In today’s corporate ecosystem, digitalization has led us to believe that our capacity to relate is absolutely infinite. Through messaging platforms, emails, and internal networks, any professional interacts with dozens, or even hundreds of people over a work week. However, social health is not measured by the metric quantity of connections, but by their depth and security. Neuroscience and evolutionary anthropology warn us that the human brain has a strict cognitive limit for managing stable relationships, a concept scientifically known as Dunbar‘s number. Ignoring this biological boundary generates a silent exhaustion that directly affects the well-being of the workforce.
The evolutionary origin of our social capacity
To understand this biological phenomenon, we must look at the evolution of our species. In the 1990s, British anthropologist Robin Dunbar investigated the anatomical correlation between the size of the primate neocortex (the area responsible for conscious thought and language) and the size of their social groups. By extrapolating these biometric data to the human brain, he discovered that our neurological capacity only allows us to maintain a maximum of approximately one hundred and fifty significant relationships simultaneously.
Beyond the limit established by Dunbar, the brain lacks the memory, time, and emotional processing capacity required to remember who each individual is, what relationship links us to that person, and what the dynamics of trust and reciprocity are. In ancient hunter-gatherer societies, tribes naturally and peacefully divided upon exceeding this number, precisely because biology allowed for no more.
Cognitive overload and relational stress
Nowadays, modern organizations force employees to operate well above this anthropological threshold. When a user in the corporate environment must collaborate with three hundred or four hundred different colleagues, the nervous system experiences what is called social cognitive overload. By exceeding Dunbar‘s theoretical number, interactions inevitably lose their empathic depth.
The brain, unable to process so many bonds with quality, enters a state of relational stress that elevates basal cortisol and blocks the secretion of oxytocin, the hormone responsible for attachment. This scientifically explains why, in large companies, staff often experience a profound sense of isolation, loneliness, or apathy, despite being surrounded by hundreds of people. Forcing our biology beyond Dunbar‘s number dilutes psychological safety and fosters an environment where bonds become transactional, cold, and superficial, triggering levels of social anxiety.
The layered structure of human relationships
Evolutionary theory does not only talk about a maximum limit, but also structures our social network in concentric layers of intimacy that require different investments of time. According to Dunbar‘s model, our brain organizes bonds into very defined groups: five people of maximum trust (the intimate support circle), fifteen good friends (the sympathy group), fifty close people, and finally, the one hundred and fifty stable connections.
Applying this biological architecture to the working world is fundamental for designing efficient and mentally healthy departments. High-performance teams—those where the worker experiences true trust, absence of fear of error, and mutual support—rarely exceed fifteen people. Respecting Dunbar‘s layers when organizing project groups or departments avoids compassion fatigue and ensures that each member feels part of a manageable, safe, and approachable “tribe.”
Designing the company for the human brain
How can organizations protect the social health of their teams against this immutable neurological reality? The answer lies in functional decentralization. Instead of forcing the workforce to interact in a massive and chaotic corporate network, the company structure should be divided into autonomous units that do not exceed Dunbar‘s limit.
Organizational sociology has shown that when a workplace exceeds one hundred and fifty people, natural camaraderie breaks down, anonymity appears, and strict bureaucratic rules must be implemented to maintain order. Dividing people into smaller, cohesive subgroups makes it easier for the brain to recognize its peers instantly, fostering a genuine climate of belonging and reducing psychosocial stress.
Conclusion: reconnecting with our nature
In short, technology can connect thousands of individuals in milliseconds, but our physiology remains the same as it was thousands of years ago. Recognizing the existence of Dunbar‘s number is an act of respect toward our human nature.
Promoting relational health implies ceasing to demand that every professional act as a computer server with unlimited capacity. Caring for our social environment means prioritizing human quality, fostering true trust in small teams, and accepting that, as the principle of Dunbar demonstrates, our neurological limits are, in fact, the necessary framework that protects our emotional stability.