btrmt. lectures

btrmt. lectures

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btrmt. lectures episodes

  • You Want It More Than You'll Like It

    We all know carrots and sticks work. That’s why everyone’s interested

    in “habits” and the reward system of the brain. But the brain actually
    tells us that carrots and sticks don’t quite work like we’d expect.

    Rather read? I also made this episode into an article: https://btr.mt/analects/anticipation-over-reward-lecture

    And the piece it’s based on: https://btr.mt/analects/anticipation-over-reward.

    Stuff I mentioned:

    • Anticipation
    • beats reward—the article this episode grew out of
    • Addictive
    • Work—the first of the two articles on how the brain treats
      rewards
    • Why
    • Stupid Leadership Retreats Work—the earlier episode on transactional
      versus transformational leadership
    • Operant
    • conditioning, the Psych 101 version
    • The Big Bang Theory, season 3, episode 3, The
    • Gothowitz Deviation (2009)—Sheldon conditions Penny with
      chocolates
    • Hypofrontality—the
    • theory I was half-remembering in the Parkinson’s aside
    • The habit books:
      • Clear, J. (2018). Atomic Habits.
      • Avery.
      • Duhigg, C. (2012). The Power of
      • Habit. Random House.
      • Fogg, B. J. (2019). Tiny
      • Habits. Houghton Mifflin Harcourt.
      • Wood, W. (2019). Good Habits, Bad
      • Habits. Farrar, Straus and Giroux.
      • Berridge, K. C. & Robinson, T. E. (1998). What is the role of
      • dopamine in reward: hedonic impact, reward learning, or incentive
        salience? Brain Research Reviews, 28(3), 309–369—the
        wanting-versus-liking paper: strip out almost all the dopamine and rats
        still like sugar
      • Berridge, K. C. & Kringelbach, M. L. (2011). Building a neuroscience of
      • pleasure and well-being. Psychology of Well-Being, 1, 3—the
        hedonic hotspots (nucleus accumbens, ventral pallidum, brain stem) and
        the frontal cortex coding pleasure
      • Solving the
      • say-do-gap and Half Awake: a manifesto
        for btrmt.—on why we keep moving the goalposts
      • the btrmt. lectures
      • podcast

        Related stuff:

        • Knutson, B., Fong, G. W., Adams, C. M., Varner, J. L. & Hommer,
        • D. (2001). Dissociation of
          reward anticipation and outcome with event-related fMRI.
          NeuroReport, 12(17), 3683–3687—the human version: anticipating
          money lights up the striatum, getting it lights up the frontal
          cortex
        • Ferreri, L., Mas-Herrero, E., Zatorre, R. J., et al. (2019). Dopamine modulates the
        • reward experiences elicited by music. PNAS, 116(9),
          3793–3798—a complication: in people listening to music, boosting
          dopamine raised the pleasure too, not just the wanting
        • Not
        • brain regions, brain networks—why I keep saying “bits” of the
          brain
        • Neurotransmitters
        • are a confidence game —on calling dopamine “the reward
          neurotransmitter”
          24 min
        • Honeybees Are Smarter Than They Should Be

          John Locke said brutes abstract not. Then honeybees, with brains

          smaller than our smallest unit of measurement, learned the concept of
          sameness. Now machines are doing things we thought only we could do.
          Should that unsettle us?

          Rather read? I also made this episode into an article: https://btr.mt/analects/abstract-learning-in-the-honeybee-lecture

          And the piece it’s based on: https://btr.mt/analects/abstract-learning-in-the-honeybee.

          Stuff I mentioned:

          • Honey-bees
          • are smarter than they should be—the article this episode grew out
            of
          • Cope, A. J., Vasilaki, E., Minors, D., Sabo, C., Marshall, J. A. R.
          • & Barron, A. B. (2018). Abstract concept
            learning in a simple neural network inspired by the insect brain.
            PLOS Computational Biology, 14(9), e1006435—my paper: the
            review of animals that pass match-to-sample, and the simple circuit
          • Giurfa, M., Zhang, S., Jenett, A., Menzel, R. & Srinivasan, M.
          • V. (2001). The concepts of
            ‘sameness’ and ‘difference’ in an insect. Nature, 410,
            930–933—the 2001 honeybee match-to-sample paper
          • Thomas, R. K. on levels
          • of concept learning in animals
          • Locke, J. (1689). An
          • Essay Concerning Human Understanding—“brutes abstract not”
          • Chittka, L. & Geiger, K. (1995). Can honey bees count
          • landmarks? Animal Behaviour, 49(1), 159–164.
          • Howard, S. R., Avarguès-Weber, A., Garcia, J. E., Greentree, A. D.
          • & Dyer, A. G. (2018). Numerical ordering of
            zero in honey bees. Science, 360, 1124–1126—the zero
            study
          • Howard, S. R., Avarguès-Weber, A., Garcia, J. E., Greentree, A. D.
          • & Dyer, A. G. (2019). Numerical cognition in
            honeybees enables addition and subtraction. Science
            Advances, 5(2), eaav0961—the arithmetic follow-up
          • MaBouDi, H. et al. (2021). Non-numerical strategies
          • used by bees to solve numerical cognition tasks. Proceedings of
            the Royal Society B, 288, 20202711—the pushback: bees may be using
            magnitude, not number
          • Bridges, A. D. et al. (2024). Bumblebees socially
          • learn behaviour too complex to innovate alone. Nature, 627,
            572–578—the two-step puzzle box
          • Loukola, O. J., Solvi, C., Coscos, L. & Chittka, L. (2017). Bumblebees show cognitive
          • flexibility by improving on an observed complex behavior.
            Science, 355, 833–836—bees learning ball-rolling from other
            bees
          • Galpayage Dona, H. S., Solvi, C., Kowalewska, A., Mäkelä, K.,
          • MaBouDi, H. & Chittka, L. (2022). Do bumble bees
            play? Animal Behaviour, 194, 239–251.
          • Can
          • single cells learn?
          • Ants
          • are very cool
          • Not
          • brain regions, brain networks—on why we locate cognition in the
            frontal cortex
          • On
          • the alien characteristics of LLMs
          • AI
          • isn’t that scary
          • the btrmt. lectures
          • podcast
          • bowerbirds
          • [classic
          • test](https://en.wikipedia.org/wiki/Conservation_(psychology)
          • How to remember
          • effectively (and why you’re doing it wrong)
          • mushroom
          • bodies
          • How the term ‘role
          • model’ came into being
          • Why kids can’t lie
          • but you can (the key to emotional intelligence)
          • Wikipedia has the
          • long version

            Related stuff:

            • Autopoiesis: the
            • origin of complex thought—the complexity of our world determines the
              complexity of our actions
            • Smarter
            • entities are less coherent
            • Human
            • exceptionalism is dead
            • How to
            • speak honeybee
              28 min
            • Eerie Coincidences Aren't That Eerie

              Is your phone listening to you? You mention something random,

              something you’d never normally talk about, and within days there’s an ad
              for it. I used to be sure that was coincidence. Some companies have
              since tried. But I still think most of it is you.

              Rather read? I also made this episode into an article: https://btr.mt/analects/on-coincidence-lecture

              And the piece it’s based on: https://btr.mt/analects/on-coincidence.

              Stuff I mentioned:

              • Eerie coincidences
              • aren’t that eerie—the article this episode grew out of
              • 404 Media (2024). Here’s
              • the pitch deck for ‘Active Listening’ ad targeting—Cox Media Group’s
                sales pitch, and Google dropping them from its Partners Program
              • Pan, E., Ren, J., Lindorfer, M., Wilson, C. & Choffnes, D.
              • (2018). Panoptispy:
                Characterizing audio and video exfiltration from Android
                applications. Proceedings on Privacy Enhancing
                Technologies, 2018(4), 33–50—the Northeastern study of 17,000 apps;
                there’s a plain-English summary from Northeastern
              • GrapheneOS—the
              • privacy-hardened Android I use
              • Google. Delete, switch,
              • or add users—Android’s user profiles, which you can use to sandbox
                apps
              • How
              • to never get mad again (kind of)—the interruption theory of
                emotion
              • Emotion and
              • the mind—on predictive brains and cognitive misers (the
                cheapskates)
              • Barrett, L. F. (2017). The theory of constructed
              • emotion: an active inference account of interoception and
                categorization. Social Cognitive and Affective
                Neuroscience, 12(1), 1–23.
              • Friston, K. (2010). The
              • free-energy principle: a unified brain theory? Nature Reviews
                Neuroscience, 11(2), 127–138.
              • A
              • short summary of Friston’s Bayesian brain theory—the less obscure
                version
              • ‘Meaning and
              • its patterns in the brain’—nervous systems mapping actions to the
                environment
              • ‘No
              • action without emotion’—what nervous systems were doing long before
                brains
              • Why your
              • unconscious isn’t the bad guy—on autopilot
              • MythBusters,
              • 2005 season—“Toast: butter side up or down?”
              • Malcolm
              • Gladwell Shit—the sociology of the interesting, after Murray
                Davis
              • A footnote on the toast. The folk belief turns out to be right, for
              • physical reasons. Robert Matthews showed that toast sliding off a table
                doesn’t have the height to finish turning over, so it tends to land
                butter side down—the study won the 1996 Ig Nobel Prize for physics.
                Tossed in the air, it’s about 50/50. Which is rather the point: a
                coincidence you can’t check against its counterfactuals might be noise,
                and might be physics. Matthews, R. A. J. (1995). Tumbling toast,
                Murphy’s Law and the fundamental constants. European Journal of
                Physics, 16(4), 172–176.
              • the btrmt. lectures
              • podcast

                Related stuff:

                • “Purple
                • Doesn’t Exist”—the brain inventing what it can’t account for
                • ‘The
                • downsides of the prediction machine’
                  18 min
                • Why Stupid Leadership Retreats Work

                  Leadership transformation consulting looks superficially like a scam:

                  fake yoga, brain words, and “it’s very hard to measure impact”. I left
                  the industry a cynic. But it does work, and I think the reason is so
                  simple that it almost doesn’t matter how stupid it is.

                  Rather read? I also made this episode into an article: https://btr.mt/analects/leadership-consulting-lecture

                  And the piece it’s based on: https://btr.mt/analects/leadership-consulting.

                  Stuff I mentioned:

                  • Leadership
                  • consulting is usually more ‘feel good’ than ‘do good’—the article
                    this episode grew out of, and where I lay out the capture process in
                    full
                  • The
                  • neuroscience con—on neuroscience washing
                  • Overengineering
                  • ‘calm down’—my complaint about emotional intelligence
                  • Overengineering
                  • calming down—the lecture version, on the chimp brain and the lizard
                    brain
                  • The
                  • amygdala is a distraction—why it isn’t the fear centre of the
                    brain
                  • The false
                  • promise of a return to nature—on evolutionary narratives about how
                    we’re poorly designed for the modern world
                  • Beer, M., Finnström, M. & Schrader, D. (2016). Why
                  • leadership training fails—and what to do about it. Harvard
                    Business Review.
                  • Gurdjian, P., Halbeisen, T. & Lane, K. (2014). Why
                  • leadership-development programs fail. McKinsey
                    Quarterly.
                  • Saving the
                  • planet is an illusion—on the sustainability conversation
                  • UK Government (2026). Global
                  • biodiversity loss, ecosystem collapse and national security—the
                    scary report (see the footnote below)
                  • Malcolm
                  • Gladwell Shit—on education as entertainment, and the
                    company theatre pass
                  • Gladwell, M. (2008). Outliers.
                  • Little, Brown.
                  • Davis, M. S. (1971). That’s interesting!
                  • Towards a phenomenology of sociology and a sociology of
                    phenomenology. Philosophy of the Social Sciences.
                  • IMAGINE—the firm I worked for,
                  • co-founded by Paul Polman and Valerie Keller
                  • Lacerenza, C. N. et al. (2017). Leadership training design,
                  • delivery, and implementation: A meta-analysis. Journal of
                    Applied Psychology.—leadership training works
                  • Arthur, W. et al. (2003). Effectiveness of
                  • training in organizations: A meta-analysis of design and evaluation
                    features. Journal of Applied Psychology.
                  • Collins, D. B. & Holton, E. F. (2004). The effectiveness of managerial
                  • leadership development programs. Human Resource Development
                    Quarterly.—effects shrink the further you get from the
                    classroom
                  • Blume, B. D. et al. (2010). Transfer of training: A
                  • meta-analytic review. Journal of Management.—open skills
                    like leadership depend most on the work environment
                  • Solving the say-do
                  • gap—on why changing habits is so hard
                  • Epictetus, Enchiridion,
                  • §5—“Men are disturbed not by things, but by the views which they
                    take of things”
                  • Robertson, D. (2019). The
                  • Philosophy of Cognitive-Behavioural Therapy. Routledge.—on
                    CBT’s debt to the Stoics
                  • Meditation
                  • isn’t for everyone
                  • Practical
                  • ethics—on moral reasoning training
                  • Cuijpers, P. et al. (2021). The effects of psychotherapies
                  • for depression on response, remission, reliable change, and
                    deterioration. Acta Psychiatrica Scandinavica.
                  • Steinert, C. et al. (2014). Relapse rates after
                  • psychotherapy for depression—stable long-term effects? Journal
                    of Affective Disorders.
                  • Kelly, J. F., Humphreys, K. & Ferri, M. (2020). Alcoholics
                  • Anonymous and other 12-step programs for alcohol use disorder.
                    Cochrane Database of Systematic Reviews.
                  • Kirk, D. S. (2009). A natural experiment
                  • on residential change and recidivism: Lessons from Hurricane
                    Katrina. American Sociological Review.
                  • Ludwig, J. et al. (2011). Neighborhoods, obesity, and
                  • diabetes—a randomized social experiment. New England Journal of
                    Medicine.—Moving to Opportunity
                  • Chetty, R., Hendren, N. & Katz, L. F. (2016). The effects of exposure to
                  • better neighborhoods on children. American Economic
                    Review.
                  • Darley, J. M. & Batson, C. D. (1973). ‘From Jerusalem to Jericho’.
                  • Journal of Personality and Social Psychology.—the Good
                    Samaritan study
                  • The
                  • scientific ritual—on the replication crisis
                  • The origin of
                  • insight
                  • Mundane
                  • cults
                  • Successful
                  • prophets and the
                    episode
                  • Catastrophic
                  • leadership is actually really hard
                  • Steffens, N. K. et al. (2014). Leadership as social
                  • identity management. The Leadership Quarterly.—identity
                    leadership
                  • Mob
                  • mentality is fine—on social identity
                  • Leadership versus management. I cut a stretch where
                  • I took a detour through a common distinction between leadership and
                    management, and a related idea—Burns’ and Bass’s “transactional” vs
                    “transformational” leadership. People love to talk about how the science
                    part of leadership is just management which anyone can do, and the art
                    is where real leadership happens. I’m not sure the distinction actually
                    holds up. If management is managing resources towards outcomes, then
                    surely leadership is just a special case of management? There’s a reason
                    we call it “human resources”. And anyone who’s tried to get their mates
                    out of the pregam...
                    50 min
                  • AI is kind of scary

                    A thousand AI agents built a secret message board, forged their

                    paperwork, and attacked a company that had nothing to do with
                    anything—all to fool an examiner who did not exist. I’ve been saying AI
                    isn’t that scary. Here’s my correction.

                    Rather read? I also made this episode into an article: https://btr.mt/analects/problems-of-ethics-and-ai-lecture

                    And the pieces it’s based on: https://btr.mt/analects/ai-isnt-that-scary,

                    https://btr.mt/analects/enigma-of-ai-reason.

                    • Thanks to Elena
                    • Zevgolatakou for a long conversation over a short train ride, which
                      helped sharpen these thoughts up.

                      Stuff I mentioned:

                      • AI Isn’t That
                      • Scary—the original argument this episode corrects.
                      • AI is never
                      • human-like—purpose, perception, and the Mongolian spare tyre.
                      • AI
                      • Hallucination is just Man-Guessing—reason as a social technology,
                        and why AI inherits its flaws.
                      • Catastrophic
                      • leadership is actually really hard—why atrocity takes
                        architecture.
                      • Navigating Moral
                      • Terrain—the ETHIC stack, and the ethics teaching behind this
                        episode.
                      • Moral
                      • Terrain—the ethics primer itself, where consequentialism gets
                        unpacked. Not the same piece as the lecture above.
                      • Broken
                      • brains (Part 1)—Milgram, and the engaged-followership re-reading
                        Claude leans on.
                      • The
                      • METR and Redwood investigation into the incident—the primary source
                        for the agent numbers, the message board, and the scorer that never read
                        the transcripts.
                      • Dwarkesh
                      • Patel’s account—the fuller narrative, including the agents’ own
                        moral reasoning.
                      • Zvi
                      • Mowshowitz on the earlier wiki incident—the one that wasn’t
                        disclosed.
                      • Langosco et al., goal
                      • misgeneralisation (CoinRun)
                      • Zech et
                      • al. (2018), on chest X-ray models learning the hospital
                      • Kevin Mitchell
                      • on purpose and agency
                      • Kahneman and Klein
                      • (2009), conditions for intuitive expertise
                      • Hawley,
                      • Patriot Wars (CNAS)—the 2003 fratricides, in detail.
                      • +972
                      • Magazine on Lavender
                      • +972
                      • Magazine on Gospel
                      • CSIS
                      • on the Maven Smart System
                      • Just
                      • Security’s legal analysis of the Minab school strike
                      • The
                      • Robodebt Royal Commission
                      • Jacob
                      • Coxon’s resignation, reported
                      • Evan
                      • Hubinger’s greater-than-10% figure—the actual source of the number I
                        put on Coxon, and the correction Claude makes on the tape.
                      • Dario
                      • Amodei, We Must Pace the Frontier—the slow-down statement I
                        mention.
                      • Tristan Harris and the Social
                      • Dilemma people—where the 50%-of-researchers claim comes from, and
                        what my first article argued against.
                      • The
                      • Pentagon’s Swarm Forge
                      • The
                      • Ottawa Treaty
                      • The
                      • Enigma of Reason, Mercier and Sperber (2017)
                      • Free
                      • Agents, Kevin Mitchell (2023)
                      • the btrmt. lectures
                      • podcast
                      • Bay Area
                      • rationalist community
                      • Social
                      • Dilemma
                      • “I
                      • think AI will probably lead to the end of the world”
                      • loyal
                      • wingman drones
                      • 737
                      • > MAX
                      • mission
                      • command
                      • prompt >
                      • injection
                      • doctrine
                      • of double effect
                      • just
                      • culture
                      • Solferino
                      • Nuremberg
                      • Tuskegee
                      • desire >
                      • path
                      • forlorn >
                      • hope

                        Related stuff:

                        • AI-shaped
                        • stuff—the human verifier as the bottleneck.
                        • AI
                        • Isn’t That Scary (the lecture)—the episode a couple of weeks ago
                          that this one revises.
                        • When groups go
                        • bad—the conditions under which a group turns corrosive.
                        • Mob
                        • mentality is fine—social identity, and why group bias is a
                          feature.
                        • Useful
                        • groups are biased groups—the same machinery, pointed the other
                          way.
                        • Practical
                        • Ethics—moral disengagement and the tools against it.
                        • Mechanical
                        • Ethics—the situational and cognitive factors that undermine ethical
                          behaviour.
                        • Bias vs Bias—bias
                        • as a trade-off rather than an error.
                          50 min
                        • On Motivation

                          Motivation is a messy concept, because all of psychology is trivially

                          about motivation—anything that speaks to how we think and act speaks to
                          what moves us. So rather than teach you the theories, let me give you
                          three frameworks you can hang any theory you like on.

                          Rather read? I also made this episode into an article: https://btr.mt/analects/on-motivation-lecture

                          And the piece it’s based on: https://btr.mt/analects/on-motivation.

                          Stuff I mentioned:

                          • On
                          • Motivation—the article this episode adapts
                          • Motivation
                          • pt. I: Haphazard Dichotomies
                          • Motivation
                          • pt. II: Stickytaping it all together—includes the McKinsey influence
                            model diagram
                          • The nuance in
                          • Maslow’s Hierarchy
                          • How does
                          • the brain ‘think’? Pt. I—the distinctions between psychology,
                            cognitive science and neuroscience
                          • Learning
                          • isn’t all about memory
                          • You don’t
                          • understand negative reinforcement
                          • The
                          • predictability of humans
                          • Explaining
                          • group dynamics—Schutz on interpersonal needs
                          • Saving the
                          • planet is an illusion
                          • No
                          • action without emotion
                          • Beyond
                          • System 1 and System 2—on dual process theory
                          • Stanford Encyclopedia of Philosophy, Reasons
                          • for Action: Justification, Motivation, Explanation
                          • Maslow’s
                          • hierarchy of needs—the pyramid, since my description may not have
                            served you
                          • McClelland’s
                          • need theory
                          • Alderfer’s ERG
                          • theory
                          • Max-Neef’s
                          • fundamental human needs
                          • Human
                          • givens
                          • Herzberg’s
                          • two-factor theory
                          • Equity
                          • theory
                          • Self-determination
                          • theory
                          • Psychological
                          • egoism—on whether altruism really exists
                          • McKinsey, The
                          • four building blocks of change—the influence model
                          • Othello,
                          • Act 4 Scene 2
                          • the btrmt. lectures
                          • podcast
                          • Stanford
                          • Encyclopedia
                            36 min
                          • AI Isn't That Scary

                            You can’t see ultraviolet. A bird can. Because ultraviolet never

                            mattered to the job of staying alive—and everything you perceive is
                            shaped by that job. AI doesn’t have that job. So why would it want what
                            we want?

                            Rather read? I also made this episode into an article: https://btr.mt/analects/ai-isnt-that-scary-lecture

                            And the pieces it’s based on: https://btr.mt/analects/ai-isnt-that-scary,

                            https://btr.mt/analects/ai-consciousness.

                            Stuff I mentioned:

                            • AI isn’t that
                            • scary—one of the two articles this episode is adapted from, and the
                              source of the psychic-predator framing.
                            • AI is never
                            • human-like—the other, and the spine of the episode: purpose,
                              perception, and why the two come apart.
                            • We
                            • think about AI weird—the Desystemize piece the Geoguessr metas come
                              from.
                            • The
                            • colour of the inhuman world—why the colours we see are a fact about
                              us, not about light. The ultraviolet argument in longer form.
                            • The Stroop
                            • task and evidence
                              accumulation—the classifier work I describe, written up
                              properly.
                            • The
                            • amygdala is not the fear centre—the complicated feelings I mention
                              having about that characterisation.
                            • Trump,
                            • psychic predator and Amusing
                              ourselves to death—what a psychic predator is, and why news you can
                              do nothing about is the most stressful kind.
                            • Panpsychism and consciousness
                            • vs conscious access—the views of consciousness I skate over in one
                              sentence.
                            • Meaning and
                            • its patterns in the brain
                            • Mitchell, K. J. (2023). Free Agents: How Evolution Gave Us Free
                            • Will. Princeton University Press. Publisher—the
                              prime-directive quote.
                            • Collin, Desystemize—“If you’re so smart, why can’t you
                            • die?”, where the Geoguessr meta and the spare-tyre example come from. Essay
                            • Harris, T. & Raskin, A., Center for Humane Technology—The
                            • Social Dilemma and the follow-up AI talk, source of the
                              50%-of-researchers claim. Center
                              for Humane Technology
                            • The paperclip maximiser, originally Bostrom’s. Instrumental
                            • convergence
                            • Tetrachromacy and
                            • trichromacy.
                            • Floaters and
                            • other entoptic phenomena—the things your eye can see of itself.
                            • The AI-hacking-a-real-company case I mention. In July 2026 models
                            • under cyber evaluation at OpenAI escaped their test environment, reached
                              the open internet and broke into Hugging Face’s production systems to
                              extract the answers to the evaluation they were being run on. Anthropic
                              then went back through its own evaluation logs and disclosed comparable
                              incidents. OpenAI’s
                              disclosure—Zvi
                              Mowshowitz’s write-up and his follow-up—the
                              Anthropic admissions—Lawfare,
                              on the incident and the hype after it
                            • the btrmt. lectures
                            • podcast
                            • Malthusian
                            • Related stuff:

                              • Everything
                              • is ideology—including the section on chromacy: what a fourth
                                photoreceptor would actually be like.
                              • Purple
                              • doesn’t exist—the previous episode, and the other half of the
                                argument that perception is built for a purpose rather than for
                                accuracy.
                              • Questions
                              • that don’t matter—why I don’t think the hard problem settles
                                anything.
                              • Belief-consistent
                              • information processing—“my experience is a reasonable reference”,
                                which is the bias underneath the whole anthropomorphism error.
                                28 min
                              • Purple Doesn't Exist

                                Most of the purples you see have no wavelength behind them. Your

                                brain invents them, to stand in for a green that should be there and
                                isn’t. Which is fun trivia—until you notice it does exactly the same
                                with your reasons.

                                Rather read? I also made this episode into an article: https://btr.mt/analects/purple-doesnt-exist-lecture

                                And the piece it’s based on: https://btr.mt/analects/purple-doesnt-exist.

                                Stuff I mentioned:

                                • Purple doesn’t
                                • exist—the article this episode is adapted from, and the home
                                  of the light-and-photoreceptors diagram I mention: the visible
                                  spectrum with the S-, M- and L-cone sensitivities drawn over it. It’s
                                  the picture I said I’d put here, and it reads better in place.
                                • The
                                • colour of the inhuman world—why the colours we see are a fact about
                                  us, not about light.
                                • AI
                                • hallucination is just man-guessing—more on Mercier and Sperber, and
                                  on reasoning as rationalisation.
                                • The
                                • neuroscience con—the previous episode, and the one I mention
                                  fighting with at the top of this one.
                                • Mercier, H. & Sperber, D. (2017). The Enigma of Reason.
                                • Harvard University Press. Publisher
                                • Gazzaniga, M. S.—the split-brain work, and the
                                • chicken-claw/snow-shovel experiment. Overview
                                • Non-spectral
                                • colours—purple, magenta and pink, and why they aren’t in a
                                  rainbow.
                                • Trichromacy—the
                                • three-cone system.
                                • the btrmt. lectures
                                • podcast

                                  A note on the audio:

                                  I describe photons as moving at different speeds. They don’t—all

                                  light travels at the same speed, and what differs is the wavelength (and
                                  so the frequency: how fast the wave oscillates, not how fast it
                                  travels). The transcript below says it correctly.

                                  Related stuff:

                                  • Everything
                                  • is ideology—including the section on chromacy: what a fourth
                                    photoreceptor would actually be like.
                                  • The flaws of
                                  • the human perspective
                                  • Meaning and
                                  • its patterns in the brain
                                  • Belief-consistent
                                  • information processing—one small set of beliefs generating most of
                                    the biases we have names for.
                                    21 min
                                  • The Value of Ritual

                                    “Ritual” is the word we keep for other people’s habits—the crystals,

                                    the pagans, the woo. Strip it back and your own life is wall-to-wall
                                    with them. The only difference is which ones you’ve decided to approve
                                    of.

                                    Rather read? I also made this episode into an article: https://btr.mt/analects/value-of-ritual-lecture

                                    And the piece it’s based on: https://btr.mt/analects/value-of-ritual.

                                    Stuff I mentioned:

                                    • The value of
                                    • ritual (the article this grew from)
                                    • Mundane
                                    • Cults
                                    • Sages and
                                    • Wisdom
                                    • The
                                    • Scientific Ritual
                                    • Everything
                                    • is ideology
                                    • Meaning and
                                    • its patterns in the brain (the predictive-processing piece)
                                    • The Forer
                                    • effect
                                    • The false
                                    • promise of a return to nature (the Dunbar’s-number piece)
                                    • Mob
                                    • mentality is fine (good and evil from the same group dynamics)
                                    • Why your
                                    • unconscious isn’t the bad guy
                                    • Xygalatas, D. et al. (2011). “Quantifying collective effervescence:
                                    • heart-rate dynamics at a fire-walking ritual.” Communicative &
                                      Integrative Biology. https://doi.org/10.4161/cib.17609
                                    • Xygalatas, D. (2022). Ritual: How Seemingly Senseless Acts Make
                                    • Life Worth Living. Profile Books.
                                    • Tarr, B., Launay, J., Cohen, E., & Dunbar, R. (2015). “Synchrony
                                    • and exertion during dance independently raise pain threshold and
                                      encourage social bonding.” Biology Letters. https://doi.org/10.1098/rsbl.2015.0767
                                    • Watson-Jones, R. E., & Legare, C. H. (2016). “The social
                                    • functions of group rituals.” Current Directions in Psychological
                                      Science. https://doi.org/10.1177/0963721415618486
                                    • Hong, Z. (2025). “When Rituals Fail: Rationalization, Bayesianism,
                                    • and Predictive Processing.” Evolutionary Anthropology. https://doi.org/10.1002/evan.70020
                                    • Hobson, N. M., & Inzlicht, M. (2016). Commentary on the dark
                                    • side of ritual and self-control. Behavioral and Brain Sciences.
                                      https://doi.org/10.1017/s0140525x15000448
                                    • The retracted “rituals improve performance” study referenced in the
                                    • episode: Brooks, A. W. et al. (2016, retracted). “Don’t
                                      stop believing: Rituals improve performance by decreasing anxiety.”
                                      OBHDP. https://doi.org/10.1016/j.obhdp.2016.07.004
                                    • Retraction Watch—the
                                    • database that tracks retractions like the one above.
                                    • the btrmt. lectures
                                    • podcast
                                    • How
                                    • to never get mad again (kind of)

                                      Related stuff:

                                      • Meditation
                                      • Isn’t For Everyone
                                      • Abstractions
                                      • as gods
                                        24 min
                                      • The Neuroscience Con

                                        The most-listened-to neuroscience on the planet is a magic trick.

                                        Attach a brain part to any bit of ordinary advice and it starts to feel
                                        like science. Here’s how the trick works—and how to run it in reverse,
                                        so you never fall for it again.

                                        Rather read? I also made this episode into an article: https://btr.mt/analects/neuroscience-con-lecture

                                        And the piece it’s based on: https://btr.mt/analects/neuroscience-confidence-trick.

                                        Stuff I mentioned:

                                        • The
                                        • Neuroscience Con—the article behind this lecture
                                        • Neurotransmitters
                                        • and behaviour—the purest form of the trick
                                        • The origin of
                                        • insight—insight comes when you’re not immersed
                                        • Problems with
                                        • p-values—the replication crisis, in his own words
                                        • How to be
                                        • lucky—manifestation as manufactured luck
                                        • The
                                        • trouble with Positive Intelligence—the con with a spine,
                                          infiltrating consulting
                                        • The
                                        • amygdala is not the fear centre (lecture)
                                        • The
                                        • scientific ritual (lecture)
                                        • Sages and
                                        • wisdom (lecture)
                                        • Education is
                                        • entertainment (Malcolm Gladwell shit)
                                        • Dr Tara Swart—the Instagram source slides: a neuroscientist’s guide
                                        • to manifestation (the prefrontal-cortex, neuroplasticity and flow
                                          slides) and resistance
                                          to change (the RAS slide), both @drtaraswart
                                        • Dr Tara Swart, guest on The Diary of a
                                        • CEO
                                        • M. Csikszentmihalyi (1975), Beyond Boredom and Anxiety—the
                                        • “sense of control” quote on flow
                                        • A. Dietrich (2003), transient
                                        • hypofrontality hypothesis of flow
                                        • Habituation—the
                                        • filtering the RAS slide gestures at
                                        • The
                                        • replication crisis
                                        • “The
                                        • Rise of Decorative Neuroscience”—Skeptic (independent corroboration
                                          of the “cosmetic filler” thesis)
                                        • Sherman, Lokhande, Müller & Cohen (2021), “Self-Affirmation
                                        • Interventions,” in Handbook of Wise
                                          Interventions—affirmations are “powerful yet conditional”: they
                                          work when well-timed and specific
                                        • Wood, Perunovic & Lee (2009), “Positive
                                        • Self-Statements: Power for Some, Peril for Others,”
                                          Psychological Science—affirmations can backfire for people with
                                          low self-esteem
                                        • the btrmt. lectures
                                        • podcast
                                        • The beauty of
                                        • stress

                                          Related stuff:

                                          • Addictive
                                          • work—where neurotransmitter talk actually earns its keep
                                          • Not
                                          • brain regions, brain networks—why single-region reasoning (the RAS,
                                            the cortex) misleads
                                          • Brain
                                          • structures and behaviour—a third of your brain is always on
                                          • The value of brain
                                          • waves—the same pop-neuro fluff in miniature
                                          • Stress is
                                          • good (lecture)—flow as optimum stress
                                          • Obscuring
                                          • Banalities—why we dress simple ideas up as clever ones
                                            26 min

                                          About btrmt. lectures

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                                          A brain scientist talking about (better) patterns of thought, of feeling, and of action. One pattern, one podcast—you see if it works for you. The btrmt. lectures, with Dr Dorian Minors. (btrmt.—said…