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The Shape of Love: Sternberg's Triangular Theory and What It Predicts
Advanced Social Psychology · Chapter 8: Friendship, Love, and Close RelationshipsSection 8.3 · lesson 49 of 8510 min · free with a free account
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In this lesson
Three components, 8 love types, and why the ideal one is hard to hold.
- Describe the 3 components of the triangular theory
- Identify the 8 love types the components generate
- Explain habituation of passion and triangle matching
- Evaluate the theory's empirical support and limits
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Friendship, Love, and Close Relationships
The Shape of Love
Asking how much two people love each other is the wrong question. Or rather, it is a question with only one dimension. Sternberg's contribution was to give love three. Intimacy, passion, and commitment. Each present or absent, which yields eight distinct kinds of love. And each running on its own clock, which is the useful part. One of them reliably fades, and two of them do not. That single asymmetry explains most of what happens to long relationships. We will also cover why fit matters more than amount. And where the theory has been criticized, which is worth knowing.
The Model
Love as a Triangle
Robert Sternberg published the triangular theory in nineteen eighty-six. Love, he proposed, is a triangle whose three vertices are three components. Intimacy is emotional closeness, warmth, and connectedness. Passion is motivational arousal, physical attraction, romantic excitement. Commitment is two things bundled together. The decision that one loves another. And the commitment to maintain that love over time. Now the geometry does real work, so take it seriously. The area of the triangle represents the overall magnitude of love. Its shape represents the balance between the components. Two relationships can hold the same amount of love in very different shapes.
Three Vertices
Distinguishable, and Independent
The three components are theoretically distinguishable. And, importantly, empirically distinguishable too. That independence is what allows the model to generate types. Rather than simply producing a single score. If the three always moved together, the triangle would collapse to a line. You would be back to asking how much, and nothing else. Because they can vary separately, the shape carries information. A wide flat triangle is a different relationship from a tall narrow one. Even when the two enclose exactly the same area. Hold that image, because the next slide sets the three vertices moving.
Different Clocks
Each Component Has Its Own Trajectory
The three components develop at different rates within relationships. And they respond differently to time and circumstance. That is the model's most testable claim, so look at it closely. Intimacy grows gradually, accumulating through self-disclosure and shared experience. Passion peaks early, and then typically habituates over time. Sternberg refers to this as the excitation transfer decline. It is the steepest curve of the three, by a wide margin. Commitment grows slowly, slower than either of the others. But it can become the most stable component in long-term relationships. Last to arrive, and last to leave. Three clocks predict that a relationship's shape changes even when its size does not.
The 8 Types
Four Types With One Component or None
The presence or absence of each component generates eight love types. Take the first four, which have at most one component present. Non-love has none of the three. A casual acquaintance is the example. Liking has intimacy alone, with no passion and no commitment. That is a close platonic friend. Infatuated love has passion alone. A crush at first sight, with no knowledge and no decision behind it. Empty love has commitment alone, and it is the instructive one. The example is a stagnant long marriage. Commitment with neither intimacy nor passion is still a love type here. The relationship persists on the decision alone.
The 8 Types
Four Types With Two Components or Three
Now the four types with two components, or all three. Romantic love is intimacy plus passion, without commitment. A summer romance is the example, and the label fits. Companionate love is intimacy plus commitment, without passion. Long-married partners are the standard case. Fatuous love is passion plus commitment, without intimacy. A whirlwind engagement, and the name is not flattering. That type names a real failure mode, so pause on it. It can score high on love's magnitude while missing one component. The one component that requires time to build. And consummate love has all three, the ideal balanced case. The model turns one question into eight answers, several of which look alike outside.
Consummate Love
Hard to Reach, Harder to Hold
Consummate love is what most people aspire to in a romantic relationship. Sternberg emphasized that achieving it is difficult. And that maintaining it over time is even more challenging. The reason is mechanical, not a matter of effort or virtue. Passion habituates through what is called the opponent process. Solomon and Corbit described it in nineteen seventy-four. Repeated exposure to a pleasurable stimulus does two things. It produces an increasingly muted positive response. And an increasingly potent opponent state, upon withdrawal. So passion-based arousal typically declines within two to three years. The withdrawal half is the cruel part of that mechanism. The absence grows more painful as the presence grows less pleasurable.
The Practical Move
Reinvesting in Intimacy
So what do couples who stay satisfied actually do? They make a transition, rather than trying to hold the line. Away from passion-dominated early love. Toward intimacy-anchored and commitment-anchored companionate love. Which is to say, toward the two components that do not habituate. The couples reporting highest long-term satisfaction are typically those. But passion is not entirely a lost cause, either. Arthur and Elaine Aron's self-expansion research points at a partial recovery. Joint participation in novel, challenging activities can re-activate arousal. Passion-related arousal, in long-term relationships. And notice why novelty specifically, rather than pleasure. The expanding self is the mechanism. New territory is what generates the arousal.
Triangle Matching
Fit, Not Just Magnitude
Sternberg extended the model to address satisfaction directly. Through a concept he called triangle matching. Satisfaction is predicted by congruence, and it is measured in two places. First, a partner's actual triangle against their own ideal triangle. The ideal being how much intimacy, passion, and commitment they think they should have. Second, the two partners' triangles against each other. Significant discrepancies predict dissatisfaction, and conflict. The common case: one partner values passion highly, the other prioritizes commitment. Neither triangle is wrong, which is what makes it hard to argue about. The dissatisfaction is produced by the mismatch itself. Which is why debating who loves correctly never resolves it.
The Evidence For Matching
Independent of Absolute Level
Sternberg and Barnes tested the matching idea in nineteen eighty-eight. They found support for triangle matching as a predictor of satisfaction. And crucially, independent of the absolute levels of the components. Partners whose ideal triangles matched each other's actual triangles did best. They reported the greatest satisfaction. Now, why does that word independent carry so much weight? Suppose matching only predicted satisfaction for a boring reason. Because matched couples simply love each other more overall. Then the finding would collapse back into magnitude. Independence of absolute level is what makes fit a genuinely separate variable. So it is not just how much love there is. It is the balance, and the fit between two people's shapes.
The Support
Three Lines of Evidence
The theory has support from three methodologically different directions. That pattern is what makes a framework durable, rather than fashionable. First, factor-analytic studies confirming the three-component structure. Sternberg reported that in nineteen ninety-seven: the components separate in the data. Second, cross-cultural replications. Lemieux and Hale, in two thousand two. The structure appears outside the population it was built on. Third, longitudinal research on the differential trajectories. The predicted separate curves for intimacy, passion, and commitment. That third line is the strongest of the three. Factor structure could be an artifact of how questions are worded. Different curves over time, predicted in advance, is much harder to get by accident.
Consolidate
What the Theory Does Not Do
Two criticisms merit consideration, and both are about omissions. The first is that the theory is descriptive rather than explanatory. It identifies the dimensions of love. Without specifying the psychological mechanisms that drive change in each. It tells you what moves, and not why it moves. The second criticism concerns cultural universality. Research suggests passion and commitment may be weighted differently. Across individualist and collectivist cultural contexts. Which fits the earlier rule exactly. The components may travel; the weights may not. Carry four things out of this section. Three components on three clocks, and eight types from their combinations. Passion habituates while intimacy and commitment do not. And satisfaction depends on fit as much as on magnitude.
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