The Surprising Science of Our Ever-Changing Traditions
Explore how traditions, ideas, and behaviors change through Darwinian processes of variation, selection, and transmission in this deep dive into cultural evolution.
Imagine a time-traveler from 500 years ago stepping into our world. They'd be bewildered by smartphones, confused by social media, and probably terrified by automobiles. Now imagine the reverse—you, suddenly transported to a 16th-century village. You wouldn't understand the customs, would struggle with the language, and might accidentally offend everyone with an inappropriate gesture. This dramatic difference between then and now illustrates a profound truth: culture evolves.
But what does it really mean for culture to "evolve"? We're not talking about cultures getting "better" or more "advanced" in a linear progression. Rather, much like biological species, culture changes through a process of variation, selection, and transmission. New words, technologies, and customs emerge; some catch on and spread while others fade into obscurity; and what remains gets passed to future generations, who modify it further 4 .
The study of cultural evolution represents a revolutionary scientific approach to understanding human society. By applying evolutionary principles to culture, researchers are uncovering why humans alone have created such complex technologies, diverse languages, and varied social systems across the globe. This emerging science helps explain everything from why some Instagram posts go viral while others don't, to how humanity progressed from stone tools to smartphones across millennia.
Cultural evolution operates through similar mechanisms as biological evolution but at a much faster pace, allowing for rapid adaptation and change.
Limited technology, local traditions
Rapid technological and social change
Global connectivity, accelerated cultural exchange
The idea that culture evolves isn't new—Charles Darwin himself recognized that customs and "inherited habits" contribute to human evolution 4 . But the formal study of cultural evolution as a science has gained significant momentum only in recent decades.
So what is culture, in evolutionary terms? Most researchers define it as "information capable of affecting individuals' behavior that they acquire from other members of their species through teaching, imitation, and other forms of social transmission" 4 . This information can include knowledge, beliefs, skills, attitudes, and values—essentially, the mental tools we get from others rather than inventing ourselves.
New cultural variants constantly appear through innovation, mistakes, or combination of existing ideas
Some variants become more common because they're more useful, memorable, or attractive
Successful variants are copied and passed on to others through social learning
Several powerful theories have emerged to explain how cultural evolution operates:
One of the most heated debates in cultural evolution concerns the role of high-fidelity copying—how accurately people need to imitate others for culture to accumulate. The traditional view, often called the "California School," emphasizes that precise copying is essential for cultural traditions to remain stable and accumulate improvements over time 6 . Without accurate imitation, they argue, innovations would be lost and culture couldn't become increasingly complex.
But is this really true? A competing "Paris School" of thought has challenged this view, arguing that high-fidelity copying is neither necessary nor sufficient to explain cultural complexity 6 . They point out that many traditions thrive despite imperfect transmission, and that cultural "attractors"—ideas that are intrinsically appealing or memorable—may shape culture more than copying accuracy.
Recent research has approached this debate by examining alternative pathways to cultural accumulation, particularly the concept of Distributed Adaptation (DA)—where knowledge is stored at the group level rather than in individual minds 6 . Unlike traditional models that focus on transmission chains between individuals, DA suggests that cultural information can be preserved and refined through collective processes.
Researchers have explored this through multiple approaches:
Examining historical sites for evidence of how skills were learned and maintained. For example, studies of stone tool-making sites suggest that novices might have learned by examining rejected artifacts and partial products left by multiple experts, rather than by perfectly imitating a single individual 6 .
Studying contemporary traditional societies to understand learning pathways. Researchers have documented how skills are often acquired through emulation (reproducing outcomes) rather than imitation (copying precise actions), using templates and resources produced by many group members 6 .
Creating computational simulations comparing how different learning mechanisms perform at maintaining cultural knowledge across generations. These models test whether populations using distributed knowledge can maintain complex traditions despite imperfect individual copying.
The findings from this research direction have been startling. Evidence suggests that high-fidelity copying is neither necessary nor sufficient for distributed adaptation 6 . Instead, several alternative pathways can maintain and even accumulate cultural knowledge:
Learners can reproduce complex skills by studying the products of these skills (like partially-made tools) without precisely copying the production actions. These templates may be produced and improved by multiple individuals over time 6 .
Knowledge can be distributed across group members with different specialties, no single person needs to master everything. Some groups maintain knowledge of rare events through distributed memories across elderly members, each remembering different aspects 6 .
Tools, structures, and environmental modifications can store cultural information across generations. An irrigation system or trail network embodies knowledge about terrain and water flow that persists beyond individual lifetimes 6 .
| Learning Mechanism | Description | Examples |
|---|---|---|
| High-fidelity Imitation | Copying actions precisely | Certain ritualized behaviors |
| Emulation | Reproducing outcomes without copying precise actions | Reconstructing tools from finished products |
| Distributed Adaptation | Knowledge emerges from collective contributions | Trail systems, collective decision-making |
| Evidence Type | Key Findings |
|---|---|
| Archaeological Records | Stone tool "workshops" with rejected items used as learning templates |
| Ethnographic Studies | Skills learned through emulation and exposure to multiple experts |
| Computational Models | Groups can maintain traditions without high-fidelity copying |
The implications are profound: human cultural uniqueness may stem less from our individual capacity for precise imitation and more from our ability to aggregate knowledge across minds, using both social and material resources to preserve and improve useful information 6 .
Cultural evolution researchers employ an diverse toolkit to investigate how ideas, behaviors, and traditions change over time.
| Tool or Database | Primary Use | What It Reveals About Cultural Evolution |
|---|---|---|
| D-PLACE Database | Comparing cultural practices across 1400+ pre-industrial societies | How social organization relates to subsistence, environment, and language 2 |
| CLICS² | Tracking colexification (same word for multiple concepts) across 1200+ languages | Deep patterns in how humans conceptualize the world 2 |
| World Values Survey | Measuring social, political & religious values across countries | How values change with economic development and between generations 2 |
| Global Terrorism Database | Documenting terrorist incidents worldwide since 1970 | How violent ideologies spread and evolve 2 |
| Cultural Evolution Simulation Models (in R) | Testing theoretical predictions computationally | How different transmission mechanisms affect cultural patterns 8 |
| Ethnographic Atlas | Coded variables on subsistence, social organization & kinship | Historical distribution of cultural practices 2 |
These tools enable researchers to move beyond speculation and gather rigorous evidence about cultural changes across different temporal and spatial scales. For example, the D-PLACE database allows scientists to test hypotheses about how environmental factors shape social norms, while CLICS² reveals unconscious conceptual connections preserved in language.
The science of cultural evolution reveals a powerful truth: our cultures are not static monuments to human achievement but dynamic, evolving systems. They change through processes of variation, selection, and transmission that bear both striking similarities to, and crucial differences from, biological evolution.
The discovery that cultural complexity may arise through distributed adaptation rather than just high-fidelity copying 6 represents a major shift in our understanding of what makes human culture unique. It suggests that our cultural achievements—from global digital networks to sophisticated technologies—emerge not just from brilliant inventors or perfect imitators, but from the aggregated contributions of many individuals, often across generations, using both social and material resources to preserve and build upon useful knowledge.
This perspective helps explain humanity's extraordinary ecological dominance while reminding us of our profound interdependence. No single person knows how to make a computer chip from scratch—the knowledge is distributed across countless specialists, reference materials, and manufacturing systems. Our cultural achievements truly are collective accomplishments.
As research continues, scientists are working to overcome conceptual challenges and develop better theoretical frameworks 7 . Future studies will likely explore how digital technologies are accelerating cultural evolution, how biological and cultural evolution continue to interact, and how understanding cultural evolution can help address global challenges like climate change and political conflict.
What remains clear is that culture—our species' most powerful adaptation—continues to evolve at an accelerating pace. Understanding how and why it changes may be key to shaping our collective future.
The Cultural Evolution Society (culturalevolution.org) connects researchers across disciplines, while resources like "Simulation Models of Cultural Evolution in R" 8 let you experiment with cultural evolution firsthand.