16.7 C
New York
Sunday, November 17, 2024
pCloud Premium

New Child Fossil Teeth Reveal Why Humans Developed an Unusually Long Childhood



New Child Fossil Teeth Reveal Why Humans Developed an Unusually Long Childhood

A study by the European Synchrotron Radiation Facility (ESRF) suggests that early Homo species may have experienced extended childhoods well before significant brain enlargement, challenging longstanding evolutionary assumptions. The findings are based on the dental development of a nearly complete sub-adult Homo skull, unearthed at the Dmanisi site in Georgia and dated to 1.77 million years ago. The ESRF team, collaborating with the University of Zurich and the Georgian National Museum, utilised advanced synchrotron imaging to study the specimen’s teeth, providing unprecedented insight into the growth patterns of early humans.

Dental Growth as a Key to Evolution

The research examined dental microstructures, which, like tree rings, record daily growth, thus offering insight into overall physical development. Christoph Zollikofer, the study’s lead author from the University of Zurich, explains that teeth fossilise well and serve as a reliable record of childhood growth. According to Paul Tafforeau of ESRF, who co-authored the study, dental development often correlates with broader bodily growth, including brain development.

Analyses revealed a unique pattern in which back teeth matured more slowly than front teeth in the specimen’s first five years. This pattern, combined with an observed reliance on adult caregivers, supports a hypothesis that early Homo juveniles may have been dependent on adults for extended periods, like modern humans.

Implications for the “Big Brain-Long Childhood” Hypothesis

The discovery could reshape how the “big brain-long childhood” hypothesis is understood. Previous theories held that prolonged childhoods evolved primarily due to increases in brain size. Yet, this Dmanisi specimen, while having a smaller brain comparable to great apes, showed evidence of prolonged support by older group members, possibly indicating that communal care, rather than brain size, was the initial driver of extended development.

David Lordkipanidze of the Georgian National Museum observed that one older Dmanisi individual survived toothless, implying social structures where knowledge was passed across generations. This evolutionary framework suggests that the extended childhood emerged first, enabling cultural transmission, which subsequently favoured brain growth and delayed maturation.

The findings, published in Nature, indicate that the gradual evolution of extended childhoods may have played a foundational role in early human development and social cohesion.

 



Source link

Odisha Expo
Odisha Expohttps://www.odishaexpo.com
Odisha Expo is one of the Largest News Aggregator of Odisha, Stay Updated about the latest news with Odisha Expo from around the world. Stay hooked for more updates.

Related Articles

Stay Connected

0FansLike
0FollowersFollow
0SubscribersSubscribe
Best Lifetime Deals on SaaSspot_img

Latest Articles

APEC closes in Peru with China’s President Xi front and centre as Trump whiplash...

0
Lima, After two days of meetings in Lima that rarely ventured beyond platitudes in discussing the strategies of robust economic engagement, the...

‌Reports, AUS vs IND | Huge blow for India as Gill doubtful for opener...

0
In the latest report from Times of India, Indian batter Shubman Gill has injured himself while fielding at the slip cordon during the...

Election denialism emerges on the left after Trump’s win

0
In the days following the presidential election, a familiar strain of denialism and conspiracy thinking began to emerge in the corners of some...

England 20-29 South Africa: Hosts lose at Allianz Stadium

0
England: Steward; Freeman, Lawrence, Slade, Sleightholme; M Smith, Van Poortvliet; Genge, George (capt), Stuart, Itoje, Martin, Cunningham-South, Underhill, Earl.Replacements: Cowan-Dickie, Baxter, Cole, Isiekwe,...

Research points to climate change’s role in high cases

0
The SummaryNearly 12 million cases of dengue fever have been recorded in the Americas this year, close to triple last year’s total.New research...