About fifteen years ago, Peter Turchin, a theoretical biologist turned historian, made a startling prediction: the United States was heading toward a serious internal crisis around 2020. He foresaw hardening polarization, a breakdown in trust toward shared institutions, and a rise in political violence that would be unprecedented for most living Americans. Looking back from the present, Turchin’s forecast wasn’t a lucky guess—it was the result of a rigorous, quantitative approach to history.
Turchin’s work falls under a discipline called cliodynamics. This field treats history not as a series of random accidents, but as a system with recurring pressures. When wages stall while costs rise, and when too many ambitious individuals compete for too few elite positions, the risk of societal disorder increases. While cliodynamics can’t predict the specific “spark” that starts a fire, it can accurately predict when the environment is dry enough for a spark to catch.
The WEIRD Problem in Modern Psychology
While cliodynamics focused on structural pressures, the field of psychology spent most of its history ignoring the impact of time and culture. For decades, psychologists studied the human mind as if it were a static organ, regardless of where or when a person lived. Most research relied on participants from Western, Educated, Industrialized, Rich, and Democratic (WEIRD) societies.
As noted by Henrich, Heine, and Norenzayan (2010), this created a significant blind spot. By treating a narrow, privileged sample of humanity as a proxy for the entire species, the field built a “universal” science based on one of the strangest samples available. To truly understand the human mind, researchers realized they needed tools to study minds that no longer exist.
The Rise of Historical Psychology
The emergence of historical psychology is filling this gap. By leveraging computational tools, researchers can now analyze the psychological state of past populations at scale. This isn’t limited to reading a few diaries; it involves massive data processing:
- Word Vectors: Training AI on centuries of newspapers to see how the meaning of words like “honor” or “woman” shifted over time.
- Custom Dictionaries: Tracking the rise and fall of specific psychological vocabularies across decades.
- Supervised Classifiers: Using human coders and AI to analyze millions of pages of court records, sermons, and diaries.
According to Muthukrishna and colleagues (2020), these tools allow for a level of precision that was previously impossible. For example, Schulz and colleagues (2019) found that regions of Europe once heavily reorganized by the medieval Catholic Church—specifically through bans on cousin marriage—now show the highest levels of individualism and impersonal trust. This suggests that the “modern” mind is actually an artifact of a thousand-year reorganization of family structures.
The Chronospatial Turn: Merging Structure and Mind
Cliodynamics tells us that a society is under strain, but it doesn’t explain how that strain feels or acts inside a person’s head. This is where the “chronospatial turn” comes in. Proposed by Atari and colleagues (2025), this joint project combines data with time stamps and geographic coordinates to model how structural pressures translate into psychological shifts.
This synthesis helps answer critical questions about societal collapse and resilience:
- Simplification: Why do minds under sustained uncertainty begin to prefer simple stories over complex realities?
- Authoritarianism: Why do authoritarian voices start to sound reassuring during times of crisis?
- Conspiracy Thinking: Why does conspiracy thinking stop seeming eccentric and start becoming mainstream (Biddlestone et al., 2025)?
Key Takeaways: Understanding Societal Pressure
- Cliodynamics views history as a system of recurring pressures (e.g., economic stagnation, elite competition) rather than random events.
- The WEIRD Problem highlights how traditional psychology relied too heavily on Western, Educated, Industrialized, Rich, and Democratic samples.
- Historical Psychology uses computational linguistics and word vectors to quantify the psychological states of people from the past.
- The Chronospatial Turn integrates geographic and temporal data to understand how structural societal strain changes human psychology.
Why This Matters Today
The ability to quantify how a society’s psychology bends under pressure is more than an academic exercise. It provides a roadmap for intervention. By identifying the patterns that led to the fall of Late-Republican Rome or the Bourbon endgame in France, policymakers and leaders can evaluate which reforms actually relieve societal strain and which merely postpone the inevitable.
reading the dead is one of the most effective ways to forecast the living. When we understand the arithmetic of the past, we can recognize the patterns of the present before the spark catches.