OCT 08, 2015 4:44 AM PDT

Tracking the Evolution of Hearing and Language

When the subject of early human species comes up, the focus tends to be on bones. Researchers want to know how big they were, how they looked. Other research focuses on what they could make or do. Did they have tools, or weapons? Could they hunt, did they roam or were they settled in one area?
A partial skull used in mapping the ear structure of early humans
There’s some new research though that looks at the hearing ability of two early hominin species Australopithecus africanus and Paranthropus robustus. These two species walked the earth around 2 million years ago. Rolf Quam, an assistant professor of anthropology at Binghamton University along with colleagues from around the globe, were able to reconstruct fossilized remains to determine the level of sensory perception these early species may have had.

The remains came from the two sites in South Africa and the team took a high tech approach. Using CT scans of the internal ear structures, the team created virtual computer models. Their results point to these hominids having hearing abilities similar to modern chimpanzees, but with some slight differences.
Humans have better hearing than any other primate and the ability we have to process wider frequencies is how humans developed language. That is why chimps, no matter how well trained, will not learn to speak.

"We know that the hearing patterns, or audiograms, in chimpanzees and humans are distinct because their hearing abilities have been measured in the laboratory in living subjects," said Quam. "So we were interested in finding out when this human-like hearing pattern first emerged during our evolutionary history."

The research on the hominin species from South Africa, followed previous research that Quam and his team had done on fossils recovered in the site Sima de Los Huesos, or Pit of the Bones in Spain. Those fossils are not as old as the ones in South Africa, but Quam’s research into them found that the Spanish hominins probably had the same hearing ability as living humans today have. Seeing that the older species from South Africa had not yet reached that point was a crucial piece of the evolutionary timeline.

Location mattered as well. Based on the information the team had on their diets and the resources available for food, the South African species likely dwelled on the savanna. Since sound does not travel as far in an open environment such as that, the team believes these primates had short range communication abilities.

Quam was quick to point out in an interview with Reuters that his research did not find that these early humans had actual language. "I want to be clear that we are not arguing that these early humans had language, which implies a symbolic content," Quam said. "Certainly they could communicate vocally. All primates do. But human language emerged during our evolutionary history at some time after the existence of these early humans." 

The team hopes to be able to compare their findings with the newly discovered species Homo naledi, which was uncovered in another dig site in South Africa. The study was published on Sept. 25 in the journal Science Advances. See the video below to learn more:
 
About the Author
  • I'm a writer living in the Boston area. My interests include cancer research, cardiology and neuroscience. I want to be part of using the Internet and social media to educate professionals and patients in a collaborative environment.
You May Also Like
AUG 11, 2021
Neuroscience
Beige Fat Cells Protect the Brain from Dementia
AUG 11, 2021
Beige Fat Cells Protect the Brain from Dementia
‘Beige’ fat reduces inflammation in mouse brains, and may provide protection from dementia. The correspondin ...
SEP 01, 2021
Health & Medicine
Does Regular Cannabis Affect Brain Function? Sometimes in a Good Way
SEP 01, 2021
Does Regular Cannabis Affect Brain Function? Sometimes in a Good Way
With cannabis now legal in many parts of the world, an increasing number of people now count as regular users of the dru ...
SEP 21, 2021
Health & Medicine
The (Not So) Secret To A Happy Life: Fruits, Vegetables, and Exercise
SEP 21, 2021
The (Not So) Secret To A Happy Life: Fruits, Vegetables, and Exercise
Researchers uncover causal link between a healthy lifestyle and satisfaction with life.
SEP 28, 2021
Neuroscience
Is morality all about taste?
SEP 28, 2021
Is morality all about taste?
Researchers establish inhibited tongue motor capacity in response to moral transgression
OCT 15, 2021
Health & Medicine
Anti-seizure properties found in the Cannabinoid CBGA
OCT 15, 2021
Anti-seizure properties found in the Cannabinoid CBGA
A growing body of research suggests cannabis’s effectiveness in minimizing seizure activity, but a recent study hi ...
OCT 19, 2021
Cardiology
Can Optimism Save Lives?
OCT 19, 2021
Can Optimism Save Lives?
Throughout history, optimism has been viewed as a cornerstone of resilience. In the words of Helen Keller, optimism is t ...
Loading Comments...