Medina’s 12 Brain Rules

Taken from his book Brain Rules.  All content is Copyright © 2008 by John Medina.  You may also want to check out [although at this current moment it is down for me]


Brain Rule #1: Exercise boosts brain power (Medina, 2008)

· Our brains were built for walking—12 miles a day!

· To improve your thinking skills, move.

· Exercise gets blood to your brain, bringing it glucose for energy and oxygen to soak up the toxic electrons that are left over. It also stimulates the protein that keeps neurons connecting.

· Aerobic exercise just twice a week halves your risk of general dementia. It cuts your risk of Alzheimer’s by 60 percent.

Brain Rule #2: The human brain evolved, too. (Medina, 2008)

· We don’t have one brain in our heads, we have three. We started with a “lizard brain” to keep us breathing, then added a brain like a cat’s, and then topped those with a thin layer of Jell-O known as the cortex—the third, and powerful, “human” brain.

· We took over the Earth by adapting to change itself, after we were forced from the trees to the savannah when climate swings disrupted our food supply.

· Going from four legs to two to walk on the savannah freed up energy to develop a complex brain.

· Symbolic reasoning is a uniquely human talent. It may have arisen from our need to understand one another’s intentions and motivations, allowing us to coordinate within a group.

Rule #3: Every brain is wired differently (Medina, 2008)

· What you do and learn in life physically changes what your brain looks like—it literally rewires it.

· The various regions of the brain develop at different rates in different people.

· No two people’s brains store the same information in the same way in the same place.

· We have a great number of ways of being intelligent, many of which don’t show up on IQ tests.

Rule #4: People don’t pay attention to boring things. (Medina, 2008)

· The brain’s attentional “spotlight” can focus on only one thing at a time: no multitasking.

· We are better at seeing patters and abstracting the meaning of an event than we are at recording detail.

· Emotional arousal helps the brain learn.

· Audiences check out after 10 minutes, but you can keep grabbing them back by telling narratives or creating events rich in emotion

Rule #5: Repeat to remember. (Medina, 2008)

· The brain has many types of memory systems. One type follows four stages of processing: encoding, storing, retrieving and forgetting.

· Information coming into your brain is immediately split into fragments that are sent to different regions of the cortex for storage.

· Most of the events that predict whether something learned also will be remembered occur in the first few seconds of learning. The more elaborately we encode a memory during its initial moments, the stronger it will be.

· You can improve your chances of remembering something if you reproduce the environment in which you first put it into your brain.

Rule #6: Remember to repeat. (Medina, 2008)

· Most memories disappear within minutes, but those that survive the fragile period strengthen with time.

· Long-term memories are formed in a two-way conversation between the hippocampus and the cortex, until the hippocampus breaks the connection and the memory is fixed in the cortex—which can take years.

· Our brains give us only an approximate view of reality, because they mix new knowledge with past memories and store them together as one.

· The way to make long-term memory more reliable is to incorporate new information gradually and then repeat it in timed intervals.

Rule #7: Sleep well, think well. (Medina, 2008)

· The brain is in a constant state of tension between cells and chemicals that try to put you to sleep and cells and chemicals that try to keep you awake.

· The neurons of your brain show vigorous rhythmical activity when you are asleep—perhaps replaying what you learned that day.

· People vary in how much sleep they need and when they prefer to get it, but the biological drive for an afternoon nap is universal.

· Loss of sleep hurts attention, executive function, working memory, mood, quantitative skills, logical reasoning, and even motor dexterity.

Rule #8: Stressed brains don’t learn the same way. (Medina, 2008)

· Your body’s defense system—the release of adrenaline and cortisol—is built for an immediate response to a serious but passing danger; such as a saber-toothed tiger. Chronic stress, such as hostility at home, dangerously deregulates a system built only to deal with short-term responses.

· Under chronic stress, adrenaline creates scars in your blood vessels that can cause a heart attack or stroke, and cortisol damages the cells of the hippocampus, crippling your ability to learn and remember.

· Individually, the worst kind of stress is the feeling that you have no control over the problem—you are helpless.

· Emotional stress has huge impacts across society, on children’s ability to learn in school and on employees’ productivity at work.

Rule #9: Stimulate more of the senses at the same time. (Medina, 2008)

· We absorb information about an event through our senses, translate it into electrical signals (some for sight, others from sound, etc.) disperse those signals to separate parts of the brain, then reconstruct what happened, eventually perceiving the event as a whole.

· The brain seems to rely partly on past experience in deciding how to combine these signals, so two people can perceive the same event very differently.

· Our senses evolved to work together—vision influencing hearing, for example—which means that we learn best if we stimulate several senses at once.

· Smells have an unusual power to bring back memories, maybe because smell signals bypass the thalamus and head straight to their destinations, which include that supervisor of emotions known as the amygdala.

Rule #10: Vision trumps all other senses. (Medina, 2008)

· Vision is by far our most dominant sense, taking up half of our brain’s resources.

· What we see is only what our brain tells us we see and it’s not 100 percent accurate.

· The visual analysis we do has many steps. The retina assembles photons into little movie-like streams of information. The visual cortex process these streams, some areas registering motion, others registering color, etc. Finally, we combine that information back together so we can see.

· We learn and remember best through pictures, not through written or spoken words.

Rule #11: Male and Female brains are different. (Medina, 2008)

· The X chromosome that males have one of and females have two of—though on acts as a backup—is a cognitive “hot spot”, carrying an unusually large percentage of genes involved in brain manufacture.

· Women are genetically more complex, because the active X chromosomes in their cells are a mix of Mom’s and Dad’s. Men’s X chromosomes all come from Mom, and their Y chromosome carries less than 100 genes, compared with about 1,500 for the X chromosome.

· Men’s and women’s brains are different structurally and biochemically—men have bigger amygdala and produce serotonin faster, for example—but we don’t know if those differences have significance.

· Men and women respond differently to acute stress: Women activate the left hemisphere’s amygdala and remember the emotional details. Men use the right amygdala and get the gist.

Rule #12: We are powerful natural explorers.  (Medina, 2008)

· 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.

· Specific parts of the brain allow this scientific approach. The right prefrontal cortex looks for errors in our hypothesis (“The saber-toothed tiger is not harmless.”), and an adjoining region tells us to change behavior (“Run!”).

· We can recognize and imitate behavior because of “mirror neurons” scattered across the brain.

· Some part of our adult brains stay as malleable as a baby’s, so we can create neurons and learn new things throughout our lives.

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