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Episode 3 15.03.2015
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How does an animal with no skeleton, no somatotopic brain map, and eight arms containing more neurons than its central brain manage to produce precise, goal-directed movements? Neuroscientist Benny Hochner reveals how the octopus solves the seemingly impossible problem of controlling a soft body with infinite degrees of freedom. Subscribe for more from the Convergent Science Network podcast series. Benny Hochner joins Paul Verschure and Tony Prescott at the BCBT summer school to discuss his research on motor control and learning in the octopus , an animal he describes as the most intelligent invertebrate and a remarkable case study in convergent and divergent evolution. With half a billion neurons, most distributed across its eight arms rather than centralized in the brain, the octopus has evolved a radically different solution to motor control than vertebrates. For reaching movements, it reduces its theoretically infinite degrees of freedom to just three by propagating a wave of muscle stiffening along the arm, creating a simple but effective motor program that can be generated even in a completely severed arm. The discussion explores the hierarchical organization of the octopus nervous system, from autonomous arm reflexes to coordinated whole-body behavior. A severed arm can still grasp food and pass it along its suckers toward where the mouth would be. The central brain appears to encode motor programs rather than body maps , no somatotopic organization has been found for either motor commands or sensory processing. Remarkably, tactile discrimination learned with one arm generalizes to all others, confirming central involvement in learning but not in arm-specific representation. Hochner also describes convergent findings in learning and memory: the octopus vertical lobe resembles the mammalian hippocampus in structure and exhibits robust activity-dependent long-term potentiation, though mediated by molecular mechanisms modified from simpler molluscan ancestors. Key topics include why the octopus is scientifically important as an independently evolved intelligent invertebrate, how muscular hydrostats solve the degrees-of-freedom problem through embedded motor primitives, why no body map exists in the octopus central brain, how the fetching movement creates a temporary articulated structure from a boneless arm, what the vertical lobe reveals about convergent evolution of learning mechanisms, and how the octopus challenges conventional assumptions about the necessity of body representation for coordinated action. Part of the Convergent Science Network podcast series from the BCBT Summer School.
Tagged as:
Central Brain Eight Arms Infinite Degrees Motor motor control octopus
About the author call_made
Both the triumphs of humanity and its most evil deeds have resulted from collaboration. In a time where humanity is required to aspire to the former and minimize the latter, the question arises of how collaboration arises and why it fails. Surprisingly, this phenomenon, so central to who we are, is not well understood. Hence, a collaborative effort is required to understand collaboration in its full biological, psychological, sociological, cultural, and economic complexity and to translate this understanding into operational impact. This series of podcasts is one step toward achieving these complementary goals. The Collaboration Podcast presents interviews with people who are central orchestrators of collaboration in various domains including business, government, science, art, health, sustainability, and the military. The discussions were conducted by Prof. Dr. Paul F.M.J. Verschure and members of the Program Advisory Committee of the Ernst Strungmann Forum on Collaboration (https://www.esforum.de/forums/ESF32_Collaboration.html) during 2021 and had the goal to sketch a map of opportunities, challenges, and obstacles in human collaboration. The forum took place in May 2022, and now we would like to share this series of interviews with a broader audience. The full report of the Forum will be published in 2023 by MIT Press. The podcast was produced by the Convergent Science Network (https://www.convergentsciencenetwork.org/). Context: The stability of social systems depends critically on realizing sustainable methods of “collaboration,” yet how and by which means collaboration is achieved is not clearly understood; neither are the conditions or processes that lead to its breakdown or failure. Collaboration can be understood as cooperation between agents toward mutually constructed goals. Part of the reason for our lack of understanding is that the phenomenon of collaboration is, by nature, a highly multidisciplinary problem, and effective research into its complexities has been difficult to achieve across the broad range of scientific and technical disciplines involved. The need for a fundamental understanding of collaboration, however, has become increasingly important. Not only does humankind demand answers as it attempts to address critical challenges at multiple scales (e.g., climate change, migration, enhanced automation, social and economic inequality), but ever-increasing technological and economic means of interconnecting people and societies are disrupting long-established, familiar patterns of how we interact. Radical technological changes that are ongoing have the potential to reshape collaboration in ways that are currently hard to predict or influence (e.g., by altering configurations in interaction, information creation, and modes of communication). On one hand, such changes could disrupt hitherto stable forms of collaboration by affecting critical communication channels and traditional roles, as can be observed in the rapidly changing patterns in governance, commerce, and social interaction. Conversely, technology could lead to the emergence of novel, successful forms of collaboration that deviate from traditional “hierarchical” architectures. Evidence of this can be seen in areas as diverse as highly automated manufacturing plants, the open science movement, collaborative software repositories, user-centered services, and the sharing of economy-based modes of organization. Without a fundamental understanding of the mechanisms, processes, and boundary conditions of collaboration, it is not possible to evaluate or predict which of these possible scenarios are sustainable or even plausible. The Forum “How Collaboration Arises and Why it Fails” (May 8–13, 2022, Location: Frankfurt am Main, Germany) Chairs: Andreas Roepstorff and Paul Verschure Program Advisory Committee: Jenna Bednar, Julia R. Lupp, Bhavani R. Rao , Andreas Roepstorff, Ferdinand von Siemens, and Paul Verschure
15.03.2015
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