Ape to Einstein? Exploring The Stoned Ape Theory
From the depths of ancient jungles to the forefront of modern neuroscience, the Stoned Ape Theory offers a provocative glimpse into the psychedelic origins of human consciousness.
Did magic mushrooms play a role in human evolution?
The Stoned Ape Theory, or “The Psychedelic Ape Theory,” is a controversial hypothesis that suggests that psychoactive substances, specifically psychedelic mushrooms, influenced the trajectory of our prehistoric ancestors’ cognitive development.
The theory argues that early humans consumed mind-altering plants, which led to an increased capacity for creative thinking that allowed for the emergence of language, complex social bonds, and the development of societies and cultures.
As exciting as this sounds, the Stoned Ape Theory is an unproven hypothesis, met with skepticism in the scientific community. There’s very little evidence to support the idea — but that hasn’t stopped scientists and psychonauts throughout the ages from making wild speculations.
The Stoned Ape Hypothesis In A Nutshell
American ethnobotanist and philosopher Terence McKenna first proposed the Stoned Ape Hypothesis in his book, Food of the Gods: The Search for the Original Tree of Knowledge (1992) as an answer to the question “How did the human brain triple in size within two million years?”
According to Mckenna, we have magic mushrooms to thank for “[bringing humans] out of the animal mind and into the world of articulated speech and imagination.”
His theory posits that the consumption of psychoactive mushrooms catalyzed the rapid advancement of our early ancestors' brain development. These psychedelic mushrooms and the cosmic journeys they produced induced a series of transformative changes in neural structures, allowing early hominids — and eventually, humans — to experience higher levels of consciousness than ever before.
Some aspects of his theory check out.
For example, studies on brain evolution show a distinct jump in brain development sometime around 2 million years ago, right before the introduction of the first Homo habilis. This species had a significantly more developed brain than the forest-dwelling hominids that preceded it.
It all started around 10 million years ago, as the Earth began a new cooling cycle. The dense forests of the African continent started receding — forming large expanses of grasslands in their wake.
These early forest-dwelling hominids — such as Australopithecus africanus — were forced to leave the receding jungles into the open Sahara in search of a new home and food to eat.
One such food was the psilocybin mushroom, which could be found growing from the droppings of grazing animals abundant in these grassland habitats.
It’s worth noting that the human brain hasn’t continued to increase in size over the past few thousand years. The size has remained relatively constant for the last 35,000 years or so.
Human Evolution 101
One of my favorite reads on the fascinating story of human evolution is Yuval Noah Harari’s book, Sapiens.
In this book, Harari discusses how our species, Homo sapiens, has evolved and adapted over the span of millennia to dominate the planet in a way that no other species has. And it’s all thanks to our ability to imagine and create things that do not exist in the material world, such as tools, religion, nations, laws, and money.
These concepts have shaped human history and continue to influence humans in the modern world today.
So, how did we get here?
The Sahelanthropus tchadensis is believed to be the earliest known hominid group and a possible ancestor of chimpanzees and humans that lived around 7 million years ago. These early hominids had ape-like and human-like features, leading scientists to believe that Sahelanthropus is a transitional species between apes and humans.
Fast forward to 2 million years ago, when the Homo genus first emerged.
This group includes the Homo habilis, which is believed to be the first humans to make and use tools. Another unique feature of Homo habilis is its brain size, which was larger than earlier hominids but still smaller than modern humans.
This suggests that Homo habilis had a more advanced cognitive ability than its predecessors, but it was not as advanced as modern humans.
The first humans to control fire?
That would be the Homo erectus, which appeared 1.8 million years ago.
These archaic humans had even larger brains, which helped them develop more complex social bonds, making them much better at adapting to different environments.
Subsequently, Homo erectus is believed to be the first human species to leave Africa and migrate to other parts of the world.
Homo sapiens came onto the scene about 300,000 years ago. Homo sapiens sapiens — also known as the modern humans — would eventually emerge as the only surviving subspecies of this group.
Compared to our earlier ancestors, our early Homo sapien relatives had significantly larger brains (1300–1500 cubic centimeters), a much more advanced nervous system, and a lighter postcranial skeleton that allowed for a long and lean body proportion for tropical environments.
As human ancestors evolved and spread across the globe, they also developed many cultural adaptations. Cultural adaptations refer to the changes in behavior that are learned through social interactions and responses to the environment. Significant cultural adaptations include tool-making, language, farming, and cooking.
These cultural adaptations allowed early humans to adapt to a wide variety of environments and to survive in changing conditions.
What scientists find baffling is that the human brain tripled in size (relative to body size) in just two million years. There are several theories for how this happened, and one of those is, of course, the subject of this article.
Arguments For the Stoned Ape Theory
As much as we love the idea that magic mushrooms are responsible for enlightening early human brains, there’s no scientific evidence to prove it.
Most arguments are purely speculative, as there’s no way for scientists to test these theories.
1. The Use Of Psychoactive Substances For Plant Medicine & Ritual
In support of the Stoned Ape Theory, some anthropologists point out the use of psychoactive substances, such as psilocybin, opium, ayahuasca, Amanita muscaria, and peyote, which have been used in many cultures for centuries in religious rituals and traditional medicine.
Stoned Ape Hypothesis supporters argue that it’s possible that these very practices could have been passed down from our ancient relatives.
2. Early Human Artistic Expression
In his book Food of the Gods, Mckenna argued that altered states of consciousness inspired early cave paintings.
Motifs of geometric patterns are common in prehistoric art worldwide, reminiscent of the fractal patterns seen in visual hallucinations under the influence of psychedelic drugs.
However, the purpose of early human art is not always clear, and there are many different interpretations.
Some researchers argue that early human art was primarily functional, serving as a means of communication or as a tool for hunting, warnings, or other practical tasks.
Others suggest that it was more symbolic or expressive, expressing identity, belief, or emotion — but there’s no definitive link to the use of mind-altering substances in creating these early artworks.
Criticisms Of the Stoned Ape Theory
The biggest critique of McKenna’s theory is that it’s based on untestable assumptions and lacks peer-reviewed research.
The evolution of human consciousness is a complex and multifaceted process influenced by many factors, including genetics, environment, and culture.
Critics emphasize that Mckenna’s hypothesis, although entertaining, oversimplifies the complicated nature of evolution and overlooks the wide range of factors that may have contributed to human cultural evolution.
Even Terence himself didn’t have a good answer to the question of how these psychoactive mushrooms were able to alter the genetic code of humans to facilitate such rapid brain growth across numerous generations.
Further Reading: Stoned Ape Theory
Food of the Gods: The Search for the Original Tree of Knowledge (Book by Terence McKenna)
Dennis McKenna on the Stoned Ape Theory (Fantastic Fungi)
Sapiens: A Brief History of Humankind (Book by Yuval Noah Harari)
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