Comparing animal brains

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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 17–18 is:

In MacLean’s day, scientists compared one animal brain to another [by] squinting [through] a microscope. Neuroscientists who study brain evolution today still do this, but they also use newer methods...

For a brief overview of this topic, see chapter 1 in Striedter & Northcutt.[1]


  1. Striedter, Georg F., and R. Glenn Northcutt. 2020. Brains Through Time: A Natural History of Vertebrates. New York: Oxford University Press.