Ants May Hold the Clues Why The Human Brain Decreased In Size 3,000 Years Ago – Scientists Say

Jan Bartek – AncientPages.com – The brain is the most complex organ in the human body. Now, a new study has brought us closer to understanding some of its evolution. It shows that human brains decreased in size approximately 3,000 years ago. By studying ants as models to illustrate why brains may increase or decrease in size, the researchers hypothesize that brain shrinkage parallels the expansion of collective intelligence in human societies.

Studying and understanding the causes and consequences of brain evolution helps us understand the nature of humanity. It is well documented that human brains have increased in size over the course of our evolutionary history. Less appreciated is the fact that human brains have decreased in size since the Pleistocene. When exactly these changes happened, or why, was not well known.

Ants May Hold the Clues Why The Human Brain Decreased In Size 3,000 Years Ago - Scientists Say

Credit: Public Domain

“A surprising fact about humans today is that our brains are smaller compared to the brains of our Pleistocene ancestors. Why our brains have reduced in size has been a big mystery for anthropologists,” explained co-author Dr. Jeremy DeSilva, from Dartmouth College.

To disentangle this mystery, a team of researchers from different academic fields set out to study the historical patterns of human brain evolution, comparing their findings with what is known in ant societies to offer broad insights.

“A biological anthropologist and a behavioral ecologist and evolutionary neurobiologist began sharing their thoughts on brain evolution and found bridging research on humans and ants might help identify what is possible in nature,” said co-author Dr. James Traniello, from Boston University.

Their paper, published in Frontiers in Ecology and Evolution, sheds new light on the evolution of our brain.

A recent size decrease

The researchers applied a change-point analysis to a dataset of 985 fossil and modern human crania. They found that human brains increased in size 2.1 million years ago and 1.5 million years ago, during the Pleistocene, but decreased in size around 3,000 years ago (Holocene), which is more recent than previous estimates.

“Most people are aware that humans have unusually large brains—significantly larger than predicted from our body size. In our deep evolutionary history, human brain size dramatically increased,” said Traniello. “The reduction in human brain size 3,000 years ago was unexpected.”

The timing of size increase coincides with what is previously known about the early evolution of Homo and the technical advancements that led to; for example, better diet and nutrition and larger social groups.

As for the decrease in brain size, the interdisciplinary team of researchers propose a new hypothesis, finding clues within ant societies.

What could ants teach us about human brain evolution?

“We propose that ants can provide diverse models to understand why brains may increase or decrease in size due to social life. Understanding why brains increase or decrease is difficult to study using only fossils,” explained Traniello.

Studying computational models and patterns of worker ant brain size, structure, and energy use in some ant clades, such as the Oecophylla weaver ant, Atta leafcutter ants, or the common garden ant Formica, showed that group-level cognition and division of labor may select for adaptive brain size variation. This means that within a social group where knowledge is shared or individuals are specialists at certain tasks, brains may adapt to become more efficient, such as decreasing in size.

“Ant and human societies are very different and have taken different routes in social evolution,” Traniello said. “Nevertheless, ants also share with humans important aspects of social life such as group decision-making and division of labor, as well as the production of their own food (agriculture). These similarities can broadly inform us of the factors that may influence changes in human brain size.”

Brains use up a lot of energy, and smaller brains use less energy. The externalization of knowledge in human societies, thus needing less energy to store a lot of information as individuals, may have favored a decrease in brain size.

“We propose that this decrease was due to increased reliance on collective intelligence, the idea that a group of people is smarter than the smartest person in the group, often called the ‘wisdom of the crowds,'” added Traniello.

DeSilva concluded, “We look forward to having our hypothesis tested as additional data become available.”

paper

Written by Jan Bartek – AncientPages.com Staff Writer

Related Posts

Andalusia Was First Inhabited By Neolithic People From The Southern Part Of The Iberian Peninsula 6,200 Years Ago

Conny Waters – AncientPages.com – The island of San Fernando, Cadiz in Andalusia, was home to the first Neolithic farmers and shepherds who decided to permanently settle there around 6,200 years ago. They practised shellfish collection and consumption all year round, with a preference for winter. Location of Campo de Hockey site in southern Iberian […]

Unknown Bronze Age Settlement Discovered Accidentally In Heimberg, Switzerland

Jan Bartek – AncientPages.com – Sometimes, when archaeologists look for one thing, they find something entirely different. This is exactly what happened in Switzerland when researchers were excavating, hoping to find an ancient Roman brick workshop, but they unearthed a previously unknown Bronze Age settlement instead. The excavation in Heimberg, on the right edge of […]

Unexplained Mystery Of The Dangerous Invisible And Unidentifiable Enemy In A French Town

Unexplained Mystery Of The Dangerous Invisible Enemy In A French Town

Ellen Lloyd – AncientPages.com – It was an ordinary day in a small, sleepy town in France. There were no indications anything strange was about to happen. Yet, an inexplicable and extraordinary event left the unsuspecting residents completely bewildered and unsure of what was unfolding. The situation that unfolded was indeed unusual, if not bizarre. […]

Rare 2,800-Year-Old ᴀssyrian Scarab Amulet Found In Lower Galilee

Jan Bartek – AncientPages.com – Erez Avrahamov, a 45-year-old inhabitant of Peduel, made an incredible discovery while hiking in the Tabor Stream Nature Reserve located in Lower Galilee. He stumbled upon an ancient seal shaped like a scarab that dates back to the First Temple period. Credit: Israel Antiquities Authority This ancient artifact is as […]

Dinas Powys: Late ‘Antique Hillfort Phenomenon’ In Post-Roman Western Britain

Conny Waters – AncientPages.com – Dinas Powys, Glamorgan, located about 9km southwest of Cardiff, is a small inland fort of approximately 0.35ha. The hillfort was first excavated by a team of archaeologists led by Leslie Alcock from 1954 through to 1958. The site is often referenced as a prime example of elite settlements in post-Roman […]

Puzzling Vasconic Inscription On Ancient Irulegi Hand Resembles Basque Language

Puzzling Vasconic Inscription On Ancient Irulegi Hand Resembles Basque Language

Jan Bartek – AncientPages.com – A few years ago, archaeologists excavating an Iron Age site known as Irulegi in northern Spain discovered a flat bronze artifact shaped like a human hand. After careful cleaning, they found it bore inscriptions of words from a Vasconic language. This language family includes Basque and several other languages that […]