Cognitive Thrift 4 – Motor Ability

In-Sight Publishing

Cognitive Thrift 4 – Motor Ability

Scott Douglas Jacobsen & Rick Rosner

May 9, 2017

[Beginning of recorded material]

Scott Douglas Jacobsen: There’s an aspect to do with motor ability. The degree to which an organism travels. How regular and localized is its general itinerary in addition its kin? And human beings having a very large brain in proportion to their body size and in general, in addition to a deep interconnectivity amongst its parts, more than any other animal travel the farthest, I think, on average as a general principle. You can, for instance, make a counterargument via birds migrating, but, as a rule, I think the bigger the brain the farther the travel.

Rick Rosner: Yea, but birds go from on type of environment to another type of environment. Their environments are nearly as varied as humans, and expanded to cover, or at least can survive in, 70-80% of the world’s land areas When you look at the pressures on humans or the things that allowed humans to develop big brains, you have size. Animals the size of a lemur cannot support a human size brain, but larger primates can support larger brains.

Standing upright, which frees the hands, which means you need more brain power to work your fingers to manipulate things with any kind of dexterity, you need expanded powers of visualization to go along with that ability to manipulate things with your fingers.

None of that explains genetically why you’re able to develop big brains, but it gives bonus drives and pressures to develop big brains, and along with dextrous hands you’ve got the ability to develop tools, which allow you to survive a greater variety of environments.

Also, we need resources. As predatory mammals, we’re physically untalented. We’re not fast. We’re not particularly strong. So, when you hunt as a hunter-gatherer, we need to communicate to hunt effectively.

[End of recorded material]



Rick Rosner

American Television Writer


Rick Rosner


Scott Douglas Jacobsen

Editor-in-Chief, In-Sight Publishing


In-Sight Publishing


[1] Four format points for the session article:

  1. Bold text following “Scott Douglas Jacobsen:” or “Jacobsen:” is Scott Douglas Jacobsen & non-bold text following “Rick Rosner:” or “Rosner:” is Rick Rosner.
  2. Session article conducted, transcribed, edited, formatted, and published by Scott.
  3. Footnotes & in-text citations in the interview & references after the interview.
  4. This session article has been edited for clarity and readability.

For further information on the formatting guidelines incorporated into this document, please see the following documents:

  1. American Psychological Association. (2010). Citation Guide: APA. Retrieved from
  2. Humble, A. (n.d.). Guide to Transcribing. Retrieved from

License and Copyright

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Based on a work at and


© Scott Douglas Jacobsen, Rick Rosner, and In-Sight Publishing and In-Sight: Independent Interview-Based Journal 2012-2017. Unauthorized use and/or duplication of this material without express and written permission from this site’s author and/or owner is strictly prohibited. Excerpts and links may be used, provided that full and clear credit is given to Scott Douglas Jacobsen, Rick Rosner, and In-Sight Publishing and In-Sight: Independent Interview-Based Journal with appropriate and specific direction to the original content.

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