Stepping Out of the Shadows

2026-06-22 - source - Read full transcript

Shankar Vedantam (host)Alison LedgerwoodDavid Pizarro

Key insights

The brain evolved to overweight negative information because doing so had clear survival value, and the bias remains functional today rather than being a pure flaw.

Ledgerwood frames this as an evolutionary story: a brain that fixates on a spotted tiger and keeps saying 'tiger, tiger, tiger' outlives one that gets distracted by a pretty tree. That same circuitry, now aimed at one critical student evaluation out of 300 glowing ones, still helps people learn from real mistakes and notice real threats, so the dilemma is that a mechanism useful for survival also manufactures a lot of unnecessary unhappiness.

negativity-bias

Identical statistical information produces very different judgments depending on whether it's framed as a gain or a loss.

Kahneman and Tversky's 1981 study found people become risk-averse when a disease outbreak's outcomes are framed as lives saved, and risk-seeking when the same outcomes are framed as lives lost. Ledgerwood extends this to hiring decisions (a team with 30 of 50 successes is funded more readily than one with 20 of 50 failures) and medical decisions (a 70% survival rate sounds better than an identical 30% mortality rate).

reframing

People switch easily from a positive frame to a negative one, but get stuck once they start negative.

In Ledgerwood's own studies, participants shown a positive frame first (survival rate) readily updated their opinion when shown the negative reframe (mortality rate). But participants shown the negative frame first stayed negative even after being shown the mathematically identical positive reframe. A timed math task confirmed the asymmetry: converting a negative number to its positive equivalent took people measurably longer than the reverse.

reframing

Trying to suppress negative emotion makes it rebound stronger, so managing negativity bias means adding positive attention rather than blocking negative attention.

Ledgerwood cites research showing suppressed negative emotions come back more intensely. Her recommended alternative is deliberately practicing noticing and recording positives, a skill she compares to learning a new driving route: effortful and awkward at first, then increasingly automatic with repetition.

emotional-regulation

Sharing positive news with other people, not just feeling it privately, produces measurable health benefits.

Ledgerwood cites her colleague Tomiko Yoshida's research on older couples: sharing positive emotions with a partner lowered cortisol and had a lasting effect through the day, an effect not produced by feeling the same positive emotion alone. Ledgerwood's household practice of posting successes on the fridge, hers, her partner's, and her kid's, operationalizes this.

relationships

People adapt to positive changes in circumstance faster than they process negative ones, so good news quickly recedes into the background.

Ledgerwood describes getting a research grant approved and feeling joy for about two seconds before the next sentence revealed the funding had been cut in half; the disappointment dominated even though, moments earlier, having no grant at all would have felt like the worst outcome. She ties this to broader research on hedonic adaptation to circumstances.

negativity-bias

Small, deliberate interruptions (humor, playfulness) can break a negativity spiral before it escalates.

Ledgerwood describes defusing an escalating family tablecloth-stain crisis by deliberately making a bigger mess and laughing about it, turning stress into shared amusement instead of mutual sniping. She contrasts this with the norm of reciprocity, where rudeness typically begets rudeness, arguing the harder but more valuable move is responding to negativity with kindness.

emotional-regulation

Reframing a mistake as a learning opportunity does not remove the bad feeling, but it redirects the energy productively.

Ledgerwood calls this 'gain framing' applied to personal failure: acknowledging the mistake still stings, but consciously shifting the question from 'what went wrong' to 'what can I do differently next time' channels the same negative energy into a forward-looking plan.

reframing

Disgust is unique among emotions in that it 'contaminates' by contact, a trait rooted in its evolutionary role tracking disease before germ theory existed.

Pizarro notes that one fly on toast ruins the toast, but toast touching flies doesn't cleanse the flies; the asymmetry reflects disgust's original function of tracking contagion, and explains why it spreads so readily to adjacent objects or people by association.

disgust-psychology

We are far less disgusted by our own bodily processes, or those of people we love, than by identical acts performed by strangers.

Pizarro explains that closeness (a parent to a child, a partner to a partner) and love or lust can temporarily mute disgust responses that would otherwise fire strongly, and that people also rarely feel disgusted watching themselves do something they'd find repulsive if a stranger did it.

disgust-psychology

Disgust has historically been weaponized against marginalized groups, especially women, by tagging them with the emotion rhetorically.

Pizarro traces this to old civilizations that isolated menstruating women from camps, and to modern political rhetoric mocking women's bodily functions, arguing that framing a group as disgusting is a durable tool for signaling inferiority.

disgust-psychology

Reappraisal, consciously reframing what a stimulus means rather than just avoiding it, is a more durable strategy for managing disgust than simple avoidance.

Pizarro contrasts attentional deployment (looking away) with reappraisal (deciding stage blood is 'just ketchup'), and points to a listener's practice of recalling beautiful imagery when triggered by disgust as an example of using awe to actively displace a negative emotional state rather than merely dodging it.

emotional-regulation

Media referenced

Yuck! The Science of Disgust - podcast - Earlier Hidden Brain episode with David Pizarro that this episode's second half follows up on, answering listener questions it generated.

Companies

NASA - The Genesis space probe (2001-2004) met all three of its scientific objectives but crash-landed in the Utah desert due to a sensor installation error, and is remembered as a failure because of that single flaw.

Techniques and frameworks

Negativity bias - Ledgerwood's core framework: the brain's tendency to seek out negative information and, once it finds it, to hold onto it and resist updating, more strongly than it does for positive information.
Gain framing / loss framing - Building on Kahneman and Tversky's 1981 disease-outbreak study, Ledgerwood's own research shows people readily shift from a positive frame to a negative one but get stuck when trying to shift from a negative frame back to a positive one.
Gratitude journaling - Ledgerwood's colleague Robert Emmons found a few minutes a day writing about things one feels grateful for substantially boosts well-being; Ledgerwood describes her own halting attempt at the practice.
Capitalizing on positives with others - Research term for actively sharing good news with other people rather than just experiencing it alone; Ledgerwood cites work by colleague Tomiko Yoshida showing shared positive emotion lowers cortisol in older couples.
Attentional deployment and reappraisal - Pizarro's two named strategies for managing disgust: shifting attention away from the disgusting stimulus, or reappraising it (e.g., telling yourself stage blood is ketchup) so it no longer registers as disgusting.

Summary

This episode runs two loosely connected segments under a shared idea: negative or threatening information tends to dominate our minds far more than its objective weight warrants, and both segments explore how to notice that pull without pretending it doesn't serve a purpose. The first half is a conversation with UC Davis psychologist Alison Ledgerwood about the negativity bias, the well-documented tendency of the brain to seek out negative information and then hold onto it more stubbornly than positive information. Ledgerwood opens with personal examples: a single harsh student evaluation eclipsing 300 glowing ones, a stranger's yelled rebuke ruining an otherwise pleasant drive. She frames the bias as evolutionarily sound, a brain fixated on a lurking tiger outlives one that gets distracted by scenery, and extends the logic to geopolitics, arguing that Germany's path into World War I and the mutual threat-inflation of the Cold War both reflect the same psychology playing out at the level of nations.

The conversation's most detailed thread is framing research, building on Daniel Kahneman and Amos Tversky's classic 1981 finding that identical outcomes described as "lives saved" versus "lives lost" produce opposite risk preferences. Ledgerwood's own research adds an asymmetry Kahneman and Tversky didn't test: people readily shift from a positive frame to a negative one when new information arrives, but get stuck once they start with a negative frame, even when shown mathematically identical positive information afterward. A simple timed arithmetic task (converting a "lives saved" number to "lives lost" versus the reverse) confirmed people process the negative-to-positive conversion measurably more slowly, suggesting the asymmetry isn't just about preference but about how the information is processed.

Ledgerwood is careful not to frame the negativity bias as purely a bug: it helps people learn from real mistakes and stay alert to real threats. Her practical recommendations are additive rather than suppressive, since actively suppressing negative emotion tends to make it rebound stronger. She describes her own halting attempt at gratitude journaling (staring at a blank page, eventually writing "dog"), her household ritual of posting family members' successes on the fridge, and her partner's practice of celebrating each incremental step of a long process (a paper submission, a revision, a rejection survived) with a special dinner. She also cites a colleague's finding that sharing positive emotions with another person, not just feeling them privately, measurably lowers cortisol in older couples, an effect that solitary positive feeling didn't produce.

The second half shifts to a returning "Your Questions Answered" segment with Cornell psychologist David Pizarro, following up on an earlier episode about disgust with listener questions and stories submitted after that original conversation aired. Pizarro explains disgust's distinctive contagion property (a fly ruins toast, but toast doesn't cleanse flies), traces its likely origin as a pre-germ-theory disease-avoidance mechanism, and discusses how love, lust, and professional habituation (medical students adapting to cadavers) can mute it. Listener stories drive much of this half: a river guide's memory of a group flossing from a single unbroken strand, a woman disgusted by intimacy from strangers but not from a partner, a listener whose disgust sensitivity connects to a past eating disorder and who copes by deliberately recalling beautiful imagery.

Pizarro also traces disgust's darker social history, including its long use as a rhetorical weapon against women (from ancient practices isolating menstruating women to modern political mockery of women's bodies), and its more constructive use in public health messaging, from anti-smoking campaigns to a viral Singaporean anti-vaping ad. He closes by distinguishing attentional deployment (looking away from a disgusting stimulus) from reappraisal (consciously reframing what it means), arguing the latter is the more durable strategy, and describing how professionals like nurses, chaplains, and Mother Teresa use compassion to deliberately override reflexive disgust toward people whom others recoil from.

Notable Quotes

"The negativity bias is the tendency for our brains to look for negative information and then hold on to it once we find it." - Alison Ledgerwood

"That initial negative frame seems to stick in your head and resist subsequent attempts to change it." - Alison Ledgerwood

"It's almost as if you have, if the brain was a freeway system or a road system, then the negativity information flows on the highways, and the positivity information flows on the back streets." - Shankar Vedantam

"One fly on your toast ruins the toast, but one piece of toast on a group of flies does not somehow cleanse the flies." - David Pizarro

"What you can't do is take back the disgust that you demonstrated to somebody who was just there because they needed your help." - David Pizarro