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Bayesian reasoning (27)
study critique (270)
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study critique (270)
book review (221)
AI (112)
economics (105)
effective altruism (105)
education (93)
creative writing (91)
debate (89)
forecasting (89)
politics (89)
prediction markets (88)
science (85)
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media criticism (76)
neuroscience (76)
rationality (76)
psychiatry (73)
psychology (72)
mental health (69)
highlights from the comments (68)
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domain: slatestarcodex.com (1127 posts)
domain: wikipedia.org (896 posts)
domain: astralcodexten.com (560 posts)
domain: lesswrong.com (491 posts)
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27 posts
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Why I'm Staying Out Of The Substack Religion Debate

Scott explains why he's not interested in participating in the current wave of God debates on Substack, arguing that religious explanations fall into the same category as conspiracy theories by invoking "powerful hidden entities" to explain anomalies.

acx
Aug 19, 2026 3,639 words 446 likes 842 comments Listen · 21 min Read Read

Highlights From The Comments On Fatima

Scott explores reader responses to his Fatima miracle post, finding the most promising explanation in Buddhist fire kasina meditation practices that produce similar visual phenomena, while remaining uncertain about how 70,000 untrained people could achieve advanced meditative states instantly.

acx
Oct 24, 2025 22,516 words 160 likes 366 comments Listen · 119 min Read Read

Bayes For Everyone

Brandon Hendrickson presents a method to teach Bayes' theorem effectively to everyone by making it visual, intuitive, emotionally engaging, and a tool for rational discourse.

acx
May 30, 2025 4,864 words 244 likes 199 comments Listen · 30 min Read Read

Practically-A-Book Review: Rootclaim $100,000 Lab Leak Debate

Scott Alexander reviews a $100,000 debate on COVID-19 origins, where the zoonotic hypothesis unexpectedly won against the lab leak theory.

acx
Mar 28, 2024 18,207 words 369 likes 905 comments Listen · 95 min Read Read

Against Learning From Dramatic Events

Scott Alexander argues against significantly updating beliefs based on single dramatic events, advocating for consistent policies based on pre-existing probability distributions.

acx
Jan 16, 2024 3,919 words 309 likes 576 comments Listen · 21 min Read Read

Addendum To "No Evidence" Post

Scott provides a real-world example of how the phrase 'no evidence' can be misused in science reporting, contrasting it with a prediction market's more nuanced response.

acx
Dec 23, 2021 214 words 88 likes 75 comments Listen · 4 min Read Read

The Phrase "No Evidence" Is A Red Flag For Bad Science Communication

Scott Alexander criticizes the misleading use of 'no evidence' in science communication and suggests more nuanced alternatives.

acx
Dec 17, 2021 1,478 words 400 likes 491 comments Listen · 14 min Read Read

Toward A Bayesian Theory Of Willpower

Scott Alexander proposes a Bayesian theory of willpower as a process of weighing evidence from different mental processes to determine actions.

acx
Mar 26, 2021 1,995 words 146 likes 399 comments Listen · 15 min Read Read

Trapped Priors As A Basic Problem Of Rationality

Scott Alexander explores the concept of 'trapped priors' as a fundamental problem in rationality, explaining how it leads to persistent biases and suggesting potential solutions.

acx
Mar 10, 2021 5,057 words 379 likes 641 comments Listen · 30 min Read Read

Confirmation Bias As Misfire Of Normal Bayesian Reasoning

Scott Alexander proposes that confirmation bias might be a misapplication of normal Bayesian reasoning rather than a separate cognitive phenomenon.

ssc
Feb 12, 2020 531 words 0 likes 115 comments Listen · 6 min Read Read

Building Intuitions On Non-Empirical Arguments In Science

Scott Alexander argues that non-empirical reasoning, based on principles like simplicity and elegance, is a necessary and legitimate part of scientific practice, even for evaluating seemingly untestable theories.

ssc
Nov 6, 2019 3,505 words 0 likes 438 comments Listen · 27 min Read Read

Highlights From The Comments On PNSE

Scott Alexander examines skeptical and supportive comments on claims of enlightenment, arguing that evidence for such states is comparable to other accepted mental phenomena.

ssc
Oct 24, 2019 3,097 words 0 likes 165 comments Listen · 22 min Read Read

SSC Journal Club: Relaxed Beliefs Under Psychedelics And The Anarchic Brain

Scott reviews a paper proposing that psychedelics work by relaxing priors in the brain, potentially treating mental illness but also risking side effects.

ssc
Sep 10, 2019 2,690 words 0 likes 97 comments Listen · 22 min Read Read

Translating Predictive Coding Into Perceptual Control

Scott Alexander argues that Free Energy/Predictive Coding and Perceptual Control Theory are fundamentally the same, and proposes using PCT's more intuitive terminology to help understand FE/PC.

ssc
Mar 20, 2019 1,386 words 0 likes 103 comments Listen · 11 min Read Read

Paradigms All The Way Down

Scott Alexander presents a 'Grand Unified Chart' showing how different domains of knowledge share a similar structure in interpreting the world, arguing this is due to basic brain algorithms and effective epistemology.

ssc
Jan 10, 2019 650 words 0 likes 58 comments Listen · 7 min Read Read

How Do We Get Breasts Out Of Bayes Theorem?

Scott Alexander examines the conflict between predictive processing theory and evolutionary psychology claims about innate knowledge, questioning how genes could directly encode complex preferences.

ssc
Sep 7, 2017 1,089 words 0 likes 313 comments Read Read

Heuristics Work Until They Don’t

Scott Alexander warns against forming strong heuristics based on limited data, using examples from AI research, elections, and campaign strategies to illustrate the pitfalls of this approach.

ssc
Jan 11, 2017 1,067 words 0 likes 350 comments Read Read

It’s Bayes All The Way Up

The post explores how Bayesian processes in the brain might explain perception and various mental disorders, linking neurotransmitters to different aspects of Bayesian reasoning.

ssc
Sep 12, 2016 3,871 words 0 likes 215 comments Read Read

If You Can’t Make Predictions, You’re Still In A Crisis

Scott Alexander argues that psychology is indeed in crisis, contrary to a New York Times article's claim, due to issues like publication bias and low replication rates.

ssc
Sep 5, 2015 1,866 words 0 likes 318 comments Read Read

Contra Hallquist On Scientific Rationality

Scott Alexander defends Less Wrong and Eliezer Yudkowsky against accusations of being anti-scientific, arguing that developing rational thinking skills beyond traditional scientific methods is valuable and necessary.

ssc
Aug 4, 2015 10,781 words 0 likes 679 comments Read Read

Statistical Literacy Among Doctors Now Lower Than Chance

Scott Alexander analyzes a study revealing poor statistical literacy among doctors, critiquing both the study and its implications for medical decision-making.

ssc
Dec 17, 2013 1,019 words 0 likes 36 comments Read Read

Bayes for Schizophrenics: Reasoning in Delusional Disorders

Scott examines neurological theories explaining delusions like Capgras syndrome through Bayesian reasoning, arguing that damage to the right prefrontal cortex causes patients to ignore priors and base their beliefs solely on explanatory adequacy.

lw
Aug 13, 2012 3,339 words 155 likes 155 comments Read Read

Nonmindkilling open questions

Scott asks readers for examples of popular, important, factual questions with high uncertainty and no clear 'responsible' position, to use when teaching probabilistic thinking, noting that his previous examples like global warming have become too polarized.

lw
Mar 23, 2012 363 words 32 likes 113 comments Read Read

Reversed stupidity sometimes provides useful information

Scott argues against Eliezer's position that reversed stupidity is never intelligence, showing that observing many people believe something for bad reasons can help identify 'popular claims' that people assert regardless of truth, which lets you properly discount future assertions of those claims.

lw
Sep 28, 2011 864 words 25 likes 13 comments Read Read

Confidence levels inside and outside an argument

Scott distinguishes between an argument's internal confidence level and our external confidence in that argument, showing that extremely high probability claims should be moderated by the baseline probability that the argument itself is flawed.

lw
Dec 16, 2010 1,981 words 248 likes 192 comments Read Read
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