In 1978, Pauline Clance and Suzanne Imes published a paper documenting a phenomenon they had observed across a clinical population of highly successful women: a persistent private belief that their achievements were not genuinely deserved, that they had somehow fooled the people around them into overestimating their capability, and that exposure as fraudulent was a constant latent threat. The paper named this the impostor phenomenon. Subsequent research found it was neither specific to women nor to any particular achievement domain. Clance’s later prevalence work documented that approximately 70% of high-achieving people report impostor experiences at some point in their careers.

The finding creates an immediate problem for the impostor’s self-narrative. The belief that sustains the impostor experience is that one is uniquely fraudulent while the people around one genuinely deserve their success. The prevalence data establishes that this belief is itself a cognitive distortion: the most common private experience among high achievers is the one the impostor believes makes them different from high achievers.

What the impostor experience actually is

The impostor experience is not low self-esteem, and the distinction matters for how it is addressed. Low self-esteem is a global negative evaluation of the self. The impostor experience is a more specific belief: that the self being presented in professional contexts is a performance rather than an accurate expression of genuine capability. The person with the impostor experience can have considerable self-esteem in other domains — as a parent, a friend, a person with values they respect — while maintaining the private belief that their professional competence is a fraud being successfully perpetrated.

This structural specificity explains why the impostor experience is so resistant to the obvious resolution. If the belief were about low self-esteem generally, evidence of achievement in the professional domain would be directly disconfirming. The impostor experience incorporates the achievement into its narrative: each success is evidence not that the belief is wrong but that the fraud is being successfully maintained. The success confirms the performance, not the capability.

The escalation paradox

Mirjam Neureiter and Eva Traut-Mattausch’s research documented the finding that most directly challenges the intuition that success should resolve the impostor experience. Impostor experience intensifies with achievement rather than diminishing. Each new achievement raises the performance standard that must be maintained going forward and simultaneously raises the stakes of eventual exposure, without updating the underlying self-assessment that the performance is undeserved. The gap between external achievement and internal self-assessment grows with success.

The mechanism is the one the impostor narrative predicts: each success is attributed to factors outside the self, whether luck, timing, the failure of others to see clearly, or the effectiveness of the performance. The attribution prevents the success from serving as evidence for genuine capability, so the self-assessment remains stable while the public profile of achievement continues to grow. The more successful the impostor becomes, the more elaborate and precarious the fraud narrative has to be to account for the accumulating evidence to the contrary.

The self-verification maintenance loop

William Swann’s self-verification research predicts the specific mechanism through which the impostor experience sustains itself. People with negative self-assessments in a domain preferentially seek feedback that confirms those assessments over feedback that challenges them, even when the confirming feedback is negative. The self-verification motivation operates in favour of the impostor belief: the impostor preferentially attends to evidence of insufficiency, remembers failures more vividly than successes, and interprets ambiguous feedback as confirming the fraud. The rare genuinely critical feedback is processed as the first honest signal; the consistent positive feedback is processed as evidence that the performance is working.

This is not irrationality in the conventional sense. Self-verification is a motivated process that serves psychological coherence — it maintains the predictability of the self-concept and of the social environment. For the impostor, coherence is maintained by the insufficiency belief, and the environment is searched for evidence that confirms it. The search is not conscious; it operates through the same selective attention and memory processes that maintain any self-schema.

The Dunning-Kruger inversion

Justin Kruger and David Dunning’s research on metacognitive accuracy and competence provides the most clarifying context for the impostor experience by establishing its structural opposite. Genuine incompetents systematically overestimate their ability because they lack the metacognitive capacity to recognise what they do not know. High-competence impostors systematically underestimate their ability because they assume that what comes easily to them comes easily to everyone — that their performance standard is the baseline rather than the outlier. The Dunning-Kruger person does not know what they do not know; the impostor does not know what they do know.

The impostor’s characteristic misestimation is normalising their own competence: assuming that the skill, insight, or capability that produces their performance is something anyone with reasonable effort could produce. The evidence that others in comparable positions are not producing comparable performance is available, but the self-verification process prevents it from being registered as evidence that the competence is genuine rather than performed.

The contingent self-worth amplifier

Jennifer Crocker and Lora Park’s contingent self-worth research predicts which individuals will experience the impostor phenomenon most intensely. The person whose self-worth is heavily contingent on professional performance — who needs to be seen as competent and capable to feel adequate — has more at stake in the impostor belief than the person with non-contingent self-worth. For the highly contingent person, the potential exposure that the impostor narrative threatens is not merely embarrassing; it is identity-annihilating. The intensity of the impostor experience is a function of the self-worth contingency as much as of the actual self-assessment.

For the entrepreneur, this compounds directly: entrepreneurial culture tends to evaluate worth through commercial performance, creating precisely the contingency conditions under which impostor experience is most intensely maintained and most resistant to the evidence of achievement.

What actually reduces it

Research on impostor experience interventions consistently identifies the most effective mechanism as disclosure: naming the impostor belief and sharing it with others who confirm their own experience of it. The mechanism is the Festinger social comparison finding operating in reverse. Learning that the people whose competence one has been using as the standard against which one’s own fraudulence is measured share the same private experience directly challenges the belief’s central claim. The impostor belief requires that the others are genuinely what they appear; the disclosure reveals that they are managing the same gap between appearance and private experience.

The disclosure does not eliminate the impostor experience. The research suggests it reduces the distress it generates and the avoidance behaviour it produces. The person who has named their impostor belief and knows it is common among high performers is less governed by it than the person who is maintaining it in private as evidence of their unique fraudulence, which is to say as evidence of something worth concealing.

If the dynamics described here are significantly affecting your wellbeing, speaking with a psychologist is the right next step. UK: Samaritans (116 123, free, 24/7). Mind (0300 123 3393). BACP: bacp.co.uk/search/Therapists. Crisis Text Line — text HOME to 741741 (US, UK, Canada, Ireland). International: internationaltherapistdirectory.com.

This article is for educational and informational purposes only. Sources: Clance, P.R. & Imes, S.A. (1978), The Impostor Phenomenon in High Achieving Women, Psychotherapy: Theory, Research and Practice, 15(3), 241-247. Neureiter, M. & Traut-Mattausch, E. (2016), An Inner Barrier to Career Development: Preconditions of the Impostor Phenomenon and Consequences for Career Development, Frontiers in Psychology, 7, 48. Swann, W.B. (1987), Identity Negotiation: Where Two Roads Meet, Journal of Personality and Social Psychology, 53(6), 1038-1051. Kruger, J. & Dunning, D. (1999), Unskilled and Unaware of It, Journal of Personality and Social Psychology, 77(6), 1121-1134. Crocker, J. & Park, L.E. (2004), The Costly Pursuit of Self-Esteem, Psychological Bulletin, 130(3), 392-414. Festinger, L. (1954), A Theory of Social Comparison Processes, Human Relations, 7(2), 117-140. Young, V. (2011), The Secret Thoughts of Successful Women, Crown Business. Kay, K. & Shipman, C. (2014), The Confidence Code, Harper Business.