCE FOR RIGHT-HANDEDNESS

 Notes on teeth of a Homo habilis fossil that go back 1.8 million years could be the earliest known proof of right-handedness.


"We think that informs us something further about lateralization of the mind," says David Frayer, teacher emeritus of sociology at the College of Kansas and the lead writer of the study. "We currently know that Homo habilis had mind lateralization and was more such as us compared to such as apes. This prolongs it to handedness, which is key."


The searchings for were released online today in the prestigious Journal of Human Development. The scientists made the exploration after evaluating small cut notes, or labial striations, which are the lip side of the anterior teeth in an undamaged top jaw fossil, known as OH-65, found in a stream network of the Olduvai Canyon in Tanzania.

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Frayer says amongst the network of deep striations found just on the lip face of the top front teeth, most cut notes veered from left to the right. Evaluation of the notes makes it most likely they originated from when OH-65 used a device with its right-hand man to cut food it was keeping in its mouth while drawing with the left hand.


The scrapes can be seen with the nude eye, but a microscopic lense was used to determine their positioning and to measure their angulation.


"Speculative work has revealed these scrapes were probably produced when a rock device was used to process material gripped in between the anterior teeth and the device sometimes struck the labial face, leaving a long-term note on the tooth's surface," Frayer says.


Based upon the instructions of the notes, it is apparent the Homo habilis was right-handed. It is an example of one, but because this is the first potential proof of a leading handed pre-Neanderthal, Frayer says, the study could lead to a look for the notes in various other very early Homo fossils.


"Handedness and language are controlled by various hereditary systems, but there's a weak connection in between both because both functions originate left wing side of the mind," he includes. "One specimen doesn't make an incontrovertible situation, but as more research is done and more discoveries are made, we anticipate that right-handedness, cortical reorganization and language capacity will be revealed to be essential elements in the beginning of our genus."


Several lines of research indicate the possibility that mind reorganization, the use devices and use a leading hand occurred very early in the human family tree. Today, scientists estimate that 90 percent of people are right-handed, and this varies from apes, which are better to a 50-50 proportion. Previously, no one searched for directionality of striations in the earliest specimens standing for our transformative family tree.

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