Rejecting the idea of a three-layered brain

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A note for Lesson no. 1, "You Have One Brain (Not Three)," in Seven and a Half Lessons About the Brain by Lisa Feldman Barrett.
Some context from page 17‌‌ is:

By the 1990s, experts had completely rejected the idea of a three-layered brain.

See Striedter & Northcutt, section 1.3.1,[1] or this recent summary.[2]


  1. Striedter, Georg F., and R. Glenn Northcutt. 2020. Brains Through Time: A Natural History of Vertebrates. New York: Oxford University Press.
  2. Cesario, Joseph, David J. Johnson, and Heather L. Eisthen. 2019. "Your Brain Is Not an Onion with a Tiny Reptile Inside." PsyArXiv Preprints, DOI 10.31234/