November 19, 2020

Seven and a Half Lessons About the Brain

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If you think you know all about the brain, think again! According to neuroscientist and Northeastern University professor of psychology Lisa Feldman Barrett (How Emotions Are Made) in her delightful new book Seven and a Half Lessons About the Brain, “your brain is not for thinking.” This is the titular half-lesson that introduces this slim tome of short, informal essays, which are “best read in order, but you can also read them out of sequence.” Instead of including all the scientific specifics in the book itself (which, quite honestly, could get tedious if you're reading for pleasure), Barrett handily moves the full explanations and references to her website,, and merely includes an appendix with selected details at the back of the book.

Barrett poses some interesting questions, such as “Why did brains evolve?”—busting the myth that it was for thinking and revealing that it was actually for body-budgeting, providing energy efficiency for our ancestors much like a renewably fueled car. She writes with precision and clarity as she covers topics as broad as the tricky business of comparing different species' brains, the fact that all mammals' brains are built from a single manufacturing plan and the difference between brains and minds.

Barrett uses comparisons to everyday things and practices to help readers understand the brain’s complexity. For example, in the chapter “Your Brain Is a Network,” she likens the brain’s vast collection of interconnected parts to the internet’s network of linked devices and the intricate dispatch routes of transportation networks. As a result, interesting concepts such as tuning (strengthening the connections between neurons) and pruning (when less-used connections weaken and die off) are presented in approachable ways.

Some topics are less fun but still worthy of consideration, such as the heartbreaking effects of adversity, poverty and neglect on the brains of developing children. Barrett also explains what sets our brains apart from those of other species, highlighting the things that make us human, such as social reality, creativity and communication.

The brain can do a great deal of impressive things yet still misunderstand itself. On the path to better self-knowledge, Seven and a Half Lessons About the Brain sheds some light on our most powerful organ and its intriguing processes.

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