Originally published in April 2023 and comprehensively updated/edited in June 2026
How adrenaline, dopamine, and cortisol shaped the psychology of the startup era — and what the science of stress reveals about businesses built on urgency.
In the spring of 2021, a 29-year-old engineer at a mid-sized fintech startup described her mornings to a friend this way: she would wake up to Slack notifications before her alarm went off, answer a few while still in bed, arrive at the office to find her manager already deep in a call with investors, and spend the next ten hours moving between tasks that were each, somehow, the most urgent thing happening at the company. She wasn’t in danger. Nothing in her environment posed a genuine threat. But her body behaved as though something was always about to go wrong — heart rate slightly elevated, sleep never quite restorative, weekends spent half-present and half-reviewing the week’s metrics in her head. She didn’t have a word for it at the time. Later, she would.
Her experience wasn’t unusual. Across a certain stratum of the economy — venture-backed startups, growth-stage technology companies, the investment firms and consulting shops that orbited them — a particular psychological atmosphere had taken hold. It was electric and exhausting in equal measure. The companies operating in this atmosphere weren’t just businesses; they were environments engineered to sustain a state of controlled urgency. The adrenaline was the product, in a sense — it kept people moving faster than they might have if they’d stopped to think.
The phrase “businesses built on adrenaline” captures something specific: companies constructed not just on capital or innovation, but on a sustained psychological state of excitement, urgency, and fear of missing out. These were ventures that recruited talent by promising historic missions, attracted investors by framing hesitation as a failure of vision, and retained workers through mechanisms that made leaving feel psychologically costly. This article traces how that atmosphere developed, what biological and psychological forces sustained it, and why it eventually ran into the limits that human physiology and economic reality impose on all things that move too fast for too long.
The Era of Permanent Disruption
To understand why so many businesses were built on adrenaline, you need to understand the cultural moment that made it possible. Starting roughly in the early 2010s and accelerating through the mid-2020s, a particular ideology became dominant in technology and investment circles. Its core belief was simple: the world was being remade by technology, the pace of change was accelerating, and anyone who moved slowly would be left behind. Disruption wasn’t just a strategy — it was a moral imperative.
This worldview had real evidence behind it. Smartphones had remade retail, communication, and media within less than a decade. Social platforms had altered how people formed opinions and organized politically. Cloud computing had lowered the barrier to starting a software company to almost nothing. These were genuine transformations, and it was reasonable to conclude that more were coming.
But somewhere along the way, the observation that change was happening fast became a belief that speed was the primary virtue of business. “Move fast and break things” wasn’t just a catchphrase — it was a philosophy that filtered into hiring decisions, product timelines, fundraising pitches, and corporate culture. The companies that won big seemed to be the ones that had taken audacious risks and moved before the market was ready. The lesson many drew was that restraint was for losers.
Cheap money amplified all of this. The period from roughly 2010 to 2022 featured historically low interest rates in most major economies, which meant capital was looking for returns it couldn’t find in traditional instruments. Venture capital funds swelled. Late-stage private equity poured money into startups still burning cash. The phrase “blitzscaling” — popularized by LinkedIn co-founder Reid Hoffman — described a deliberate strategy of growing at potentially reckless speed, on the theory that capturing market share quickly was worth more than operating sustainably. When there’s enough money in the ecosystem, even recklessness can look like genius for a long time.
What Adrenaline Actually Does
The word “adrenaline” is being used partly as a metaphor here, but it’s also a literal description of what was happening inside the bodies of the people building these companies. Understanding the neuroscience helps explain why this era felt the way it did — and why it was so difficult to sustain.
Adrenaline — technically called epinephrine — is a hormone released by the adrenal glands in response to perceived stress or excitement. It prepares the body for rapid action: increasing heart rate, sharpening focus, elevating blood sugar for quick energy, and suppressing systems the body considers non-essential in a crisis, like digestion and immune response. The closely related neurotransmitter norepinephrine plays a similar role in the brain, heightening alertness and preparing for fight-or-flight. Together, these chemicals produce the sensation people describe as an adrenaline rush: heightened awareness, urgency, a sense that every decision matters.
Crucially, this system evolved for short-term emergencies. Running from a predator. Responding to sudden danger. The stress response is spectacularly effective for that purpose. But it was never designed to run continuously for weeks, months, or years — which is precisely what startup culture asked it to do.
Alongside adrenaline, chronic stress triggers the sustained release of cortisol, sometimes called the “stress hormone.” Cortisol serves important functions in short doses — it helps regulate inflammation, maintain blood pressure, and mobilize energy. But elevated cortisol over long periods is associated with a cascade of negative effects: impaired memory and cognitive function, suppressed immune response, disrupted sleep, increased anxiety, and in some cases, structural changes to the brain’s hippocampus, which is involved in memory and emotional regulation.
Research by psychologists including Robert Sapolsky at Stanford has documented how chronic stress affects judgment and decision-making in ways that are largely invisible to the person experiencing them. When people are under sustained pressure, they tend toward shorter time horizons — they focus on immediate problems and discount longer-term consequences. They become more risk-tolerant in some domains (taking bigger bets) and more risk-averse in others (avoiding uncomfortable conversations). And they lose some of their ability to accurately assess their own performance, a phenomenon sometimes called “stress myopia.” These effects describe, in fairly precise neurological terms, the culture that many high-growth startups cultivated: shipping features before they’re ready, taking enormous financial bets while avoiding hard internal conversations, and leaders convinced they were winning when they were losing.
Dopamine and the Feedback Loops of Growth
If adrenaline and cortisol explain the stress side of startup culture, dopamine explains the intoxication. Dopamine is a neurotransmitter deeply involved in the brain’s reward system — but not quite in the way popular culture usually describes it. Dopamine doesn’t produce pleasure so much as it drives the anticipation of reward and the motivation to pursue it. It’s what makes you want things, more than it’s what makes you feel satisfied by them.
Neuroscientists have identified something striking about this system: dopamine neurons often fire more intensely in the period of anticipation than at the moment the reward actually arrives. When the reward is delivered, activity briefly spikes and then drops off — sometimes falling below baseline, producing a subtle deflation right at the moment of apparent victory. This is why hitting a target so often feels anticlimactic. The brain was never really chasing the goal; it was chasing the approach to the goal. And as soon as the goal is reached, a new one must appear to sustain the same neural engagement.
This maps almost perfectly onto growth-stage company culture. The metrics startups obsess over — user counts, revenue run rates, monthly active users, valuation multiples — create a dopaminergic treadmill. Hitting a growth target produces a brief hit of reward, but the anticipation immediately shifts to the next milestone. The target is always just ahead. And because dopamine is most strongly triggered by variable, unpredictable rewards — a finding that goes back to B.F. Skinner’s work on reinforcement schedules — the inherent uncertainty of startup metrics made them even more compelling.
Fundraising rounds operated on the same logic. Each new round — Seed, Series A, B, C — was framed as a validation, a signal that serious people believed in the mission. The period leading up to an announcement was tense and consuming; the announcement itself was euphoric; the euphoria faded quickly and the company immediately needed to justify the new valuation. This cycle, repeated often enough, trained entire organizations to live in a state of anticipation. The high wasn’t really about the money — it was about the approach to the money, and the brief, bright moment before the next chase began.
Fear of missing out amplified all of this. Behavioral economists have documented that loss aversion is one of the most robust findings in the study of human decision-making: losses hurt roughly twice as much as equivalent gains feel good. Venture capitalists worried about missing the next generation-defining company. Talented engineers worried that joining the wrong startup meant watching peers get rich while they didn’t. Founders worried that moving cautiously would hand the market to a competitor who had no such hesitation. Psychologists call this dynamic “competitive arousal” — a state in which the presence of competition increases risk-taking beyond what the actual stakes would justify. The startup ecosystem was essentially a continuous high-stakes auction for talent, capital, and market position, and the arousal it generated was both a feature and, eventually, a serious bug.
The Architecture of Urgency
None of this happened by accident. The psychological environment of many high-growth companies was designed — partly consciously, partly through imitation of what seemed to work — to sustain a particular emotional state. The design choices were embedded in language, ritual, and the physical structure of work itself.
Mission language was central to this. Calling a company’s goal a “mission” — changing the world, democratizing access, redefining an industry — invokes a moral framework that makes ordinary business concerns feel small. When the mission is framed as urgent and historic, slowing down feels not just unwise but vaguely disloyal. This is a powerful motivational tool, and it’s not exclusively cynical: many founders and employees genuinely believed in what they were building. But belief and manipulation can coexist, and the mission frame was also effective at suppressing legitimate questions about whether the business actually made sense.
Physical workspace design reinforced the same psychology. Open floor plans created environments with no psychological distance from work. At many startups, the office was designed to be where people wanted to be: catered meals, recreational equipment, sleeping pods for people working through the night. These amenities were sometimes framed as employee-friendly perks, and they genuinely were that. They were also, simultaneously, mechanisms for keeping people in the building for more hours than they might otherwise choose.
Equity compensation — stock options or restricted stock units that vest over time — is the most sophisticated psychological mechanism in the startup toolkit. It creates what economists call a “sunk cost” dynamic, where the time and effort already invested make it psychologically costly to leave, even when leaving would be the rational decision. Vesting schedules — typically four years, with a one-year “cliff” before any equity vests — mean that employees are always somewhere in the middle of a timeline they don’t want to abandon. There’s also a cognitive distortion specific to private company equity: it doesn’t have a daily market price, so its value is effectively whatever employees imagine it to be. During a bull market in private company valuations, this imagination could be intoxicating. During downturns — when valuations compressed, when down rounds diluted earlier grants, when IPOs were postponed indefinitely — the psychological impact could be severe, particularly for employees who had accepted lower cash compensation on the assumption that equity would make up the difference.
The Same Loop, Built Into the Product
One dimension of this era that deserves more attention is the degree to which the psychological architecture motivating employees and investors was also embedded directly into the products these companies sold. The adrenaline wasn’t just an internal organizational phenomenon — it was the core mechanism of the customer experience as well.
Ride-sharing apps used surge pricing to create urgency and scarcity in real time, triggering the same competitive arousal in passengers that the fundraising cycle triggered in founders. Trading apps — particularly those targeting retail investors during the market frenzy of 2020 and 2021 — were designed around variable reward loops nearly indistinguishable from those found in slot machines: bright confetti animations on executed trades, push notifications announcing price movements, frictionless interfaces that made buying feel effortless and made pausing to think feel unnecessary. Crypto exchanges ran twenty-four hours a day, seven days a week, eliminating the natural off-ramps that closing-bell rhythms once provided. Social media platforms, which supplied the ambient information environment for all of this, had already spent a decade optimizing for engagement by exploiting exactly the same dopamine anticipation loops.
Many of the people designing these products were drawing from the same behavioral science literature that had already shaped modern advertising, social media, and consumer technology. The reward structures showing up in fintech apps and crypto platforms weren’t invented from scratch — they were inherited from a broader ecosystem in which variable reinforcement, urgency cues, and frictionless action had already proven their effectiveness at sustaining engagement. What was happening inside these companies and what was happening to their customers were, in important respects, products of the same intellectual moment.
When the Adrenaline Wears Off
The body cannot sustain an adrenaline state indefinitely, and neither can a business. By 2022, several forces converged to change the conditions that had made the era of permanent disruption possible. Interest rates rose sharply as central banks confronted inflation that had built up partly through the pandemic years. The cost of capital increased. Investors who had previously funded growth at almost any cost began demanding a credible path to profitability.
What followed was a painful, and in some ways clarifying, correction. High-profile companies that had raised enormous amounts of capital at spectacular valuations found themselves laying off large portions of their workforces. Some that had been considered likely candidates for transformative IPOs quietly reduced their ambitions. A few collapsed entirely. The companies that survived — and many did, often emerging leaner and more focused — discovered that some of the urgency they’d operated under had been not a feature of their industry but an artifact of cheap money and collective enthusiasm.
The correction revealed something the adrenaline had been masking: a widespread exhaustion among the people who had built these businesses. Burnout — defined by the World Health Organization as a syndrome resulting from chronic workplace stress that has not been successfully managed — became one of the defining workplace phenomena of the early 2020s. Burnout is not simply tiredness. Neuroscientifically, it represents a kind of system failure: the stress-response mechanisms that evolved to handle short-term emergencies become dysregulated when run continuously, eventually leading to a state where the body’s ability to respond to stress is itself impaired. The person experiencing burnout doesn’t feel urgently stressed — they feel nothing in particular, a flat affect that can be confused with laziness or depression but is physiologically distinct from both.
For many people who lived through the peak of this period, burnout had a specific texture that the clinical definition doesn’t fully capture. Work that had once felt urgent and meaningful began to feel like an elaborate performance of caring about things that no longer registered emotionally. Emails arrived and were answered; meetings were attended; deliverables were delivered — but the internal experience was one of hollow motion, like going through choreography after you’ve stopped feeling the music. Colleagues who had once been energizing became sources of low-grade dread. Small setbacks that would previously have been absorbed without much trouble now produced a disproportionate sense of futility. This wasn’t a choice or a character flaw; it was the predictable consequence of a biological system that had been run past its design limits.
For organizations, burnout is contagious. A 2020 study in the Journal of Applied Psychology found that it spreads through teams via emotional contagion — people unconsciously mimic the emotional states of those around them, and depleted, cynical colleagues pull down the motivation of even initially engaged teammates. In a culture that depended on collective urgency and enthusiasm to function, this had a corrosive effect that went well beyond the individual employees experiencing it.
What the Adrenaline Era Built — and Didn’t
It would be a mistake to conclude that businesses built on adrenaline were simply failures of judgment or character. Some of them built real things of lasting value. The urgency that drove some companies to move recklessly also drove others to solve genuinely hard problems faster than anyone thought possible. Certain categories of infrastructure — cloud computing platforms, logistics networks, machine learning research pipelines — were built at a speed that calmer, more measured approaches might never have achieved.
What the adrenaline era consistently failed to build was durable organizational culture. High-urgency environments tend to develop a culture of presenteeism — the belief that visible dedication is both a measure of competence and a marker of belonging. But cognitive performance on complex tasks degrades significantly with insufficient sleep and recovery time. A worker at their desk for fourteen hours is not doing fourteen hours of high-quality thinking; they’re doing some diminishing number of good hours and then occupying space. This was difficult to say out loud in an environment that rewarded the appearance of full engagement over its substance.
The companies that emerged healthiest from the post-2022 correction were generally those that had, even during the high-growth period, maintained some rigor about their unit economics, some genuine commitment to employee wellbeing, and some mechanism for slowing down long enough to think. They weren’t the companies with the highest valuations or the most ambitious pitches. They were the ones that understood the energy their people brought to work was a finite resource that needed to be managed, not simply consumed.
There’s a useful analogy in sports physiology. Elite athletic performance depends on the ability to generate high-intensity effort — but it depends equally on recovery. Gains in strength, endurance, and skill happen not during the effort itself but during the rest periods that follow it. Chronic overtraining without adequate recovery produces not peak performance but injury and diminished capacity. Companies that treated urgency as a permanent state were training in a way that physiologists would recognize immediately as counterproductive.
The Shift That Followed
By the mid-2020s, the vocabulary of the startup world had begun to change in noticeable ways. “Efficiency” replaced “growth” as the signal virtue in investor conversations. “Sustainable” — a word that would have sounded almost timid at a 2019 pitch meeting — became something founders said with genuine pride. Layoffs that would once have been treated as failures were reframed as “right-sizing” for a new environment, though the people whose jobs were eliminated experienced them in more immediate terms.
The rise of artificial intelligence added a new layer of complexity to this shift. AI tools — particularly large language models and code-generation assistants that became widely available starting in 2023 — raised a new version of the old urgency: companies felt pressure to adopt AI rapidly or risk being outpaced by competitors who did. The adrenaline-driven logic reasserted itself in a new form. The tools changed; the psychological structure of the competition remained largely the same.
Whether the broader lessons of the adrenaline era will change the way organizations approach urgency over the longer term is genuinely uncertain. Cultural memory in business is shorter than most people realize. The conditions that produced the boom — cheap capital, collective enthusiasm, a widespread belief that transformative change was imminent — created the adrenaline. Different conditions created a different psychology. If conditions of the earlier kind return, the behaviors they produced will likely return with them, regardless of how clearly the costs were visible in retrospect.
What Businesses Built on Adrenaline Teach Us
There are a few things worth holding onto from this particular era. One is that the psychological mechanisms that drive organizational urgency — adrenaline, dopamine, cortisol, competitive arousal, loss aversion — are not unique to startups. They operate in any organization that creates conditions of high stakes, variable rewards, and collective urgency. Sports teams. Political campaigns. Media organizations racing to break news. Military units. The startup world made these mechanisms visible in an unusually explicit way, which gives us a clearer view of something that was always there.
Another is that the relationship between urgency and performance is not linear. Up to a point, pressure and excitement improve performance — this is well-established in research going back to the Yerkes-Dodson law of arousal and performance, which identified that moderate arousal tends to produce better outcomes than either very low or very high arousal. The startup era, at its worst, pushed consistently past the point of diminishing returns, into a zone where urgency was eroding the judgment it was supposed to sharpen.
Finally, there’s a question worth sitting with: what is urgency actually for? In biology, the stress response exists to help an organism survive a genuine threat. In business, urgency makes sense when the stakes are real and time-sensitive, when the competition is actual rather than imagined, when moving faster genuinely produces better outcomes rather than just producing more. When urgency is manufactured — when it’s a cultural artifact rather than a response to real conditions — it consumes resources without generating the returns it promises. The businesses that navigate the next era most effectively are likely to be those that can distinguish between the two, and that build organizations capable of real speed when it’s needed, and real rest when it isn’t.
