Illusion of Asymmetric Insight: Why You Think You Know Them Better

The illusion rests on a difference in what each person has to go on. You know yourself from the inside: a running stream of thoughts, intentions and feelings that nobody else can see. You know your friend from the outside: what they say, what they do, how they look when they say it. Pronin, Kruger, Savitsky and Ross proposed that people treat these two kinds of evidence unevenly. Observable behavior is taken to be revealing about other people and not very revealing about oneself, while private thoughts and feelings are taken to be the real self when they are one's own and treated as beside the point when they are someone else's.

Put those two convictions together and the asymmetry follows. Your friend's behavior, which you can see, is read as a window onto their nature, so you feel you know them well. Your own behavior, which they can see, is read as a poor guide to the inner life you know is there, so you feel they cannot know you nearly as well. The 2001 paper tested this directly by asking people how much of a friend's essential nature shows in observable behavior and how much of their own does; the share was higher for the friend. The paper's title captures the stance: you don't know me, but I know you.

The same logic produced a second asymmetry. College roommates in Study 2 believed they knew themselves better than their roommates knew themselves, which is the claim that your self-insight exceeds other people's self-insight. And in Study 6 the pattern scaled up: members of groups believed their group understood a relevant out-group better than that out-group understood them. Each side of a political or professional divide can hold this belief at once, which is one reason such divides are hard to talk across.

How accurate the belief is depends on what is being known. Vazire's 2010 study of 165 people rated by themselves, by four friends and by strangers found that the self was the best judge of traits that are hard to observe, such as anxiety, while friends were the better judges of traits that are visible and carry evaluation, such as intellect. The self does have privileged information, but not about everything, and the illusion is the assumption that the privilege runs one way across the board.

Emily Pronin, Justin Kruger, Kenneth Savitsky and Lee Ross published "You don't know me, but I know you: The illusion of asymmetric insight" in the Journal of Personality and Social Psychology in 2001. The paper reports six studies built around one hypothesis: that people perceive their knowledge of their peers to surpass their peers' knowledge of them.

Study 1 asked people about a close friend. Participants rated how well they knew and understood the friend and how well the friend knew and understood them, and the first rating was higher than the second. A second set of questions, built on the image of an iceberg, asked how much of the friend's essential nature was visible in what the friend said and did, and how much of their own nature was visible in the same way; people saw more of the friend above the waterline than of themselves. Study 2 moved to college roommates and added the intrapersonal version: roommates reported knowing themselves better than their roommates knew themselves.

Later studies looked for the source of the asymmetry in the weight given to observable behavior. In one, participants completed word fragments and then judged what the completions revealed. Their own completions were dismissed as revealing little about them, while the same kind of completions by another person were read as diagnostic of that person's character. The paper also tested interpersonal revelations, personal disclosures of the kind friends make, with the same result: revealing about others, not about the self. Study 6 extended the pattern from individuals to groups, finding that group members believed their group knew and understood a relevant out-group better than the reverse.

The authors placed the illusion within the broader account of naive realism they had been developing, the sense that one sees the world as it is. If my view of myself is simply accurate, then anyone whose view of me differs must be missing information, and if my reading of you is simply what your behavior shows, then I have you right. The page's demo asks the two Study 1 questions and the two iceberg questions in plain form; it does not reproduce the paper's scales or procedure.

The pattern turns up wherever two people, or two sides, each feel they have the other figured out.

The illusion is hard to remove from the inside, because it is made of the inside. These habits work against it.

• Notice when you discount your own behavior. If you catch yourself saying that something you did does not reflect who you are, ask whether you would accept the same defense from someone else.
• Ask the other person what they see. Friends and colleagues have information about your visible self that you cannot get any other way, and Vazire's work suggests they are the better judges of some traits.
• Grant the other person an inside. The thoughts and intentions you use to explain yourself exist in them too; their behavior is as partial a window onto them as yours is onto you.
• In a disagreement, state the other side's position until they agree you have it. Being sure you understand them is the feeling the illusion produces, not evidence that you do.
• Be suspicious of the claim, in yourself or in a group, that the other side cannot understand you. It is almost always held in both directions at once.

Several findings describe the gap between how people see themselves and how they see others. This one is specifically about who knows whom.

• It is not the bias blind spot, which is seeing bias in other people's judgments more readily than in your own. That is a claim about distortion; this is a claim about knowledge. The two share a root in naive realism and often appear together.
• It is not the illusion of transparency, the overestimate of how far other people can read your inner states. That illusion assumes others see too much of you; this one assumes they see too little, while you see plenty of them. People manage to hold both, about different things.
• It is not naive realism itself, the broader assumption that you see the world as it is. The asymmetric insight illusion is one of its products, applied to what people know about each other.