
Neurophysiologist Robert Lawrence Kuhn, best known as the creator of the PBS series Closer to Truth, has published a book-length review that places every major explanation of consciousness on a single conceptual map. Appearing in Progress in Biophysics and Molecular Biology (Vol. 190, Aug 2024), the paper arranges proposals in ten broad families that run from strictly brain-based materialism through quantum ideas, panpsychism and idealism, all the way to theories that challenge whether consciousness can ever be explained at all.
Kuhn’s aim is descriptive, not judgmental: he “collects and categorizes” the views of more than two hundred scientists and philosophers he has interviewed over three decades, showing how each theory frames questions about meaning, free will, artificial intelligence, and the possibility of life beyond death.
By setting the diverse positions side by side, the taxonomy helps readers see where different arguments overlap, where they conflict, and why consensus remains elusive. Kuhn concludes that progress on the “hard problem” will require the same intellectual diversity his map records, and a willingness to keep multiple possibilities in play until evidence rules them in or out.
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