Tucked beneath forests and gardens, an underground network of fungal threads quietly shapes the world in ways we barely notice. These networks, known as mycelium, break down decaying matter, share nutrients between plants, and even “communicate” across vast distances. But scientists have recently uncovered something even stranger: fungi may also be capable of recognizing shapes and making decisions—without a brain.
It sounds like something out of a sci-fi novel, but researchers in Japan have demonstrated that the fungus Phanerochaete velutina responds differently when encountering distinct shapes like crosses and circles. Instead of growing aimlessly, the fungus adjusts its behavior based on the patterns it interacts with, suggesting a form of problem-solving intelligence.
This discovery challenges our understanding of what it means to “think” and raises a profound question: Could intelligence exist in forms we’ve never considered? And if so, what does that mean for the future of science, technology, and even artificial intelligence?
The Experiment: How Scientists Tested a Fungus’ Cognitive Abilities
Volume 72, December 2024, 101387
To test whether fungi can recognize shapes and make decisions, researchers in Japan designed a series of experiments using Phanerochaete velutina, a common wood-decaying fungus. They placed the fungus in a controlled environment with different geometric patterns, such as circles and crosses, and observed how it responded. What they found was remarkable: instead of growing randomly, the fungus altered its behavior depending on the shape it encountered.
When the fungal network encountered a cross, for example, it seemed to take a more direct and strategic approach, spreading efficiently across the structure. With circular shapes, however, it exhibited a different growth pattern, adjusting its distribution as if recognizing the distinction. These reactions weren’t random. The fungus appeared to “process” the shape and respond accordingly—something we typically associate with organisms that have brains or nervous systems.
Even more fascinating was the way the fungal network communicated these changes across its structure. Mycelium, the web-like threads that form a fungus’s underground network, acted almost like a primitive information highway, transmitting signals that influenced the organism’s overall behavior. The experiment suggests that fungi aren’t just passive organisms reacting to their environment in a mechanical way—they may have the ability to assess situations, recognize patterns, and make decisions in a decentralized manner.
This discovery raises an intriguing question: if a simple fungus can “solve” problems without a brain, what else might nature be capable of? It also challenges the assumption that intelligence is exclusive to animals with complex nervous systems. Instead, it suggests that cognition—at least in its most basic form—may exist in ways we’ve barely begun to understand.
How Do Fungi Process Information?
At first glance, the idea that a fungus can “think” seems absurd. After all, intelligence is typically associated with neurons, synapses, and the ability to store and recall information. But fungi operate differently. Their version of communication and decision-making lies within their vast mycelial network—a sprawling web of microscopic threads that grow beneath soil, wood, and other organic matter.
Scientists have long known that fungi use their mycelial networks to transport nutrients, detect environmental changes, and even form symbiotic relationships with plants. But recent research suggests these networks do much more than just exchange resources. When Phanerochaete velutina encountered different shapes in the experiment, it didn’t just react at a single point of contact. Instead, its entire network appeared to coordinate a response, adjusting growth patterns in a way that suggests a form of decentralized intelligence.
This isn’t the first time fungi have demonstrated surprising abilities. Studies on mycelium have shown that these networks transmit electrical impulses—similar in some ways to neural activity in animals. While fungi lack a central processing unit like a brain, their distributed network allows them to “sense” their surroundings, process information, and adapt accordingly. Some researchers believe that fungi even exhibit a primitive form of memory, enabling them to recognize and respond to familiar environmental cues more efficiently over time.
If true, this would mean that fungi are operating on an entirely different model of intelligence—one that doesn’t rely on neurons or a nervous system, but instead functions through interconnected biological networks. This challenges traditional definitions of cognition and suggests that problem-solving behavior may be far more widespread in nature than we previously imagined.
Intelligence Without a Brain: What Other Brainless Organisms Can Do
Fungi aren’t the only organisms that defy conventional ideas about intelligence. In recent years, scientists have discovered that several seemingly simple life forms—without brains or nervous systems—can solve problems, navigate mazes, and even “remember” past experiences.
One of the most famous examples is the slime mold Physarum polycephalum. This single-celled organism, often mistaken for a fungus, has stunned researchers by solving complex mazes in laboratory settings. When placed in a maze with food at different points, the slime mold finds the shortest, most efficient route to its meal—much like an algorithm used in computer networks. What’s more, it can “remember” past routes and optimize its path even faster the next time.
Plants, too, exhibit forms of problem-solving intelligence. Their roots, which grow in search of nutrients, can “decide” where to extend based on environmental signals. Some studies suggest that plants can even communicate distress signals through underground fungal networks, often referred to as the “Wood Wide Web.” This system allows trees and other plants to warn each other of potential threats like pests or drought, enabling them to take preemptive protective measures.
The discovery that Phanerochaete velutina can recognize shapes and adjust its growth accordingly places it in the same category as these other brainless yet surprisingly intelligent organisms. If a fungus can assess its surroundings and make decisions, what else might be possible in the microbial world? These findings push the boundaries of what we define as intelligence, suggesting that problem-solving and information processing aren’t exclusive to animals with brains. Instead, intelligence may exist in diverse and unexpected forms throughout nature.
Could Fungi Revolutionize Technology?
The idea that a fungus can recognize shapes and make decisions without a brain isn’t just a fascinating quirk of nature—it could have real-world applications. Scientists and engineers are already looking to fungi and other decentralized biological systems for inspiration in fields like computing, artificial intelligence, and sustainable technology.
One of the most promising areas of research is bio-computing. Traditional computers rely on silicon-based processors to perform calculations, but biological networks—like fungal mycelium—offer an alternative model. Because fungi process information in a decentralized way, scientists believe they could inspire more efficient computing systems, particularly in optimizing networks, solving logistical problems, and even improving artificial intelligence. Some researchers have proposed using fungal networks to develop “living circuits” that self-repair and adapt, unlike traditional hardware.
Beyond computing, fungal intelligence could also play a role in sustainable problem-solving. Mycelial networks are known for their ability to break down organic matter, filter pollutants, and even absorb heavy metals from contaminated environments. If fungi are capable of recognizing and responding to different patterns in their surroundings, they could potentially be used in environmental monitoring systems that detect and respond to pollutants or changing ecological conditions.
Perhaps most importantly, discoveries like this force us to rethink our definition of intelligence. We often assume that problem-solving requires a central brain, but nature has repeatedly shown us that intelligence takes many forms. Whether it’s a slime mold solving a maze, plant roots “choosing” optimal growth paths, or a fungus distinguishing between different shapes, these behaviors suggest that intelligence exists on a spectrum—one that extends far beyond humans and animals.
If fungi can recognize shapes and solve problems, what other abilities might they possess? And more importantly, what can we learn from them? As researchers continue to explore these questions, we may find that some of the most groundbreaking technological advancements of the future are inspired not by machines, but by the living, thinking networks beneath our feet.
The Future of Fungal Intelligence
The discovery that Phanerochaete velutina can recognize shapes and adjust its growth accordingly challenges everything we thought we knew about intelligence. Without a brain, nervous system, or even a single neuron, this fungus exhibits decision-making behaviors that seem almost cognitive. It joins a growing list of brainless organisms—like slime molds and plant root systems—that demonstrate problem-solving abilities once thought to be exclusive to animals.
Beyond the scientific fascination, this research opens the door to practical applications. From bio-computers that mimic mycelial networks to sustainable environmental solutions powered by fungi, these findings could revolutionize fields beyond biology. If fungi can process information, remember patterns, and adapt their growth, they could be harnessed for technology that is self-repairing, efficient, and resilient—something that even the most advanced artificial systems struggle to achieve.
But perhaps the most profound implication is how this challenges our definition of intelligence. We tend to measure cognition through human and animal behaviors, but what if intelligence exists in forms we’ve never fully considered? If a fungus can solve problems, what other hidden intelligences are thriving in the natural world, unnoticed and unexplored?
