Most of us like to think were pretty rational. We weigh pros and cons, calculate risks, make "adult" choices and then move on. But if you step back and look at how people actually operate, its hard not to smile a little: were experts at overestimating ourselves, underestimating risk, and believing the future will somehow sort itself out. And its not just poor judgment or naivety. According to cognitive neuroscience, its partly by design.
In The Optimism Bias (2011) Tali Sharot shows how our brains are almost wired for optimism for better and worse. She explains why so many of us walk around with mental "pink-tinted glasses," how this affects choices, motivation and mental health, and why moderation is key. In this article we use ideas from the book to explore self-insight and personal growth: How can you understand your own optimism (or pessimism), and actually use it as a tool in personal development and psychological development? And yes well also touch on MBTI as a practical conversation starter for reflection, without pretending its a personality "answer key."
One of the most fascinating points Sharot highlights is how convinced we are that we see the world as it is while in practice we see the world as our brain interprets it. Its not necessarily conscious lying or self-deception; its more a built-in filtering system.
Ask yourself (honestly): Are you a better driver than average? More cooperative? More honest? If, like most people, you instinctively place yourself "a little above average," youve met a classic: superiority bias. The statistical problem is obvious: not everyone can be in the top quartile.
This is not just a funny curiosity. In practice it affects how we receive feedback, how we handle conflict, and what we believe we "deserve." For self-insight it means you should have a small mental alarm that says: "When I evaluate myself, I might be a bit more generous than I think." Not to tear yourself down, but to give yourself a more accurate map before you set out on the journey toward personal growth.
Sharot also points to research that shows how easily we can be fooled not just by others, but by ourselves. In an experiment led by cognitive researcher Petter Johansson, participants chose who they found most attractive from two photos. Later some photos were swapped so participants were presented with the "choice" they had actually rejected. Surprisingly many didnt notice the swap and calmly explained why the "chosen" photo was best.
The point isnt that were stupid. The point is that our brains are extremely good at creating coherence and meaning after the fact. This is gold for psychological development, because it says something about how confident we can be even when were wrong. Its also a reminder that "I feel it this way, therefore it must be true" is a weak standard for truth.
Sharots main theme is optimism bias: the tendency to overestimate the likelihood of positive events and underestimate the likelihood of negative ones. She cites research (including work by psychologist David Armor) suggesting that around 80% of people show some form of this skew.
That doesnt mean 80% go around thinking "everything will be perfect." It more subtly means we assume things will go a little better for us than neutral numbers indicate. Many underestimate probabilities related to health problems, accidents or breakups while overestimating chances of career progress or "that things will work out."
An important nuance: we are typically more optimistic for ourselves and our close ones than for "people in general." One example Sharot mentions is that many are optimistic about their own familys future, yet far more pessimistic about societys trajectory overall. That says something interesting about control: we believe we can steer our own fate more than we really can.
This is a useful mirror for self-insight. Ask: "Where do I assume I have control just because it feels better?" Personal growth often hinges on distinguishing between what you can influence and what you just hope you can influence.
One of the books most exciting parts is the link between psychology and neuroscience. Using fMRI research, Sharot points to two brain systems that are central:
When the interaction between these areas causes positive stimuli to get more attention, youre also more likely to imagine positive future scenarios vividly. Negative scenarios often become vaguer, more distant, less "real." Its a bit like the brain saying, "Thatll probably work out" and then it actually feels that way.
Sharot also describes an interesting spectrum: with severe depression the future can feel dark, and negative scenarios become strong and intrusive. At the same time theres a phenomenon called depressive realism, where mildly depressed people may be more accurate in certain predictions not necessarily more pessimistic, but less "biasedly optimistic."
For personal development this is an important ethical and practical reminder: the goal isnt to "force" optimism if youre struggling. The goal is to understand the mechanisms and find a balance where you can both see realities and preserve hope and agency.
It almost sounds too simple: "Think positive and youll succeed." But Sharots point isnt poster-psychology. What she argues is that optimistic expectations can produce concrete, measurable benefits because they affect what you actually do.
When you expect something might go well, youre more willing to invest time and energy. That means more attempts, greater persistence and a higher probability you actually get a good result. Think of everything from exercise to job hunting: if you secretly believe "its worth it," you show up more often.
Sharot discusses research (including work by Sara Bengtsson) showing that expectations influence how we learn from errors. When you expect to perform well and then fail, a clear "gap" appears between expectation and outcome. That gap seems to trigger learning: the brain becomes interested in adjusting strategy. But if you expect to do poorly and then do poorly, theres less informational value. It just feels like confirmation.
This is one of the most practical points for personal growth: a little optimism can make you more open to learning, because the mistake becomes a surprise you can use, not a verdict you must accept.
A common pessimistic life rule is that low expectations mean less disappointment. But Sharot points to research suggesting people with low expectations are often just as disappointed when things go badly as those with high expectations. In other words: you get the pain, but lose the fuel.
An underrated part of the book deals with how we feel the future before it happens. The brain simulates upcoming events, and many of the same systems are activated whether you experience something directly or just imagine it. Thats why anticipatory anxiety can become its own prolonged form of suffering.
If you procrastinate dentist visits, a difficult conversation, or the financial review you know you should do, you can end up running a "mental marathon" for days. The pain isnt only in the event its in the prolonged simulation.
Sharot argues that optimists often imagine positive events more vividly, believe theyre more likely, and experience them as "closer in time." Negative events become weaker in imagination, less likely and more "something that happens later." That produces lower levels of chronic worry.
For self-insight you can test this practically: next time you dread something, ask: "What exactly am I imagining? How vivid is the picture? And what is the real likelihood?" Simply separating fantasy from facts can give a small but important regulation.
Sharot describes a phenomenon almost comically relevant in a world full of choices: once weve chosen, the brain often adjusts our preferences so the choice feels better. Its not just that we say were satisfied; reward systems in the brain (including the caudate nucleus) actually update the valuation of alternatives.
That means you might have rated Greece and Thailand equally, but once you book Greece your brain starts "finding" more reasons Greece was the right pick. This reduces doubt and makes us more stable in daily life. Without this mechanism we could be stuck in endless second-guessing.
Heres a practical twist: when youve made a choice thats good enough, you can actively support this brain mechanism by asking:
This isnt self-deception; its shifting focus from "did I choose perfectly?" to "how do I make this work?" a classic shift from loss of control to room for action in psychological development.
Optimism isnt just cozy. It can also blind us. Sharot uses historical and experimental examples to show that people often ignore information that threatens a positive view of the future. She describes how leaders can overlook clear warnings, and how everyday people do the same on a smaller scale.
Sharot conducted studies where participants estimated their own risk for various negative events (like serious illness). Afterwards they were given statistical information about actual risk and asked to estimate again. Many adjusted their estimate when the news was better than they thought (i.e., risk was lower). But they adjusted little or not at all when the news was worse than they believed.
In other words: the brain is good at learning from positive surprises, but "bad surprises" slide off more easily. That can be directly harmful for health, finances and relationships because early correction is often what keeps problems manageable.
Sharot is clear: optimism works best in moderate doses. She cites research by economists Manju Puri and David Robinson, who found that moderate optimists often make more sensible life choices than both pessimists and extreme optimists.
Moderate optimists can, for example:
A well-known example is big projects that underestimate time and cost. Sharot uses the Sydney Opera House as an illustration: initial estimates were far lower than the final outcome, both in duration and budget. The point isnt to shame architects or project managers, but to show how common "itll probably be fine" thinking is even among experts.
In the public sector people have tried to curb this with guidelines that require adding empirical "optimism bias" uplifts to estimates. The effect isnt perfect, but its an attempt to build moderation into the system.
If you want to use the books insight for personal development, start by mapping where you typically fall on the scale:
The next step is to ask: What does my style cost me and what does it give me? This is where self-insight becomes practical, not just introspective.
MBTI often appears in conversations about personality and personal growth. Its important to be sober: MBTI is popular, but its not a perfect scientific measure of human nature. Still, it can work as a language for reflection, especially if you use it as a hypothesis rather than an answer key.
Some MBTI dimensions can resemble how optimism shows up in practice:
A useful exercise: regardless of MBTI type, notice where you become optimistic. Is it about health? Money? Relationships? Career? Optimism bias is often domain-specific, not a whole-person trait.
Optimism bias is extra relevant in a digital everyday life. We tend to assume "my data isnt interesting," "no one will see it," or "that applies to other people." But modern technology makes small choices have bigger consequences.
A recent example from the Norwegian tech news scene involved shared ChatGPT conversations appearing in Google search results. In a Shifter piece it was noted that some shared conversations contained sensitive information like CVs and job applications, and it was emphasized that conversations are not public unless you choose to share them. As the article states: "ChatGPT conversations are not public unless you choose to share them."
This is a perfect small case of optimism bias in practice: we think we understand sharing, but underestimate how content can be spread, indexed and retrieved. For self-insight it means you should check yourself on phrases like "itll probably be fine" when it comes to privacy.
Here are some low-threshold exercises that bring Sharots points down to ground level.
Write two short scenarios about an upcoming situation you care about (meeting, exam, difficult conversation):
This keeps optimism alive but nudges it toward moderation.
When you think "that wont happen to me," stop and ask:
Pick one thing youve postponed because youre dreading it. Do a micro-version today: book an appointment, send one sentence, open the document. The idea is to shorten the period your brain simulates the pain.
If something goes wrong, note:
This uses the mechanism Sharot describes: the gap between expectation and outcome becomes fuel for learning if you actually capture it.
The Optimism Bias offers a liberating picture of humans: were not only logical machines, nor hopeless self-deceivers. Were biological systems largely built to keep morale up. Roughly 80% of us tend to see our own future in a slightly brighter light than the numbers suggest. That can make us more motivated, more persistent and better at learning from mistakes. It can also help us handle difficult situations by shifting attention to whats still possible.
At the same time optimism has a cost: we take in positive corrections more easily than negative ones. We can ignore warning lights, underestimate risk and overstate our own control. In everyday life that can mean anything from poorer health choices to sharing more online than we should because "itll probably be fine."
The most mature form of personal growth is therefore not to become eternally optimistic or proudly pessimistic, but to train self-insight to choose moderate optimism: hope with grounding. Dreams with buffers. Belief that things can go well, combined with the willingness to see what could go wrong early enough to do something about it. And thats a kind of psychological development that actually produces results, not just good feelings.