Field Theory
Kurt Lewin's psychological theory that behavior results from the totality of forces acting on a person within their psychological environment, or life space, at a given moment.
Also known as: Lewin's Field Theory, Lewinian Field Theory, Psychological Field Theory, Life Space
Category: Psychology & Mental Models
Tags: psychology, motivations, behaviors, systems-thinking, mental-models
Explanation
Field Theory is the framework Kurt Lewin developed in the 1930s and 1940s to explain human behavior as the product of a dynamic field of interacting forces rather than of isolated traits or past causes. Borrowing the idea of a field from physics, Lewin argued that behavior can only be understood by looking at everything that is psychologically present for a person at a given moment.
## Core Ideas
- **Life space**: The total psychological environment of a person as they experience it: their needs, goals, beliefs, perceived obstacles, other people, and the situation itself. What matters is the world as perceived, not the objective world.
- **Forces and valences**: Goals and objects in the life space carry positive or negative valence (attractiveness or repulsiveness). These valences generate forces that push or pull the person toward or away from regions of the field.
- **Tension systems**: Intentions and needs create internal tension that persists until the corresponding goal is reached. Lewin called intention-induced tensions quasi-needs.
- **Contemporaneity**: Only forces present now determine behavior now. The past matters only through its traces in the current field.
- **Barriers**: Obstacles in the life space block paths to goals, redirecting forces and producing frustration, detours, or substitute activities.
## Experimental Legacy
Field Theory generated some of the most famous experiments in psychology, run by Lewin's students in Berlin: Bluma Zeigarnik's work on memory for unfinished tasks (the Zeigarnik Effect), Maria Ovsiankina's work on spontaneous resumption of interrupted tasks (the Ovsiankina Effect), and studies on substitute satisfaction, level of aspiration, and psychological satiation. All of them test the prediction that an unfulfilled intention keeps a tension system active.
## Applications
Lewin later applied the same thinking to groups and organizations, which led to force field analysis, his three-stage model of change (unfreeze, change, refreeze), action research, and the field of group dynamics. The famous formula B = f(P, E), known as Lewin's Equation, summarizes the theory.
## Why It Matters
- It shifts attention from 'what kind of person is this?' to 'what forces are acting on this person right now?', which is usually more actionable.
- For productivity, it explains why unfinished commitments weigh on you: each one is an active tension in your field.
- For change, it suggests that reducing restraining forces often works better than adding more pressure.
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