This is short (125 pages, plus notes) for a book about an organ which has upwards of 120 billion neurons); but then, the author does state quite clearly at the outset that, “I wrote this book of short, informal essays to intrigue and entertain you. It’s not a full tutorial on brains.” So fair enough.
    The general idea is to correct some popular misunderstandings, and it covers: what the brain does, its main job (and that’s not, primarily, thinking); its overall structure and how it is organised; how the brain of a newborn differs from, and eventually becomes, that of an adult; how the brain works, very broadly speaking, by making predictions about the world; the brain as a social entity; the extent to which minds can vary (particularly from one culture to another); and finally, how brains create our day-to-day experience.
    A lot to cover maybe, but Seven and a Half… is worth the read and sets straight a number of misconceptions, “facts” which are either out of date or just plain wrong. Such as: the “triune brain” idea (i.e. instincts, then emotions, then rationality) which is not just out of date, but decades out of date; or that the mind is continually “at war with itself” (instinct + emotion versus rationality): also nonsense. Then there’s the so-called “limbic system”, supposedly the source of the emotions: it doesn’t exist. Then there’s “left-hemisphere (logical, analytical) versus right-hemisphere (intuitive, holistic)”: pure rubbish. Or that it’s “nature versus nurture” in the development of infant brains: a pointless distinction. And what about the idea that there’s something fundamental called “human nature” which all of us, everywhere, share? There isn’t.
    Overall? This is well-written, and for anyone new to brain science who is reading their very first book on the subject, I reckon 7½… would be a good one to read second—just to set straight any lingering popular myths still being perpetuated by the first one. ( )

Very clear and understandable presentation of current brain science. ( )

Very short, ok I guess, but I didn’t see much of anything new or any kind of different take on understanding brains. A fine intro really, if you haven’t read much about the topic. ( )

It’s hard to top the opening paragraph in this short primer about the current scientific understanding of our brains: “Once upon a time, the Earth was ruled by creatures without brains. This is not a political statement, just a biological one.” In fact, Lisa Barrett, eminent neuroscientist and University Distinguished Professor at Northeastern University, evidently enjoys slyly sprinkling her account with pertinent political examples affording her plausible deniability. On the human construction of social reality: “We could have a leader who says terrible things on video, and then news outlets could agree that the words were never said. That’s what happens in a totalitarian society. Social reality may be one of our greatest achievements but it’s also a weapon we can wield against each other.” The book may cover complex material, but the author delivers it with a sense of fun and humor.

While Barrett is at the forefront of neuroscience research, her book also demonstrates her ability to translate complex and technical material into clear and concise communications, easily absorbed by the reader. Extensive references and expanded details are available on an associated website.

She dispenses with well-intended fallacies about the brain, substituting instead cogent explanation with minimal jargon. Seven and a Half Lessons About the Brain reads like a synthesis of the last decade or two of the thinking in brain science. She has performed an invaluable service by distilling this emerging understanding into a set of bite-sized narratives that summarize how neuroscientists think about their subject.

I particularly appreciate her attention to metaphors. People have long put forward their ideas about the brain, often seemingly oblivious to their metaphorical and often misleading consequences. For example, one hears the distorted claim that the left side of the brain is linguistic and logical, while the right is intuitive and creative. That one was especially in vogue when I was a neuroscience student in the late ‘70s. People use phrases like “the storage of memories”, as if the brain handles files like a computer and places them in an ordered location for later retrieval. And no, your brain doesn’t have an ancient reptilian layer dedicated to instinct and survival. To her credit, she devotes time to warning about the lure of simplification, wherein metaphor can substitute for explanation, and alerts the reader to examples of her own use of metaphor, along with her reasons and intentions.

While this slim volume doesn’t require even more compression here, I’d be remiss if I didn’t say something about one of her central teaching points about the brain. This is no substitute for Barrett’s careful and clear narrative. The brain uses the sensory data it’s receiving to help you survive. It does it’s best job at this essential task not by waiting patiently for clarity about the meaning of the information it’s receiving. One cannot afford to confirm that a charging tiger is in fact about to sink its teeth into your throat. Instead, the brain anticipates, utilizes memories of past similar experiences and brain states, and uses these to make predictions about what is likely to happen next. We are not aware of this process, but the neural conversation about predictions results in one winning prediction and, to quote Barrett “…the winning prediction becomes your action and your sensory experience.” So in an essential sense, your brain is a prediction device which accelerates your responses, efficiently acting to help you survive. In fact, we couldn’t do something as simple as bouncing a ball were it not for our brain’s ability to accurately predict the behavior of bouncing balls and the body’s interaction with them.

I’ve left out most of the actual lessons in favor of offering the flavor of the book. I’d highly recommend Seven and a Half Lessons About the Brain for anyone interested in a mini-exposition of current neuroscience thinking. Or for anyone like me who could benefit from an update! ( )

Not entirely convinced of the success of the book. It does make it easier for people who may not have had time to read a lot about how the brain works to get familiar with some of the concepts, but this does come potentially at the cost of being too simplistic in part. To her credit, Barrett reminds the reader where to find more detailed I formation throughout the book, and the appendix, about half the book, also goes into more depth. ( )