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Many Minds

Many Minds

Di: Kensy Cooperrider – Diverse Intelligences Summer Institute
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Our world is brimming with beings—human, animal, and artificial. We explore how they think, sense, feel, and learn. Conversations and more, every two weeks.Diverse Intelligences Summer Institute 2020-2025 Scienza
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  • From the archive: Philosophers on psychedelics

    From the archive: Philosophers on psychedelics
    Jul 17 2026
    Hi friends! We're taking a bit of a summer pause. We will be back soon—in the meanwhile, enjoy this listener favorite from our archives! ----- [originally aired May 14, 2025] Some call it the "psychedelic renaissance." In the last decade or so, interest in psychedelic drugs has surged—and not just among Silicon Valley types and psychiatrists and neuroscientists. It's also surged among a stereotypically soberer crowd: academic philosophers. The reasons are clear. With their varied and sometimes transformative effects, psychedelics raise ethical questions, epistemological questions, metaphysical questions, questions about the nature of experience and the nature of the mind. My guest today is Dr. Chris Letheby. Chris is a philosopher of cognitive science at the University of Western Australia and the author of the 2021 book, Philosophy of Psychedelics. Here, Chris and I talk about the so-called classic psychedelics—LSD, psilocybin, ayahuasca, and others—and how interest in them has gone through three distinct waves. We discuss the effects that these substances seem to have, in particular their capacity to treat certain psychiatric conditions and their tendency to induce "mystical-like" experiences. We consider the idea that psychedelics might serve as agents of moral enhancement. And we dig into the psychological and neural mechanisms by which psychedelics seem to have their diverse—and often salutary—effects. Along the way, we talk about ontological shock, comforting delusions, brain plasticity, unselfing, microdosing, placebo effects and adverse effects, physicalism and idealism, the REBUS model, environmental virtues, plant consciousness, meditation, and much more. Maybe this is obvious but this episode is not just for the seasoned psychonauts out there. Whatever your personal experience with these substances, they offer a distinctive window into the mind—a new way of grappling with big questions. Perhaps this much is also obvious but we're not encouraging or endorsing the use of psychedelics here—just offering a little fuel for your intellectual fires! Alright friends, on to my conversation w/ Dr. Chris Letheby. Enjoy! A transcript of this episode is available here. Notes and links 4:00 – For a brief historical overview of research into psychedelics, see this paper. 8:30 – For work by an early trailblazer in the philosophy of psychedelics, see Thomas Metzinger's Being No One. 12:30 – For our earlier episode on the psychology and philosophy of visual illusions, see here. 18:00 – For a history of the concept of "set and setting," see here. 19:00 – A 2024 review of "adverse events" in classic psychedelics. 26:00 – A blog post on the history of the term "psychedelic." 27:00 – A recent review and meta-analysis of the use of psychedelic therapy for depressive symptoms. 31:00 – On mystical experience see Walter Stace's classic work, Mysticism and Philosophy. On the measurement of mystical-type experiences, see, e.g., Walter Pahnke's paper here. 36:00 – On the idea of "psychoplastogens," see here. 39:00 – See our earlier audio essay on placebo effects. 41:00 – For the study using Ritalin as an active placebo, see here. 44:00 – Michael Pollan's book on psychedelics is here. 48:00 – On the idea of "idealism," see here. 50:30 – For the 2021 study on psychedelics' capacity to alter metaphysical beliefs, see here. 54:00 – For Dr. Letheby and collaborators' paper about the "mysticism wars," see here. 1:02:00 – For a popular article on the possibility that psychedelics reduce fear of death, see here. 1:03:00 – For Dr. Letheby's paper on psychedelics and the fear of death, see here. 1:11:00 – The phrase "comforting delusion" comes from an article by Michael Pollan. 1:15:00 – For the "REBUS model," see here. 1:20:00 – On the idea that psychedelics could serve as agents of moral enhancement, see the paper by Brian Earp here. 1:21:00 – For Dr. Letheby's paper on psychedelics and environmental virtues, see here. For his paper on psychedelics and forgiveness, see here. 1:23:00 – On the subfield of "virtue ethics," see here. On the virtue of "living in place," see the paper by Nin Kirkham here. 1:28:00 – For the New Yorker article, by Matthew Hutson, on how psychedelics led him to see trees as smart, see here. For the study, led by Sandeep Nayak, on psychedelics leading people to expand their attributions of consciousness, see here. 1:32:00 – For a first paper by Dr. Letheby on the comparison between meditation and psychedelics, see here. Recommendations Psychedelic Experience, Aidan Lyon Varieties of Psychedelic Experience, Robert Masters & Jean Houston The Antipodes of the Mind, Benny Shanon Many Minds is a project of the Diverse Intelligences Summer Institute, which is made possible by a generous grant from the John Templeton Foundation to Indiana University. The show is hosted and ...
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    1 ora e 41 min
  • The origins of Darwin's ideas

    The origins of Darwin's ideas
    Jul 3 2026
    No discipline, no sphere of intellectual life, has been untouched by the work of Charles Darwin. He died in 1882 but his ideas are very much alive; they're now central to how we understand the natural world, the human mind, non-human minds, plants, biogeography, morality and emotion, culture, language, and more. But where did his ideas come from? How did they grow out of his travels, his social circle, his hobbies, his particular cast of mind? My guest today is Dr. Janet Browne. Janet is Professor Emerita at Harvard University in the department of the History of Science. She is perhaps best known for her widely acclaimed two-volume biography of Charles Darwin. And she has now published an updated and abridged single-volume version. Here, Janet and I talk about Darwin's life and ideas. We pick up the story during his travels on the Beagle, a five-year voyage that laid the foundation for the rest of his career. We talk about what he was reading, what he was seeing, and how these experiences helped form his most influential work, On the Origin of Species. We discuss Darwin's style as a thinker, as a naturalist, as a writer, and as an experimentalist. We touch on his relationships with contemporaries like Charles Lyell and Alfred Russel Wallace. And we consider his long—and often overlooked—engagements with pigeons, barnacles, plants, and worms. I greatly enjoyed Janet's two-volume biography of Darwin, and I enjoyed this new single-volume edition just as much. So if this episode sparks your interest, I heartily recommend that you check these books out. Alright friends, on to my conversation with Dr. Janet Browne. Enjoy! Notes 3:30 – Darwin's autobiography is available here. All of Darwin's letters are readable (and searchable) at the Darwin Correspondence Project. 11:00 – Darwin's account of his five-year stint on the HMS Beagle can be found in his book, The Voyage of the Beagle. 17:00 – Charles Lyell's Principles of Geology (Vol. 1). 27:00 – For a recently published history of Lamarck and his ideas, see here. 31:00 – For more on Darwin's interest in pigeons and pigeon breeding, see here. 34:00 – For more on Darwin's barnacle studies, see here. 40:00 – For a brief account of the relationship between Wallace and Darwin, see Dr. Browne's article here. 44:00 – Alfred Russel Wallace's The Malay Archipelago is here. Wallace's own essay on natural selection, sent to Darwin before the publication of On the Origin of Species, is here. The proceedings in which Darwin's and Wallace's first papers on natural selection appeared together. 53:00 – For a modern treatment of the concept of sexual selection, see here. For an online version of Darwin's The Descent of Man, see here. For a recent collection of essays on Darwin's Descent, including one by Dr. Browne, see here. 58:00 – Darwin's The Expression of the Emotions in Man and Animals. 1:03:00 – Darwin's short article, 'A biographical sketch of an infant.' 1:08:00 – Darwin's The Power of Movement in Plants. For more about Darwin's last book, The Formation of Vegetable Mould, through the Action of Worms, see here. For more about Darwin's "root-brain hypothesis," see our earlier episode. 1:14:00 – For more on Darwin's theory of gemmules and pangenesis, see here. 1:15:00 – For more on Darwin's substantial archive, see here. Recommendations Darwin and the Barnacle, Rebecca Stott Natural Magic, Renée Bergland
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    1 ora e 19 min
  • The sparkling deep

    The sparkling deep
    Jun 20 2026
    It's tempting to see bioluminescence as an oddity, one of those rare eccentricities of life on earth. And, on land, maybe that's true. But our planet is mostly water, and out in the open ocean bioluminescence is utterly commonplace. Creatures of all shapes and sorts sparkle and glow, glitter and pulse. But what are these displays for? Why did they evolve? How did light become the currency of the deep? My guest today is Dr. Sönke Johnsen. Sönke is a Distinguished Professor of Biology at Duke University, where he and his research group study the visual ecology of the ocean. He's the author of a number of books: most recently Into the Great Wide Ocean, about life in the pelagic realm, and The Radiant Sea, a photographic tour of bioluminescence and color, written in collaboration with Dr. Steven Haddock. Here, Sönke and I talk about the open ocean: the most common habitat on our planet, yet one that many people will never experience. We consider the curious distribution of bioluminescence— rare on land, exceptionally prevalent in the ocean, and all but absent in freshwater. We talk about how bioluminescence seems to have evolved—many, many times over in fact. We survey the functions of making light in the deep—from counter-illumination to courtship to revenge. Finally, we consider what Sönke takes to be the biggest remaining puzzle about bioluminescence at sea. Alright friends, if you're enjoying Many Minds, we ask (humbly) if you would think about rating us, reviewing us, leaving us a comment, boosting us on social media, or perhaps haranguing your friends—relentlessly—until they give us a listen. Without further ado, onto my conversation with Dr. Sönke Johnsen. Enjoy! Notes 3:30 – The scientific report by Dr. Johnsen and colleagues describing the bioluminescent octopus, Stauroteuthis syrtensis. 12:00 – A popular article on the bristlemouth. The article reports a scientist's estimate of "as many as a dozen [bristlemouths] per square meter of ocean." 15:00 – A recent discussion of the "burglar alarm hypothesis." 18:00 – The website for the Johnsen Lab at Duke University. 24:00 – A chart and discussion of the depth zones of the ocean. 29:30 – A study by Séverine Martini and Steven Haddock quantifying the prevalence of bioluminescence at different depths. A popular write-up of the same study. 33:00 – A popular article on vertical migration in the ocean, also called "diel vertical migration." A recent scientific study of the phenomenon. 39:00 – A recent article on the evolution of bioluminescence. 45:00 – For detailed scientific discussion of the physical basis of bioluminescence, fluorescence, and other phenomena we discuss, see Dr. Johnson's book, The Optics of Life. 52:00 – For previous episodes on the use of sound in the animal kingdom, see here and here. For our previous episode on electroreception and electric ecology (including in marine organisms), see here. 57:00 – For more on the functions of bioluminescence, see here. For a report of a recently discovered function of bioluminescence, see here. 1:03:00 – An article by Dr. Johnsen about the different colors of bioluminescence present in the deep sea. 1:05:00 – A video of ostracod mating displays. 1:08:00 – For our recent episode on cave art, see here. 1:16:00 – For our earlier episode on firefly synchronization, see here. Recommendations Website and review article by Steven Haddock The lab of Todd Oakley Below the edge of darkness, Edie Widder Many Minds is a project of the Diverse Intelligences Summer Institute, which is made possible by a generous grant from the John Templeton Foundation to Indiana University. The show is hosted and produced by Kensy Cooperrider, with help from Assistant Producer Urte Laukaityte and with creative support from DISI Directors Erica Cartmill and Jacob Foster. Our artwork is by Ben Oldroyd. Subscribe to Many Minds on Apple, Stitcher, Spotify, Pocket Casts, Google Play, or wherever you listen to podcasts. You can also now subscribe to the Many Minds newsletter here! We welcome your comments, questions, and suggestions. Feel free to email us at: manymindspodcast@gmail.com. For updates about the show, visit our website or follow us on Bluesky (@manymindspod.bsky.social).
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    1 ora e 20 min
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