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Many Minds

Many Minds

By: Kensy Cooperrider – Diverse Intelligences Summer Institute
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Summary

 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 Science
Episodes
  • The inner life of the hand

    The inner life of the hand
    May 7 2026
    Newton saw in the human hand proof of the divine; Darwin saw a key to our species' success. Many others, too, have described the hand in hyperbolic terms, as a paragon of design, a cornerstone of human uniqueness, an engine of our achievements. But what makes the human hand so powerful? Is it the proportions of the fingers? Is it the opposability of the thumb? Or, could it be none of this? Could it be that the real power of our hands lies—not in the physical design—but elsewhere, out of sight? My guest today is Dr. Matt Longo. Matt is Professor of Cognitive Neuroscience at Birkbeck, University of London. He's the author of the recent book, The Invisible Hand, a wide-ranging tour of the human hand and how it's geared into the brain. Here, Matt and I talk about the difference between the "visible hand"—that is, its physical structure—and the "invisible hand"—its representation in the brain. We consider the evolution of the visible hand and whether there really is anything truly distinctive or impressive about it. We talk about the biology of touch. We tour the invisible hand, discussing how—through cortical magnification—the hand becomes over-represented in the brain's sensory maps. We catalogue a few ways that the hands can go awry. And we talk about whether we should feel any nostalgia for all the hand-based activities and crafts that we're losing. Along the way, we also touch on star-nosed moles and raccoons; tetrapods and the primitive archetype; hand dominance; the parallel between a horse's knee and a human's wrist; tool use, plasticity and abstraction; homunculi; the rubber-hand illusion; supernumerary fingers; the Third Thumb project; and the question of what it might unlock if dolphins had hands. Alright, friends, this is a fun one. On to my interview with Dr. Matt Longo! Notes 3:00 – For discussion of the many traits and behaviors that have been proposed as uniquely human, see our earlier audio essay. 5:00 – For an example of the "if only dolphins had hands" thought experiment, see here. 8:00 – See The Principles of Anatomy as Seen in the Hand by Frederic Wood Jones. 10:30 – Dr. Longo's book, The Invisible Hand, is available open access here. 16:00 – For discussion of how—in horses and other species—the five digits have been reduced or otherwise tweaked over evolution, see here. For an image showing examples of homology between the human forelimb and the forelimbs of other creatures, see here. 19:00 – For a brief discussion of "thumb opposability," see here. For an influential discussion of hand morphology and human hand grips, see work by Mary Marzke here. 30:00 – For our earlier episode on the brain's many maps, see here. 34:00 – For a discussion of Penfield's work and the idea of a "homunculus" in the brain, see here. 42:00 – For an illustration of a "homunculus" with big lips and hands, see here. 44:30 – For more on the star-nosed mole and its distinctive appendage, see here. 49:00 – For the report that first coined the term "numbsense," see here. For recent work on "anarchic hand," see here. For more on phantom limbs, see here. For a classic study of the "rubber hand illusion," see here. 59:30 – For a discussion of hand-dominance across primate species, see here. 1:03:00 – More on the "Third Thumb" project. 1:06:00 – A classic case of "motor equivalence" is seen in handwriting. Recommendations Marco Catani, 'A little man of some importance' Tracy Kivell, 'Evidence in hand: Recent discoveries and the early evolution of human manual manipulation' Hands, by John Napier 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 hr and 10 mins
  • From the archive: The cuttlefish and its coat of many colors

    From the archive: The cuttlefish and its coat of many colors
    Apr 22 2026
    Hi friends! We're skipping a beat to take care of some spring housekeeping tasks. We will be back in May! In the meanwhile, enjoy this listener favorite from our archives! ----- [originally aired April 30, 2025] We humans have a hard time becoming invisible. For better or worse, we're basically stuck with the skin and body we have; we're pretty fixed in our color, our shape, our overall appearance. And so we're fascinated by creatures that aren't—creatures that morph to meet the moment, that can functionally disappear, that can shape-shift on a dime. And no creatures are more skilled, more astonishing, more bedazzling in their abilities to do this kind of thing than the cephalopods. But how do they do this exactly? What's going on in their skin? What's going on under their skin? And what's going on in their brains that makes this all possible? My guest today is Dr. Tessa Montague. Tessa is a neuroscientist in the Axel Lab at Columbia University; she studies the brain and behavior of the dwarf cuttlefish, with a special focus on the biology of their dynamic skin behaviors. Here, Tessa and I talk about how cuttlefish and other cephalopods exhibit the most impressive camouflaging abilities on the planet. We discuss how they change their skin's appearance with remarkable speed and fidelity—and not just when trying to blend in, but also when hunting, courting, fighting, and more. We talk about whether these behaviors are flexible and whether they're voluntary. We linger on the cruel irony that cuttlefish seem to be colorblind. We talk about the idea that a cephalopod's skin is kind of a window into their brain. We lay out the cells and organs in the cephalopod skin the make these behaviors possible—especially the tiny pigment-bearing structures called "chromatophores." And of course we also dive deep into the cephalopod brain and its sometimes bizarre and poorly understood structures. Excited to share it with you friends—I think you'll enjoy it. Without further ado, here's my chat with Dr. Tessa Montague. A transcript of this episode is available here. Notes and links 3:00 – For more on Dr. Montague's recent expeditions to the Philippines, including photos, see here. 7:30 – Dr. Montague has published two recent reviews of dynamic skin behaviors in cephalopods—see here and here. We previously discussed cephalopod intelligence in a 2021 episode with Dr. Alex Schnell and a 2023 episode with the novelist Ray Nayler. 18:30 – For discussion of a recent "renaissance" in new model organisms, see here. 20:30 – For more on how chameleons change color, see this video. 25:00 – A video primer on cuttlefish camouflage, featuring the researcher Dr. Robert Hanlon. 30:30 – A recent paper on the details of pattern matching in cuttlefish camouflage. 31:00 – For more on the mimicking plant Boquila trifoliolata, see this popular article. See also our earlier episode with Dr. Paco Calvo and Dr. Natalie Lawrence. 35:00 – A video about the so-called mimic octopus. 40:00 – For the hypothesis about color discrimination via chromatic aberration and pupil shape, see here. 44:00 – For more on the "split body" skin behaviors observed in some cuttlefish, see here. 51:00 – For the David Attenborough clip about a cuttlefish hypnotizing a crab, see here. For the recent New York Times article on cuttlefish hunting behavior, including videos, see here. For the academic article that inspired the New York Times piece, see here. 58:00 – A recent scientific study on the possibility of octopus skin activity during dreaming. A video that helped popularize the idea of cephalopod skin activity as evidence of dreaming. Our earlier episode on why we—and other creatures—dream. 1:06:00 – For a study on chromatophore development from the lab of Dr. Gilles Laurent, see here. 1:11:00 – For more on papillae, including videos, see here. 1:17:00 – To explore an animated model of the cuttlefish brain, see this page of Dr. Montague's website, Cuttlebase. Recommendations Monarchs of the Sea, Danna Staaf Other Minds, Peter Godfrey-Smith Cephalopod Behavior, Roger Hanlon & John B. Messenger 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. Our transcripts are created by Sarah Dopierala. 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 ...
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    1 hr and 34 mins
  • Illuminating cave art

    Illuminating cave art
    Apr 9 2026
    Deep in our past, in the dark depths of caves, our ancestors did something strange and beautiful. Working by firelight, some doodled little designs. Others made hand stencils. Some saw a bulge of rock, or a crack in the wall, and thought to turn it into a horse or a bison. Why did they make this art? What did it mean to them? Who were these artists? These questions are old—very old—but thanks to new methods and new interpretive frameworks, archaeologists are beginning to see them in a new light. My guest today is Dr. Izzy Wisher. Izzy is an archaeologist at Aarhus University in Denmark, specializing in Paleolithic art. Here, Izzy and I talk about why we in the present are so drawn to cave art. We lay out the basic timeline, geography, and categories of Paleolithic art. We consider the difference between figurative and non-figurative art, and why it might be that non-figurative art came first. We discuss hand stencils. We talk about an ongoing shift in archaeology known as the "sensory turn." We dig into some of Izzy's work on the role of pareidolia, palimpsests, and children in cave art. And we touch on an ongoing project she is involved in trying to understand the earliest symbolic marks that our species made—and what they could have been used for. Along the way we touch on the site known as El Castillo, Werner Herzog, hunting magic, why hand stencils are so often missing fingers, graffiti, tectiforms and flutings, why depictions of humans are actually quite rare in cave art, stages in children's art production, the use of virtual reality as a research method, and the idea of archaeology as world-building. I think you'll enjoy this one friends. Who among us—after all—doesn't feel drawn to these caves, to these most enigmatic of human creations? Without further ado, here's my conversation with Dr. Izzy Wisher. Notes 3:00 – For more on El Castillo cave, see here and here. 9:00 – Werner Herzog's film—Cave of Forgotten Dreams—is being briefly re-released in April 2026. 12:00 – For some of Dr. Wisher's popular writing on cave art, see here and here. 16:30 – One example of a recent rock art finding in Sulawesi. 20:30 – Our earlier episode with Dr. Eleanor Scerri and Dr. Manuel Will, in which we discuss the mostly retired idea of a "cognitive revolution" in Europe in the Upper Paleolithic. 22:00 – For more on the recently discovered rock art panel in Colombia, see this news story and this recent academic study. 25:00 – The relative rarity of humans in Paleolithic art has provoked much discussion, both among scholars and the public. 27:00 – On the idea that Venus figurines might be self-representations—made from the perspective of the artist viewing her own body—see here. 29:00 – For a recent treatment of the "missing fingers" in hand stencils, with some overview of different hypotheses, see here. For more on the idea that such stencils could constitute a system of hand-signs, see here. 34:00 – A popular article by Dr. Wisher about one example of portable art—a deer-tooth necklace with engraved designs. 36:00 ­– For a discussion of the earliest non-figurative art, see here. For one account of the transition from non-figurative to figurative art, including discussion of hand stencils, see here. 42:00 – A paper in which Dr. Wisher and a colleague discuss the "sensory turn" in archaeology and how her work contributes to it. 51:00 – Dr. Wisher's studies on pareidolia are here and here. 59:00 – For Dr. Wisher's study of palimpsests in cave art, see here. 1:07:00 – For an influential early study on cave marking by children, see here. For Dr. Wisher's recent study of children's art in the caves, see here. A book by Dr. John Matthews on the development of drawing in children. 1:14:00 – The website of the eSYMB project is here. An important early publication by this group is here. A recent overview of the project and its context by Dr. Wisher and colleagues. 1:18:00 – A recent paper arguing that certain systems of marks represented a "phenological calendar." Another recent paper providing evidence that certain Paleolithic marks constituted a system of conventional signs. 1:22:00 – The paper arguing that archaeology is "world-building." Recommendations Kindred, by Rebecca Wragg Sykes (former guest!) Homo sapiens rediscovered, by Paul Pettitt 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 ...
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    1 hr and 26 mins
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