A network of 128 billion neurons

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A note for Lesson no. 2, "Your Brain Is a Network," in Seven and a Half Lessons About the Brain by Lisa Feldman Barrett.
Some context from page 31 is:

Your brain, in turn, is a network of 128 billion neurons connected as a single, massive, and flexible structure.

The appendix adds:

My count of 128 billion neurons in the average human brain is higher than you may find in other sources, which commonly cite about 85 billion neurons. The difference is due to the fact that neurons can be counted by different methods.

See these references.[1][2][3][4]


  1. Andersen, Birgitte Bo, Lise Korbo, and Bente Pakkenberg. 1992. "A Quantitative Study of the Human Cerebellum With Unbiased Stereological Techniques." Journal of Comparative Neurology 326 (4): 549–560.
  2. Deniz, Omür Gülsüm, Gamze Altun, Arife Ahsen Kaplan, Kiymet Kübra Yurt, Christopher S. von Bartheld, and Suleyman Kaplan. 2018. “A Concise Review of Optical, Physical and Isotropic Fractionator Techniques in Neuroscience Studies, Including Recent Developments.” Journal of Neuroscience Methods 310: 45–53.
  3. Kiessling, Maren C., Andreas Büttner, Camilla Butti, Jens Müller-Starck, Stefan Milz, Patrick R. Hof, Hans-Georg Frank, and Christoph Schmitz. 2014. "Cerebellar Granule Cells Are Generated Postnatally in Humans." Brain Structure and Function 219 (4): 1271–1286.
  4. Walløe, Solveig, Bente Pakkenberg, and Katrine Fabricius. 2014. “Stereological Estimation of Total Cell Numbers in the Human Cerebral and Cerebellar Cortex.” Frontiers in Human Neuroscience 8: 508. See Table 3 and Figure 4.