The failure stories that get told are usually about running out of money, or missing the market, or hiring the wrong people. What gets discussed less is the pattern where the failure begins not at the worst moment but at the best one. The funding round that closed. The product launch that landed. The press moment that validated everything. The win that, in hindsight, was where things started to go wrong. This is not a paradox that requires a complicated explanation. There are specific neurobiological, psychological, and strategic mechanisms that make the post-win period genuinely dangerous — and they operate invisibly, beneath conscious awareness, precisely when external signals are at their most positive.

What Winning Does to the Brain

Ian Robertson, a neuroscientist at Trinity College Dublin, documented what he calls the winner effect — the measurable neurochemical changes that follow a significant win. When someone achieves a meaningful victory, testosterone and dopamine levels rise. The dopamine increase drives approach motivation, goal-focus, and confidence. The testosterone increase amplifies risk tolerance and competitive drive. Both feel, from the inside, like clarity and momentum.

The dangerous dimension is that this neurochemical state is not calibrated to context. It persists after the win and colors the decisions that follow. Robertson’s research, and the animal and human studies he synthesizes, shows consistently that the brain in a post-win state is focused on goals rather than threats — which is the optimal state for pursuing an opportunity, but the wrong state for the careful, threat-sensitive evaluation that the next phase of a business requires.

John Coates and Joe Herbert’s research on a London trading floor, published in PNAS in 2008, measured testosterone levels in traders across sessions and found that higher morning testosterone predicted greater risk-taking and better performance that afternoon — but that the same hormonal state, sustained across a run of wins, predicted increasingly poor risk calibration. The biological mechanism that drove early gains became the mechanism that produced eventual losses. The same cycle applies to entrepreneurs making hiring, spending, and strategic decisions in the weeks following a major win.

The dopamine system compounds this: dopamine is released in anticipation of reward and during goal pursuit. Power and success are among the strongest drivers of the dopamine reward system. The self-reinforcing cycle this creates — win, neurochemical elevation, increased risk-taking, further wins — eventually overshoots the optimal range. The very state that feels like peak performance is often the state in which the most consequential errors are made.

The brain that earned the win is not the brain that should be making the next 60 days of decisions. But it is, because nobody tells you to adjust for it.

The Acquired Personality Change

Owen and Davidson’s 2009 paper in Brain described what they called hubris syndrome — a pattern of cognitive and personality change that emerges following substantial success or power, distinct from any pre-existing personality disorder because it is acquired rather than lifelong.

The characteristics they documented in their analysis of US presidents and UK prime ministers over a century include:

  • A tendency to see the world primarily as an arena for self-expression,
  • Disproportionate concern with image and legacy,
  • A pattern of identifying the self with the organization to the point where the boundaries dissolve,
  • Contempt for the views of others, and
  • A reduced capacity to engage with the feedback that would correct errors.

This is not a clinical diagnosis and should not be presented as one. It is a well-described psychological pattern with a specific and consistent trigger: the accumulation of success and the social environment that follows it. The mechanism that makes it most dangerous for entrepreneurs is what it does to the information environment. Team members who challenged the entrepreneur before the win are less likely to challenge someone who has just been publicly validated. Advisors who offered honest friction are replaced, consciously or not, by people who affirm. The founder feels more certain than ever about their judgment at exactly the moment when the circuit of honest feedback that would correct overconfidence has been degraded.

MIT Sloan Management Review’s analysis of this pattern identified a specific amplifier: the higher an entrepreneur climbs, the fewer peers they have — which means fewer people are monitoring their thinking, decisions, and strategies. The feedback deprivation accelerates at the same rate as the success. The result is a founder who is simultaneously more confident and less well-informed than at any previous point.

How the Win Hardens into a Trap

Danny Miller’s Icarus Paradox — described in his 1992 paper in Business Horizons and developed in his book of the same name — provides the strategic dimension. His central finding was that successful companies tend to fail not despite their strengths but because of them. The strategies, products, and management approaches that produced the win become overextended and rigidly applied to contexts where they no longer work. Success generates commitment to the methods that produced it, and that commitment becomes the constraint that prevents adaptation.

The cognitive mechanism underlying this is self-serving attribution. Studies of letters to shareholders in corporate annual reports found that executives consistently attributed favorable outcomes to factors under their control — strategy, product decisions, management approach — while attributing unfavorable outcomes to external factors like market conditions or macroeconomic shifts. The entrepreneur who closed a funding round on a particular narrative begins to over-index on that narrative. The product that succeeded through a specific distribution insight gets treated as a universal template. The strategic insight is real. The attribution of its universality is the distortion.

Jim Collins’ research on organizational decline, based on matched-pair analysis of companies that fell from great performance to failure, found that hubris born of success was Stage 1 in the decline sequence in every case he studied. It preceded and directly caused the undisciplined pursuit of more — more scale, more markets, more growth — before the capability to support that growth existed. The overreach was not recklessness in the ordinary sense. It was the logical extension of a success attribution process that had stripped luck and circumstance from the account of how the win happened.

The Data is Less Flattering than the Culture

The self-serving attribution asymmetry documented in annual report studies is not a finding about weak leaders or poor thinkers. It appears consistently across high-performing executives who have demonstrably succeeded. The bias does not correlate with intelligence or track record. It correlates with success itself — the more someone has won, the more they attribute those wins internally and the losses externally, and the more their risk calibration drifts.

Robertson’s synthesis of the winner effect research is specific: the biological changes from winning are measurable and reliable, and they reliably overshoot the optimal range when wins accumulate quickly. The trading floor data is the cleanest evidence for this, but the mechanism is not specific to financial markets. It is a general feature of how the brain responds to success in competitive, high-stakes environments.

Collins’ five-stage decline research found that the move from hubris born of success to undisciplined pursuit of more was the most consistently observed pattern in companies that had been genuinely exceptional before their decline. The companies that avoided decline were distinguished not by avoiding success but by maintaining the disciplines and feedback structures that kept success from becoming the precursor to overreach.

If the patterns described here map onto a specific recent period in your business — a major win followed by decisions that felt obvious at the time and look different in retrospect — that is worth examining more carefully than the culture typically encourages. A business psychologist or advisor with experience in this territory can look at the specific situation in ways that general research cannot.

Working with the Vulnerability

The most direct structural response to the winner effect is building in a deliberate pause before committing to major decisions in the weeks following a significant win. Not because the instincts in that period are always wrong, but because the neurochemical state that produces them is systematically biased toward approach motivation and goal-focus at the expense of threat sensitivity. Decisions that can wait should wait. Decisions that cannot wait should be made with the specific awareness that risk calibration is currently running hot.

The hubris syndrome’s feedback deprivation problem requires a structural response as well. The natural social environment after a significant win moves toward affirmation. Countering this requires deliberately maintaining or building relationships with people whose function is honest friction — advisors, peers, or professionals whose credibility is not dependent on the entrepreneur’s continued success and who have no social incentive to tell them what they want to hear.

The Icarus Paradox suggests that the most important question after a win is not “how do we do more of what worked?” but “what conditions made this work, and are those conditions still present?” Separating the repeatable strategic insight from the contextual factors — including luck — that amplified it requires the kind of honest attribution that the self-serving bias makes difficult without deliberate effort.

The anterior cingulate cortex, the brain’s error detection system, functions best when it has accurate information about both successes and failures. The self-serving attribution bias degrades its inputs on the success side. Deliberately feeding it more accurate information — through systematic post-mortems that do not distinguish between wins and losses, but examine both with equal scrutiny — is the cognitive practice that most directly counters the mechanism.

A Book Worth Reading Alongside This

How the Mighty Fall by Jim Collins is the most rigorous and directly applicable starting point for any entrepreneur who wants to understand how success becomes the precursor to decline. Collins’ research methodology — matched-pair analysis comparing companies that fell from exceptional performance against those that did not — produces findings that are specific and replicable rather than anecdotal. His identification of hubris born of success as the universal first stage of decline is not a philosophical observation. It is an empirical finding from systematic comparative research, and it is worth understanding in full.

This article discusses psychological and neurobiological patterns documented in research on success, overconfidence, and organizational decline. It is not designed to identify, diagnose, or assess any psychological condition, and it is not a substitute for professional support. The patterns described here are well-documented features of human cognition and organizational behavior — recognizing yourself in them is not a cause for alarm. If, however, these patterns are significantly affecting your decision-making, relationships, or well-being, speaking with a psychologist or business advisor can provide personalized guidance that an article cannot.

This article is for educational and informational purposes only. It is not a substitute for professional psychological advice, diagnosis, or treatment. If you are experiencing significant psychological distress, please consult a qualified mental health professional.