Brain Rules: 12 Principles for Surviving and Thriving at Work, Home, and School

By Scott A. Heintzelman


Brain Rules In Brain Rules, Dr. John Medina lays out what he considers to be 12 "rules" or "principles" of the brain gleaned from the work of molecular or evolutionary biologists, those who study brain tissues, experimental psychologists and cognitive neuroscientists.  The beauty of the book is that for the first time ever I have had a glimpse into the inner workings of my own mind and gained a new level of understanding for much of what is happening inside my thick skull.  Even for those of us that don’t have a science background this work is written in lay terms.


All 12 brain rules have practical applications for our personal and professional lives.

  1. Exercise – Exercise boosts brain power:

  • Exercise increases oxygen flow into the brain, which reduces brain-bound free radicals. One of the most interesting findings of the past few decades is that an increase in oxygen is always accompanied by an uptick in mental sharpness.
  • Exercise acts directly on the molecular machinery of the brain itself. It increases neurons’ creation, survival, and resistance to damage and stress.

  1. Survival – The human brain evolved, too:

  • The strongest brains survive, not the strongest bodies. Our ability to solve problems, learn from mistakes, and create alliances with other people helps us survive. We took over the world by learning to cooperate and forming teams with our neighbors.

  1. Wiring – Every brain is wired differently:

  • What YOU do and learn in life physically changes what your brain looks like – it literally rewires it. We used to think there were just 7 categories of intelligence. But categories of intelligence may number more than 7 billion—roughly the population of the world.

  1. Attention – We do not pay attention to boring things:

  • We pay attention to things like emotions, threats and sex. Regardless of who you are, the brain pays a great deal of attention to these questions: Can I eat it? Will it eat me? Can I mate with it? Will it mate with me? Have I seen it before?

  • The brain is not capable of multi-tasking. We can talk and breathe, but when it comes to higher level tasks, we just can’t do it.

  • When you’re always online you’re always distracted. So the always online organization is the always unproductive organization.

  1. Short-term memory – Repeat to remember:

  • The human brain can only hold about seven pieces of information for less than 30 seconds! Which means, your brain can only handle a 7-digit phone number. If you want to extend the 30 seconds to a few minutes or even an hour or two, you will need to consistently re-expose yourself to the information. Memories are so volatile that you have to repeat to remember.

  1. Long-term memory – Remember to repeat:

  • How do you remember better? Repeated exposure to information / in specifically timed intervals / provides the most powerful way to fix memory into the brain.

  1. Sleep – Sleep well, think well:

  • When we’re asleep, the brain is not resting at all. It is almost unbelievably active! It’s possible that the reason we need to sleep is so that we can learn. Loss of sleep hurts attention, executive function, working memory, mood, quantitative skills, logical reasoning, and even motor dexterity.

  1. Stress – Stressed brains do not learn the same way:

  • You have one brain. The same brain you have at home is the same brain you have at work or school. The stress you are experiencing at home will affect your performance at work, and vice versa.

  • The emotional stability of the home is the single greatest predictor of academic success. If you want your kid to get into Harvard, go home and love your spouse.

  1. Sensory integration – Stimulate more of the senses:

  • Our senses work together so it is important to stimulate them! Your head crackles with the perceptions of the whole world, sight, sound, taste, smell, touch.

  1. Vision – Vision trumps all other senses:

  • We are incredible at remembering pictures. Hear a piece of information, and three days later you'll remember 10% of it. Add a picture and you'll remember 65%.

  1. Gender – Male and Female brains are different:

  • What’s different? Mental health professionals have known for years about sex-based differences in the type and severity of psychiatric disorders. Males are more severely afflicted by schizophrenia than females. By more than 2 to 1, women are more likely to get depressed than men, a figure that shows up just after puberty and remains stable for the next 50 years. Males exhibit more antisocial behavior. Females have more anxiety. Most alcoholics and drug addicts are male. Most anorexics are female.

  • Men and women handle acute stress differently. When researcher Larry Cahill showed them slasher films, men fired up the amygdale in their brain’s right hemisphere, which is responsible for the gist of an event. Their left was comparatively silent. Women lit up their left amygdale, the one responsible for details. Having a team that simultaneously understood the gist and details of a given stressful situation helped us conquer the world.

  1. Exploration – We are powerful and natural explorers:

  • The desire to explore never leaves us despite the classrooms and cubicles we are stuffed into. Babies are the model of how we learn—not by passive reaction to the environment but by active testing through observation, hypothesis, experiment, and conclusion. Babies methodically do experiments on objects, for example, to see what they will do.

This is a great book that is well written and full of facts and solid information.  I highly recommend this book for everyone (business people, teachers, parents…).

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by Scott Heintzelman - Scott is a CPA, CMA and CFE living in Pennsylvania. Scott is a partner serving on the executive team at McKonly & Asbury LLP, a regional accounting firm with multiple offices in the Mid-Atlantic. The firm has been an IPA ALL-STAR as well as winning Best Places to Work in Pennsylvania for numerous years.

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