1장
The Confidence Code: Unlocking the Science and Art of Self-Assurance
When Oprah Winfrey was asked what she wished she'd known earlier in life, she didn't hesitate: "I would have understood the power of my own confidence sooner." This sentiment resonates with millions of women who struggle with self-doubt despite impressive achievements. The Confidence Code, a New York Times bestseller that sparked a global conversation about women's confidence, reveals a startling truth: success correlates more closely with confidence than competence. This revolutionary insight has transformed how Fortune 500 companies approach leadership development and inspired universities to redesign curriculum around confidence-building. The book's impact extends beyond boardrooms to celebrities like Taylor Swift, who cited it as instrumental in helping her overcome performance anxiety. What makes this exploration of confidence so compelling is its unique blend of neuroscience, psychology, and practical wisdom that transforms an enigmatic quality into something we can all cultivate-regardless of our genetic predispositions.
2장
The Confidence Paradox: Why Being Good Isn't Enough
At a Washington Mystics basketball practice, we expected to find the essence of confidence in these professional female athletes with their commanding presence and masterful skills. Instead, star players Monique Currie and Crystal Langhorne revealed familiar doubts. "Sometimes players struggle with confidence," Monique admitted. Crystal noted women players worry about letting down teammates after bad games, while men simply think "I had a bad game" and move on. Their coach, who once recruited Michael Jordan, identified women's tendency to dwell on failure as their biggest psychological impediment.
This pattern appeared everywhere we looked. Naval Academy graduate Michaela Bilotta, selected for the prestigious Explosive Ordnance Disposal team, attributed her achievement to "luck" despite objectively measured accomplishments. Hillary Clinton admitted fearing public failure before her Senate run. Former Labor Secretary Elaine Chao confessed constant self-doubt: "I'm Asian American, are you kidding? My fear was newspapers would have headlines like: 'Elaine Chao Failed, Disgraced Whole Family.'"
Even tech entrepreneur Clara Shih, who founded Hearsay Social and joined Starbucks' board at twenty-nine, felt "like an imposter" at Stanford despite finishing first in her computer science class. "I realized I had deserved to be there all along and that some of the geeky guys who talked a big game weren't necessarily smarter."
This confidence deficit is well-documented. Half of professional women report self-doubt compared to less than a third of men. Women initiate salary negotiations four times less often than men and ask for 30% less when they do negotiate. Female business students expect to earn 20% less than male classmates five years post-graduation-effectively valuing themselves less than men value themselves.
In experiments, women consistently underestimate their abilities and performance. After taking identical science quizzes, women rated their abilities lower than men and predicted worse scores-despite nearly identical actual results. When invited to join a science competition afterward, only 49% of women signed up versus 71% of men.
What's most dismaying? Berkeley psychologist Cameron Anderson's research shows confidence matters more than competence for achieving status and influence. Overconfident students who claimed knowledge of fake historical figures achieved the highest social status among peers. This genuine self-belief-not arrogance-is what sways people. Having talent isn't merely about competence; confidence is actually part of that talent.
Beyond professional advancement, confidence is essential for well-being and happiness. Without it, we can't achieve "flow," that euphoric state of perfect concentration. Buddhist expert Sharon Salzberg describes confidence as "the way we meet our circumstances... It's almost like a wholeheartedness, where we're not holding back."
3장
The Action Principle: Confidence as Doing, Not Thinking
Neuroscientist Adam Kepecs prefers studying confidence in rats rather than humans because rats display unfiltered behaviors that reveal their genuine certainty levels. His research suggests confidence is a basic biological quality all species possess-not just a human psychological construct.
At Georgetown University, ambitious young women attending a Running Start workshop revealed the confidence gap in stark terms. Despite their desire to run for political office, not one raised her hand when asked if she felt confident about running. Their concerns echoed familiar themes: fear of appearing pushy, internalizing criticism, and anxiety about being labeled a "bitch" for showing ambition. Jessica Grounds, Running Start's cofounder, explained these talented women need confidence training more than campaign skills-they have the ability but lack the self-belief to transform desire into action.
Major General Jessica Wright, Undersecretary of Defense for Personnel and Readiness, embodies confident leadership while remaining authentically feminine. Despite feeling nervous when becoming the first woman to command an army combat brigade, she didn't let anxiety stop her. Wright demonstrates decisive leadership, standing up for herself even as a new lieutenant when told a superior "didn't like females in the military." Her confidence manifests as action, boldness, and decisiveness while maintaining honesty and comfort in her own skin.
Psychology professor Richard Petty perfectly summarized confidence: "It's the stuff that turns thoughts into action." This definition became our organizing principle, explaining the virtuous circle where confidence stimulates action, which creates more confidence. Confidence is what distinguishes those who imagine from those who do.
While confidence has several related "cousins," each plays a distinct role. Self-esteem is a value judgment about oneself ("I am valuable") that's more stable than confidence. Optimism is an expectation of favorable outcomes-not about self-worth but about interpreting the world positively. Self-compassion involves treating ourselves with the same kindness we show friends and recognizing our failures as part of shared human experience. Self-efficacy is the belief in one's ability to succeed at specific tasks.
Research suggests that a slight tilt toward overconfidence is optimal, as it's biologically useful to have "a little extra confidence for good measure in the face of uncertainty." This encourages action rather than mere contemplation. Confidence ultimately distinguishes those who imagine from those who do, and may be something we can all actively choose to create.
4장
The Biology of Belief: Our Confidence Inheritance
The search for confidence's biological roots led us to neuropsychologist Steve Suomi's research facility in Maryland, where 300 rhesus monkeys reveal striking personality differences. Suomi discovered that some monkeys are indeed born with the hard-wiring to be more confident than others, with clear biological characteristics appearing early in life.
The key finding centers on the serotonin transporter gene (SLC6A4), which humans share only with rhesus monkeys. This gene regulates serotonin levels and comes in three variants: two short strands (rare, linked to depression and anxiety), a long and short strand (moderate serotonin processing), and two long strands (optimal serotonin use, linked to resilience and confidence). Monkeys with the longer strands demonstrate more confidence through risk-taking, social engagement, and leadership behaviors.
Scientists believe confidence is about 25-50% genetic. Robert Plomin's groundbreaking 20-year study of 15,000 sets of twins revealed two striking findings: confidence predicts achievement even more than IQ does, and confidence appears to be about 50% genetic. By comparing identical twins (who share identical DNA) with fraternal twins (who share only similar DNA), researchers found confidence scores were significantly more similar among identical twins.
The biological foundation of confidence involves several key neurotransmitters. Serotonin enables rational decision-making by calming the prefrontal cortex while quieting the fear-based amygdala. Oxytocin encourages social interaction and optimism, with some people born with genetic variants that provide more of this "cuddle hormone." Dopamine drives curiosity and risk-taking, with genes like DRD47R (the "adventure gene") and COMT (the "warrior/worrier gene") determining how we process this crucial neurotransmitter.
But genetics aren't destiny. The epigenetic revolution shows that environmental influences can actually turn genes on and off, changing how they behave. Most profoundly, these epigenetic changes may be passed to our children immediately, rather than requiring multiple generations as Darwin proposed.
Suomi's monkey research reveals that by cross-fostering anxious, genetically fearful baby monkeys with highly supportive mothers, these monkeys didn't just overcome their genetic predisposition-they thrived beyond their peers. This supports the emerging "orchid theory": while most children are like hardy dandelions, able to grow anywhere, some are like orchids-more sensitive to their environment but capable of extraordinary flourishing with proper care.
Most revolutionary for building confidence is brain plasticity-our ability to physically rewire our brains through changed thinking and new mental habits. Studies show remarkable brain changes after just eight weeks of meditation, with the amygdala (fear center) shrinking while the prefrontal cortex (center of calm reasoning) shows increased activity. As Laura-Ann Petitto explains, we can literally "reroute the highway" in our brains, building new neural pathways that bypass early negative patterns. Though we're born with certain predispositions, our environment significantly modifies them, offering us genuine choice in developing confidence.
5장
The Gender Gap: Why Women's Confidence Falters
While genetics partially explain confidence differences, they don't fully account for the gender gap. At institutions like the U.S. Naval Academy, female students face derogatory labels like "DUBs" (dumb ugly bitches), exemplifying the hostile environments women often navigate. Despite women's educational achievements-now earning more degrees than men at all levels-workplace inequities persist, with women earning 77 cents to a man's dollar and comprising just 4% of Fortune 500 CEOs.
The seeds of women's confidence issues are planted in elementary school, where girls are rewarded for being good, quiet, and compliant rather than energetic or assertive. Girls learn early that cooperation brings approval, and they begin craving this validation. This conditioning discourages risk-taking and mistake-making-behaviors essential for building confidence. Research shows boys take failure in stride, attributing it to lack of effort, while girls internalize mistakes as reflecting their inadequacy.
Girls excel academically but miss crucial lessons from competitive environments like sports. Despite Title IX increasing girls' athletic participation 1,000 percent since 1972, fewer girls than boys play sports, and they're six times more likely to quit teams. This creates a vicious cycle: girls lose confidence during adolescence, quit competing, and miss opportunities to build resilience. Meanwhile, boys learn through roughhousing and competition to discount criticism and embrace risk-skills that translate well to workplace success.
Women face a double bind: when they display the same confidence as men, they face social and professional penalties. Studies show women who act assertively are often disliked or labeled negatively. Victoria Brescoll's Yale research demonstrates this bias: both men and women rated a fictional female CEO who spoke frequently as less competent than a male CEO who talked the same amount.
Women's relationship with physical appearance profoundly impacts confidence. The statistics are stark: 90 percent of women want to change their appearance, 81 percent of ten-year-old girls fear becoming fat, and only 2 percent of women consider themselves beautiful. This preoccupation creates another confidence barrier, as women are judged more harshly on appearance than men in both professional and personal contexts.
Beyond external factors, women sabotage their own confidence in several key ways. We prioritize being liked over being respected, making tough workplace negotiations difficult. We're hypersensitive to criticism and ruminate excessively, spending hours in self-recrimination rather than solution-finding. Perhaps most crippling is our perfectionism-we hold back until we're absolutely ready, while men "send stuff like crazy."
Male and female brains show subtle structural differences: women have more brain cell matter in the frontal cortex (reasoning) and limbic cortex (emotions), more white matter for integrating information, and better connectivity in the corpus callosum. Female brains show more activity-30% more neurons firing at any time-which explains women's multitasking abilities but also their tendency toward overthinking and anxiety.
Testosterone significantly influences confidence differences. Men have ten times more testosterone after puberty, fueling risk-taking and competitive instinct. Studies show traders with higher testosterone make riskier trades, and winning creates more testosterone-the "winner effect." However, testosterone has downsides-it reduces cooperation and perspective-taking abilities. Meanwhile, estrogen encourages bonding and social skills but may hinder confident action by promoting conflict avoidance.
6장
Building Confidence: The New Nurture
Jane's childhood experience of walking home from school alone at age four and a half taught her she could handle challenges, leading her to become a leader by age six. She reflects that confidence isn't innate but built through repeatedly conquering small fears: "My mother didn't show me any fear, she just said she knew I could do it... It was doing hundreds of those small things that built my confidence as an adult. You're not born with it. You build and you build."
Building confidence requires hard work, substantial risk, persistence, and sometimes bitter failure. Experts agree that enduring hard knocks early in life builds resilience fastest. Psychologist Nansook Park recommends "graduated exposure to risk" for children-not trauma, but carefully introduced challenges with guidance. Failure is essential for building resilience, though it must be handled constructively.
Stanford psychologist Carol Dweck's concept of a "growth mind-set" is foundational to developing confidence. People with growth mind-sets believe they can improve and learn new skills, while those with fixed mind-sets believe their abilities are immutable. Women tend to have fixed mind-sets about areas like math, leadership, and entrepreneurship, while men typically believe they can learn almost anything. A growth mind-set encourages risk-taking and builds resilience when facing failure.
Linda Hudson, the first woman to head a major defense company, embodies the confidence that comes from embracing uniqueness. Throughout her career of breaking barriers in the masculine world of defense contracting, Hudson has been comfortable standing out. Her parents encouraged her authentic self rather than pushing her toward traditional femininity. Psychologist Caroline Miller emphasizes that confidence comes from stepping outside your comfort zone toward goals aligned with your own values, not society's expectations.
Relying on external validation undermines genuine confidence. Ohio State psychologist Jennifer Crocker found that students who based their self-worth on others' approval experienced more stress and higher rates of substance abuse than those with internally-derived confidence. While men generally depend less on praise than women do, anyone whose confidence hinges on external validation becomes vulnerable when that approval inevitably fluctuates.
7장
Practical Confidence: Failing Fast and Other Confidence-Boosting Habits
The ideal paradigm for building female confidence is "failing fast"-embracing small, manageable failures that become part of your DNA. Rather than avoiding failure, women should seek it out in controlled doses. This approach stops rumination and analysis paralysis while encouraging action.
The authors emphasize that action builds confidence, especially when it involves risk and failure. They recommend starting with simple steps to leave your comfort zone-making conversation with strangers at parties, practicing asking for promotions with trusted friends-before building to bigger risks. For women, risk often means allowing imperfection, braving others' displeasure, or becoming comfortable with attention.
The female brain works against confidence by thinking too much about the wrong things. Rumination drains confidence through negative thoughts and nightmare scenarios that masquerade as problem-solving. Even accomplished neuroscientist Laura-Ann Petitto struggled with this tendency, mentally listing her perceived failings during bus rides home. Her solution was consciously replacing negative thoughts with three achievements.
Negative automatic thoughts (NATs) are the front-line assault on confidence-buzzing around more frequently than positive thoughts and multiplying rapidly. Research shows that physically disposing of negative thoughts helps diminish their power. When students wrote down negative thoughts and were instructed to tear them up and throw them away, they began questioning the validity of those thoughts.
Counterintuitively, focusing on ourselves often inhibits confidence rather than building it. When we make ourselves the center of our own melodrama, we tend to become paralyzed by self-judgment. The authors suggest redirecting attention away from yourself and toward how your actions benefit others. For nervous public speakers, reframing your remarks as being on behalf of the team rather than yourself shifts the spotlight and builds confidence.
To move from "me" to "we," realize that others aren't constantly thinking about you. Most people are too busy with their own lives to dwell on your triumphs or failures. When facing criticism at work, remember it's about the work, not about you personally.
Women often have the spotlight backward-highlighting their faults while hiding their accomplishments. The authors argue there are times when we need to move from "we" back to "I" and own our value. Being self-deprecating might seem appealing, but it tells a damaging story to ourselves and others that we don't deserve our achievements.
Self-generated confidence comes from work and mastery. Naval Academy graduate Michaela Bilotta built her confidence along with her biceps through persistent practice of pull-ups, despite hating them. Similarly, basketball player Crystal Langhorne transformed from doubting her career to becoming an all-star by dedicating hours to remaking her shooting style.
Public speaking represents an iconic challenge to female self-assurance. The authors emphasize that projecting yourself effectively requires overcoming self-consciousness, noting that even if you blush or mix up words, "the ground does not open to swallow you whole." They offer practical advice: use your own natural style rather than trying to emulate forceful speakers; speak on behalf of others to feel more powerful; and most importantly, banish upspeak-that questioning tone at the end of sentences that undermines authority.
Beyond major confidence habits, quick-fix strategies include meditation, practicing gratitude, breaking overwhelming challenges into manageable pieces, and basic self-care-sleep, exercise, and social connection. Simple physical adjustments like sitting up straight or nodding while speaking create immediate confidence boosts. However, they warn against "faking it till you make it," which creates anxiety through masquerading as something you're not. Instead, they recommend taking genuine action: "Do one small brave thing, and then the next one will be easier, and soon confidence will flow."
8장
Passing It On: Raising Confident Children
Psychologist Jim Stigler observed Japanese teaching methods where struggling students were encouraged to persist through difficulty in front of classmates until achieving success-contrasting sharply with Western approaches that avoid exposing student struggles. The authors argue that confidence is one of the most important qualities to instill in children-not through empty assertions that they can be anything, but by developing "faith in their ability to make things happen, to risk failure, and to maintain inner calm."
Japanese education embraces struggle as opportunity, routinely assigning tasks slightly beyond students' current abilities to teach persistence. The authors warn against the self-esteem movement's excesses, citing psychologist Jean Twenge's concerns about raising narcissistic millennials through constant praise and participation trophies. When children never experience failure, they lack essential coping skills for adulthood.
Dermalogica founder Jane Wurwand admits she may have done her children a disservice through overindulgence and proposes a simple remedy: teach children basic life skills. Rather than focusing only on advanced accomplishments like ballet or Chinese language, parents should ensure children can handle everyday tasks like cooking simple meals, doing laundry, and taking public transportation.
Building confidence in girls requires conscious effort to make them more assertive and independent, and less focused on being "good." Girls learn early that being helpful, quiet, and well-behaved earns praise, creating a reward cycle that discourages speaking up. This constant pressure for good behavior undermines workplace confidence later. Boys who shrug off nagging and break rules develop the same impulse that helps them ask for raises without fear of upsetting superiors.
Perfectionism stifles achievement and confidence. High-achieving girls often push themselves to breaking points, becoming overachievers who take on too many projects, focus excessively on details, and alienate peers. To discourage perfectionism: praise moderately rather than excessively, help your daughter feel satisfied with her best effort regardless of comparison to others, show your own imperfections, and use humor when mistakes happen.
Despite girls' equal capability in math and science, fewer than 5% expect careers in engineering or computer science compared to 18% of boys. To counter stereotypes: create narratives placing your daughter in scientific contexts, avoid putting down your own math abilities, and encourage physical activity. Sports provide essential training for real life, teaching teamwork, winning, losing, and overcoming failure.
Many confidence-building lessons for daughters apply to other women in our lives. Sometimes simply knowing confidence is a choice can spur growth. A crucial first step is encouraging women to recognize and talk about their successes. A 2011 Catalyst survey of 3,000 MBA graduates found that of nine "ideal worker" strategies, only one significantly helped women advance: making achievements known to superiors.
9장
Authentic Confidence: The Science and the Art
When our genetic test results arrived, we discovered we both have the met/met variant of the COMT gene-making us "worriers" who perform well in routine conditions but struggle with confidence in high-risk settings. We both have the nurturing OXTR gene variant that makes us feel positive about people and the world. For the serotonin transporter gene critical for confidence, we both have a combo short/long variant, indicating a predisposition to anxiety depending on life circumstances.
Despite having identical gene variants, our personalities differ significantly-Katty is more decisive while Claire is more deliberative; Katty enjoys physical risks but avoids confrontation, while Claire handles difficult negotiations easily but avoids steep ski slopes. These differences demonstrate how we've imposed our own natures onto our genetic footprints, creating unique neural pathways. Our life experiences have outweighed genetic predispositions, allowing us to perform with genuine self-assurance even under stress.
Authenticity is the linchpin of confidence. When confidence emanates from our core, we are at our most powerful. This was Christine Lagarde's point when she warned against leaning in exactly like men do. She shared a story about a female president who reduced her motorcade from twenty-five cars to five despite criticism that she was undermining the presidency. Lagarde advised her to "dare the difference"-to make authenticity her strength rather than measuring herself against male standards.
Two years into our research, what began as a gloomy investigation of "The Confidence Gap" transformed into an exhilarating discovery of solutions. We distilled our findings into a simple code: Think Less. Take Action. Be Authentic. Confidence is within reach, and its rewards extend beyond workplace achievements to a sense of purpose and fulfillment.
Watching basketball stars Monique Currie and Crystal Langhorne in action, we witnessed the culmination of practice and purpose-the zone of confidence. When Crystal missed a shot but later executed a perfect layup, her look said "I knew I could do it." She's earned her confidence through action, making it real and attainable for all of us.
