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Episode 11 15.03.2015
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How does the brain transform a fleeting touch on the fingertip into a deliberate decision seconds later? Neurophysiologist Ranulfo Romo explains how sensory representations are maintained, transformed, and compared across cortical areas , revealing the slow, parametric neural code that bridges perception and decision-making. Subscribe for more from the Convergent Science Network podcast series. Ranulfo Romo joins Paul Verschure and Tony Prescott at the BCBT summer school to discuss decades of work tracing how somatosensory signals travel from primary cortex to frontal decision-making areas in the primate brain. Using a vibrotactile discrimination task in which monkeys compare two temporally separated stimuli, Romo has mapped the transformation of sensory information at each stage , from faithful isometric representations in S1 arriving within 25 milliseconds, to slowly ramping parametric codes in prefrontal and premotor areas emerging around 180 milliseconds. The discussion addresses why Romo insists on unimodal processing in primary sensory cortex, a position he has tested for over a decade against the competing multimodal hypothesis. He argues that the neural doctrine , the idea that cortical territories are defined by their thalamic inputs , still holds, and that the key scientific question is how a sensory representation is progressively transformed as it passes through successive cortical areas, each treating the signal differently before passing it on. During the delay period between stimuli, frontal neurons maintain a ramping activity that preserves the stimulus parameter while discarding irrelevant features , a process Romo links to the ancient philosophical tradition from Democritus and Epicurus about how the brain generates internal representations of the external world. Key topics include the distinction between fast sensory and slow cognitive processing systems, the role of neuromodulators in bridging these timescales, why decision-making is context-dependent and sometimes unconscious, the relationship between Libet’s conscious awareness timing and primate neurophysiology, and the challenge of procrastination as a decision-making phenomenon. Part of the Convergent Science Network podcast series from the BCBT Summer School.
Tagged as:
Brain Cortical Areas decision making Sensory somatosensory cortex
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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