79 ideas

Cognitive Biases & Models

Every idea in Doomscholar on cognitive biases & models. Open any one to read it in layers, with its sources.

10 Books That Sharpen Critical Thinking in an AI-Dominated WorldSteve BurnsAs algorithms increasingly curate what people see and think, independent critical thinking becomes a survival skill rather than an academic nicety — and a specific set of books (on cognitive bias, randomness, algorithmic power, and disciplined attention) function as a practical defense.
16 Mental Models to Sharpen Your ThinkingUnattributed compilationA compact reference of sixteen widely-used mental models — spanning economics, psychology, and systems thinking — intended as a checklist to apply against a decision rather than a single unifying theory.
A Constant Error in Psychological RatingsEdward ThorndikeA single positive or negative trait we notice about a person unconsciously colors our judgment of their unrelated traits — so someone judged attractive, articulate, or physically impressive gets rated as more intelligent, competent, and trustworthy too, even absent any actual evidence for those separate qualities.
All Models Are Wrong … But Some Are UsefulFarnam Street (Shane Parrish), after George BoxEvery mental model is a simplification and therefore, strictly speaking, wrong — the only meaningful question is not 'is this model true?' but 'is this model useful, and for what?' — the necessary caveat on the entire mental-models project.
An Enquiry Concerning Human UnderstandingDavid HumeWe never actually observe cause and effect itself, only one event constantly following another — so our belief in causation, and in the reliability of induction generally, is a habit of the mind formed by repeated experience, not something reason or observation can ultimately justify.
Base RatesDaniel KahnemanAnchor to what usually happens before adjusting for what makes this case special.
Chesterton's FenceG. K. ChestertonDon't tear down a fence until you know why it was put up.
Choice ArchitectureRichard ThalerThere is no such thing as a 'neutral' design. The way choices are presented to us inherently nudges our behavior in a specific direction.
Confirmation Bias: A Ubiquitous Phenomenon in Many GuisesRaymond NickersonPeople systematically seek out, interpret, and remember information in ways that confirm their existing beliefs, while ignoring or discounting evidence that contradicts them — making it one of the most pervasive and hardest-to-correct biases because it operates on what evidence gets noticed in the first place, not just how it's judged afterward.
Correlation and CausationTyler VigenTwo variables moving together over time is never, by itself, evidence that one causes the other — with a large enough dataset, data dredging alone will always turn up strong-looking correlations between things that have nothing to do with each other.
Deductive vs Inductive ReasoningFarnam Street (Shane Parrish)Deduction moves from general premises to a certain conclusion (if the premises are true, the conclusion must be true); induction moves from specific observations to a probable — never certain — general conclusion, and confusing the two (treating an inductive leap as if it had deductive certainty) is a common source of bad reasoning.
Descartes' Error & How Emotions Are MadeAntonio Damasio & Lisa Feldman BarrettEmotions aren't obstacles to rational decision-making — they're body-based signals (Damasio's somatic markers) and active predictions (Barrett's constructed emotion) that make judgment possible at all.
Descriptions Aren't PrescriptionsFarnam Street (Shane Parrish)A representation of reality (a map, a grammar book, a law, a mental model) can be read either descriptively (this is how things currently are) or prescriptively (this is how things must be) — confusing the two, especially when the description becomes outdated, causes real, avoidable problems.
Determined: A Science of Life Without Free WillRobert SapolskyEvery human action is the end product of an unbroken chain of prior causes — genes, hormones, childhood environment, immediate context, culture — stretching back before birth, which means free will in the sense most people believe in, the ability to have decided otherwise with all else being equal, does not exist.
Dunbar's NumberRobin DunbarDunbar proposed humans can maintain roughly 150 stable social relationships, capped by neocortex size — beyond that, groups need hierarchy, rules, or substructure to stay coherent.
Eight Cognitive Laws Worth Knowing EarlyCurious MindsA compact list of well-established cognitive and social effects — led by the Dunning-Kruger effect — that repeatedly explain why confident people are often wrong and quiet people are often right.
Epigenetics: Experience Writes on the GenomeConrad Waddington / Michael MeaneyEpigenetics shows experience can leave chemical marks on DNA that change gene expression without changing the code — and some marks, via careful animal models, appear responsive to stress, nutrition, and care.
Epistemic InjusticeMiranda FrickerWhen we dismiss someone's testimony or ability to know something simply because of their race, gender, or social class, we commit a unique kind of violence against them.
Fight-or-Flight & the Amygdala HijackWalter Cannon / Joseph LeDouxCannon's fight-or-flight describes the body's rapid mobilization under threat, and LeDoux showed the amygdala can route a fear signal before conscious cortex catches up — so you react before you have a reasoned perception of what you're reacting to.
Five Tips to Improve Your Critical ThinkingSamantha AgoosCritical thinking is a trainable skill built from five concrete habits — identifying a claim's origin, questioning your own information sources, spotting fallacies, considering other viewpoints, and evaluating your own reasoning process — not an innate trait some people simply have.
Game Theory (Bonanno)Giacomo BonannoNon-cooperative game theory formalizes strategic interaction — situations where your best move depends on what others do — starting from strategic-form games and building up to the equilibrium concepts that predict how rational agents behave under mutual interdependence.
Hanlon's RazorRobert J. HanlonNever attribute to malice what is adequately explained by carelessness.
Hebbian Theory: Neurons That Fire Together, Wire TogetherDonald HebbLearning is physical — repeated co-activation between neurons strengthens the connection between them, which is how experience becomes structure.
How to Remember Everything You ReadPolymathinvestorRetention comes from active engagement with material — summarizing in your own words, spacing repetition over time, and connecting new ideas to what you already know — rather than from passive re-reading, which is the most common and least effective study habit.
How to Understand AnythingPolymathinvestorA handful of reusable heuristics — first principles, the Pareto principle, decomposition, structural mapping, and zooming across levels of abstraction — let you build working understanding of almost any complex system from scratch.
How to Use Occam's Razor Without Getting CutFarnam Street (Shane Parrish), after William of OckhamAmong competing explanations that fit the evidence equally well, the one that requires the fewest assumptions should be preferred — but Occam's Razor is a tool for narrowing initial hypotheses, not a substitute for evidence, and misapplying it (assuming 'simple' always beats 'accurate') can mislead badly.
Hyperbolic DiscountingRichard HerrnsteinGiven two similar rewards, humans overwhelmingly prefer the one that arrives sooner. Our brains aggressively 'discount' the value of rewards the further they are in the future.
I Knew It Would Happen: Remembered Probabilities of Once-Future ThingsBaruch Fischhoff & Ruth BeythOnce we know how something turned out, we systematically misremember how predictable it felt beforehand — inflating our recalled certainty to match the now-known outcome, which creates a false sense that events were more foreseeable than they actually were.
Illusion of Transparency: Your Poker Face is Better Than You ThinkFarnam Street (Shane Parrish)We consistently overestimate how visible our internal emotional state is to other people — the 'illusion of transparency' — because we're anchored on our own intense subjective experience, when in reality other people are usually too absorbed in their own concerns to notice.
Inattentional Blindness: The Invisible GorillaDaniel Simons & Christopher ChabrisAttention is not a spotlight that dims the periphery; it is a gate. When you are focused on one task, a fully visible, unexpected event can pass through the middle of your visual field and never reach awareness — and you will be certain you would have seen it.
Influence: The Psychology of PersuasionRobert CialdiniPeople say yes for six predictable, exploitable reasons — reciprocity, commitment, social proof, liking, authority, and scarcity — and knowing the levers is the best defense against having them pulled on you.
Judgment under Uncertainty: Heuristics and Biases (Anchoring)Amos Tversky & Daniel KahnemanWhen estimating an unknown quantity, people rely heavily on the first number they're exposed to, the anchor, and adjust insufficiently away from it — even when that anchor is arbitrary, irrelevant, or explicitly randomly generated.
Judgment under Uncertainty: Heuristics and Biases (Availability)Amos Tversky & Daniel KahnemanPeople estimate how frequent or likely something is by how easily examples come to mind — which means vivid, recent, or heavily-reported events get judged as far more common than they actually are, while common but unremarkable events get systematically underestimated.
Life Is A Mind Game. Here's How You Win.Dan KoeEveryone you think, feel, or do is rooted in survival — physical and psychological — and since your identity is a set of 'memes' (Dawkins's term) trying to persist, deep change is hard because your mind actively defends the identity that change would replace.
Man's Most Dangerous Myth: The Fallacy of RaceAshley MontaguRace, as commonly understood, a set of discrete, biologically fixed categories that determine intelligence, character, or worth, has no basis in human genetics; the boundaries we draw between racial groups are social and historical constructions, not natural biological divisions.
Metacognition and the Hierarchy of ThoughtApertureTrue intellectual autonomy requires ascending a hierarchy of thought, moving beyond the regurgitation of inherited beliefs to achieve metacognition — the capacity to examine and deconstruct the architecture of one's own thinking.
Motivated StoppingEliezer YudkowskyWhen you want to believe something, you stop looking for evidence at the first confirming fact. When you don't want to believe it, you demand impossible proof.
Neuroplasticity: The Brain That Changes ItselfNorman DoidgeThe brain physically rewires itself in response to repeated thought and behavior throughout adulthood, not just childhood — meaning habits, skills, and even chronic thought patterns are more changeable at a neural level than 'fixed personality' framing suggests.
Nine Psychology Concepts Marketers ExploitPierre HerubelMarketing works by triggering nine well-documented cognitive effects — halo effect, loss aversion, social proof, confirmation bias, scarcity, anchoring, goal-gradient, mere-exposure, and authority bias — rather than through rational persuasion about product merit.
Pre-SuasionRobert CialdiniThe most effective persuasion happens before the actual request — by directing someone's attention to the right idea in the moment right before you ask.
Predicting the Future with Bayes' TheoremFarnam Street (Shane Parrish), after Thomas BayesGood judgment under uncertainty means continuously updating your probability estimates as new evidence arrives, weighting that new evidence against what you already knew (your 'priors') rather than either ignoring new evidence or overreacting to it as if nothing else mattered.
Predictive ProcessingAndy ClarkYour brain does not passively receive reality through your eyes and ears. It hallucinates reality, and only uses your senses to correct its errors.
Prospect Theory: An Analysis of Decision under RiskDaniel Kahneman & Amos TverskyLosses and gains of the same objective size are not felt equally — losing a given amount hurts roughly twice as much as gaining the same amount feels good — which systematically distorts decisions under risk away from what a purely rational, outcome-maximizing calculation would recommend.
Russell's Paradox & the Foundations CrisisBertrand RussellRussell showed that naive set theory lets you define 'the set of all sets that don't contain themselves,' which both contains and doesn't contain itself — forcing mathematics to rebuild its foundations with stricter rules.
Second-Order ThinkingHoward MarksFirst-level thinking says 'and then what?' once. Second-level thinking keeps asking.
SludgeCass SunsteinSludge is the evil twin of the Nudge. It is the intentional addition of excessive friction designed to stop you from doing something that benefits you.
SteelmanningEliezer YudkowskyTo truly win an argument or seek truth, you must first construct the absolute strongest, most bulletproof version of your opponent's view before refuting it.
Strong Opinions, Weakly HeldPaul SaffoCommit hard to a view so you can update fast when it's wrong.
Survivorship Bias: The Tale of Forgotten FailuresFarnam Street (Shane Parrish)We systematically overestimate the odds of success because we only see and study the survivors (the Bill Gateses, the Beatles) while the vastly larger number of people who tried the same thing and failed disappear from view entirely — distorting our sense of cause and effect.
The Architecture of Axiomatic BeliefsApertureHuman worldviews are built on a fragile foundation of unexamined axioms — hidden structural beliefs that, if dismantled, cause cascading existential crises and the collapse of personal identity.
The Asymmetry of Cosmic JusticeSleepWiseThe human mind inherently craves narrative balance and karmic fairness, but reality operates on an asymmetric distribution of effort, leverage, and luck, brutally nullifying the illusion of meritocracy.
The Butterfly Effect: How Tiny Actions Unleash Global ConsequencesFarnam Street (Shane Parrish)In complex systems, tiny differences in starting conditions can produce enormous, unpredictable differences in outcome — meaning the butterfly effect is not 'leverage' (a small thing you can reliably push to get a big desired result) but a statement about the fundamental unpredictability of chaotic systems.
The Cynefin FrameworkDave SnowdenYou cannot manage a complex system the same way you manage a complicated one. You must adapt your decision-making to the domain you are in.
The Demon of Reason: Logical FallaciesTED-EdLogical fallacies are structural flaws in an argument's reasoning, independent of whether the conclusion happens to be true — which means an argument can be both persuasive and invalid at the same time, and learning to spot the structure is what protects you from the persuasion.
The Disproportional Power of AnecdotesFarnam Street (Shane Parrish)Anecdotes carry emotional weight far out of proportion to their statistical significance, leading us to overgeneralize from tiny, unrepresentative samples — a bias that shapes everything from personal judgments to public policy built on compelling but non-representative single stories.
The Feynman Technique and the Leitner SystemJosh Sanders (compiling Feynman and Leitner)Genuine understanding is tested by whether you can explain a concept simply enough for a child, and genuine retention is engineered by spacing review intervals according to how well you already know the material — two separate mechanisms that most study habits conflate into one vague 'studying' activity.
The Feynman Technique: The Ultimate Guide to Learning Anything FasterFarnam Street (Shane Parrish), after Richard FeynmanYou don't actually understand something until you can explain it in plain language a 12-year-old could follow — complexity and jargon are usually masking a gap in your own understanding, not evidence of sophistication.
The Filter BubbleEli PariserPariser argued personalized feeds create an invisible, non-consensual filter — you don't choose what you don't see, the algorithm does — so two people can search the same term and inhabit different information worlds without knowing it.
The Generation EffectAnne-Laure Le CunffYou remember information significantly better if you actively generate it from your own mind rather than passively reading it.
The Iceberg ModelEdward T. HallEvents are just the tip of the iceberg. To truly solve a problem, you must look below the surface at the patterns, structures, and mental models driving it.
The Instant Gratification MonkeyTim UrbanProcrastination is a battle between the Rational Decision Maker and the Instant Gratification Monkey, mediated only by the Panic Monster.
The Johari Window and the DiSC ModelJoseph Luft & Harry Ingham (Johari); William Marston (DiSC)Self-awareness and team dynamics can both be mapped with simple two-axis models — the Johari Window splits what's known/unknown to self versus others, while DiSC categorizes behavioral style along dominance and sociability — giving structured vocabulary to traits that otherwise stay vague.
The Law of Large NumbersJacob Bernoulli / Andrey KolmogorovAs you take more independent draws from the same process, the average of what you see converges to the true underlying expectation — which is why small samples routinely mislead and large samples quietly correct.
The Like SwitchJack Schafer & Marvin KarlinsA former FBI behavior analyst argues that likability and rapport follow identifiable, learnable behavioral patterns — friendship signals, similarity, and validation — rather than being a fixed trait some people have and others don't.
The Map is Not the TerritoryAlfred KorzybskiOur mental models of reality are reductions. When the model contradicts reality, the model is wrong, not reality.
The Monty Hall Problem & Conditional ProbabilitySteve Selvin / Marilyn vos SavantSwitching doors in Monty Hall doubles your chance of winning from 1/3 to 2/3 — because the host's action of opening a losing door is not random, it leaks information about where the prize isn't.
The Narrative FallacyNassim Nicholas TalebTaleb argues we compulsively compress noisy, high-variance histories into tidy causal stories — and then mistake the story's coherence for predictive power, hiding randomness where it matters most.
The Pelican Test: Why Every AI Benchmark Eventually DiesSimon WillisonA benchmark that becomes famous enough to matter also becomes a target — and once labs and models start optimizing (deliberately or not) for whatever the benchmark measures, its correlation with real capability quietly decays, even while the benchmark itself keeps getting cited.
The Psychology of Human MisjudgmentCharlie MungerThe human brain relies on roughly two dozen hardwired psychological tendencies that, while evolutionarily useful in isolation, routinely combine to cause catastrophic misjudgment in modern, complex environments.
The Psychology of MoneyMorgan HouselFinancial outcomes are driven far more by behavior, temperament, and the narrow slice of personal history you happened to live through than by intelligence, income, or formal financial knowledge.
The Psychology of Sunk CostHal Arkes & Catherine BlumerPeople irrationally continue investing time, money, or effort into a failing course of action specifically because of what they've already invested — even though that past investment is gone regardless of what they do next, and only future costs and benefits should matter to the decision.
The Small BIGSteve J. Martin, Noah Goldstein & Robert CialdiniSmall, precisely targeted changes to how a request is framed — not bigger incentives or more effort — routinely produce outsized shifts in whether people comply, and each one is backed by a controlled behavioral experiment.
The Storytelling AnimalJonathan GottschallGottschall argues humans are wired for story the way birds are wired for flight — fiction is not escapism but the mind's flight simulator for social life, letting us rehearse intentions and consequences at low cost.
The Value of Probabilistic Thinking: Spies, Crime, and Lightning StrikesFarnam Street (Shane Parrish)Good decisions under uncertainty require three specific probabilistic skills: Bayesian updating (weighing new evidence against prior knowledge), recognizing fat-tailed distributions (where extreme outliers are far more common than a normal bell curve implies), and correcting for asymmetric estimation errors (like investors who systematically overestimate their own returns).
The Zeigarnik EffectBluma ZeigarnikThe human brain remembers uncompleted or interrupted tasks significantly better than completed ones, causing lingering anxiety until the loop is closed.
Thinking, Fast and SlowDaniel KahnemanTwo systems drive human judgment — System 1, fast and intuitive, and System 2, slow and deliberate — and most systematic biases occur when System 1 quietly substitutes an easy question for the hard one actually being asked.
Thought Experiment: How Einstein Solved Difficult ProblemsFarnam Street (Shane Parrish)Thought experiments — structured imaginative scenarios rather than physical tests — let thinkers from Zeno to Einstein explore questions that can't be tested empirically, revealing the logical limits and implications of an idea before (or instead of) any real-world experiment.
Unskilled and Unaware of ItJustin Kruger & David DunningPeople with low competence in a domain tend to overestimate their own ability, because the same skills required to perform well in that domain are also the skills required to accurately judge good performance — so incompetence doubly disadvantages you: it produces poor results and simultaneously removes your ability to recognize that the results are poor.
What Sharks Can Teach Us About Survivorship BiasFarnam Street (Shane Parrish)Our fear of great white sharks — and our comparative indifference to more dangerous species like the oceanic whitetip — is itself a case of survivorship bias: we only hear stories from people who survived an attack and lived to describe it, which skews our sense of what's actually dangerous.

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