The Attenuation of Light and Water

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Water is a terrible medium for seeing with light. You lose a huge amount of information on the order of meters. If you add any particles in the water, then your range really goes down to nothing. And so whales and dolphins are really interesting example of vertebrates that got used to giant visual sensoria doing the one thing that you could do in water to regain that kind of range.

Consciousness has many aspects, from experience to wakefulness to self-awareness. One aspect is imagination: our minds can conjure up multiple hypothetical futures to help us decide which choices we should make. Where did that ability come from? Today’s guest, Malcolm MacIver, pinpoints an important transition in the evolution of consciousness to when fish first climbed on to land, and could suddenly see much farther, which in turn made it advantageous to plan further in advance. If this idea is true, it might help us understand some of the abilities and limitations of our cognitive capacities, with potentially important ramifications for our future as a species. Support Mindscape on Patreon or Paypal. Malcolm MacIver received his Ph.D. in neuroscience in 2001 from the University of Illinois and the Beckman Institute of Advanced Science and Technology. (This was after an unconventional childhood where he dropped out of school at age 9 and later talked his way into a community college program.) He is currently a professor of Mechanical Engineering, Biomedical Engineering, and Neurobiology at Northwestern University. In 2009 he was awarded the Presidential Early Career Award for Science and Engineering. Northwestern Web Page Google Scholar Talk on sensing and planning Paper: “The Shift to Life on Land Selected for Planning” Twitter See Privacy Policy at https://art19.com/privacy and California Privacy Notice at https://art19.com/privacy#do-not-sell-my-info.