Brain Rule #3: Wiring

In this next installment of my discussion of Dr. John Medina's fabulous book Brain Rules, we'll take a look at how and why every brain is unique. Dr. Medina's rule is "Every brain is wired differently."

You can imagine the brain as a huge intercontinental road map, with millions (billions?) of pathways for transmitting information. There are tiny back roads where hardly anyone ever goes, city streets and two-lane highways, and massive interstate freeways. The larger routes don't just accommodate more traffic, they also have a higher speed limit - allowing messages to travel more rapidly along them. Information routes in the brain become larger and faster the more they are used, so the skills and knowledge that you use regularly have the fastest and strongest connections in the brain.

The interesting thing is that no two brain maps are the same. Although the major highways are in more or less the same places from person to person, the smaller routes differ, and the smallest ones can be totally unique to each person. Everyone's brain map is distinctly their own.

Whenever a person learns something new, he or she forges a new pathway in the brain. Neurons split and make a new connection. The brain changes; it rewires itself. The new pathway is negligible at first - like a few footprints in the grass - but if it is used repeatedly, it will become larger, deeper, and faster. In this aspect, the brain acts like a muscle: the more activity you do, the larger and more complex it can become. So repetition is as central to learning as it is to weight lifting. Learners need to repeat, repeat, repeat in order to lay down strong pathways in the brain.

This process of forging new pathways and then strengthening them is what teaching and learning are all about. When we teach our learners something new, and then help them master it through meaningful repetition, we are helping them rewrite the road map of their brains.

Because every brain is wired in a unique pattern, each learner's needs are also unique. Everyone learns at a different pace and has different associations and networks in the brain to build on, and thus will master complex material to a different depth in a given period of time. Even if every learner starts out in roughly the same place at the beginning of a lesson (which is itself unlikely), they will not end up in the same place by the end of the lesson. There is no such thing as a homogeneous classroom.

So what does this tell us? For one thing, class sizes really do matter. Since each learner is unique, one of the teacher's most important responsibilities is keeping track of where each learner is at. This is much easier to do when there are fewer people to keep track of! In order to perform well at this job, a teacher must be highly adept with Theory of Mind skills (which we learned about in the last chapter). That's because a teacher relies on the subtle mental and emotional signals being broadcast by the learners to "get a feel" for who understands what, who's frustrated, who's confused, who's made a good analogy, who's got a mistaken understanding, who's off-task, who's bored, who's excited, etc. In a crowded classroom, too many signals get lost, and the teacher runs the risk of losing students - the proverbial problem of people "falling through the cracks". In a classroom with fewer learners, the teacher can more easily pick up on signals from everyone and make sure she is keeping everyone on track.

One other thing this tells us is that differentiated or customized instruction is not only beneficial but may in fact be necessary if we are to achieve high quality outcomes for learners. One way this might be done is through software programs that can diagnose the gaps in a particular learner's knowledge and then guide the learner to improve in those areas. This has been done with reading skills software and has proven very effective. Students in a class all get the same lesson from the reading teacher, but then also have a chance to work independently on computers. The computers have adaptive software that assesses their reading skills and then targets their areas of weakness. The difficulty of course, is in developing high quality, engaging, educational adaptive software. It's not that it can't be done - it just that it's going to cost money and time: two things educators never seem to have enough of.

Brain Rule #2: Survival

In this next installment of my discussion of Dr. John Medina's fabulous book Brain Rules, we'll take a look at how we survived by using our brains. Dr. Medina's rule is "The human brain evolved too." You might think of this chapter in the book as a lesson in "Survival of the Brainiest".

This chapter has a ton of good information about the brain, how it is structured, and how it works. I personally find it fascinating, but I know it's not for everyone. And it's probably less relevant to teachers than some of the other content, so I'll focus on just two aspects of this chapter that really have something to say about teaching and learning.

First, the best theories of human evolution and survival indicate that human beings evolved in a challenging world of environmental change, and the reason that we prospered (where other species went extinct) was that we adapted to deal with variation (change) rather than adapting to a single, stable environment. The adaptation that allowed us to deal with the unpredictability of the world was the development of two separate brain systems: one that stores a fund of knowledge (a sort of database of everything we know about the world), and the other a capacity for improvising off that knowledge the way a jazz musician improvises off a musical score. The first system allows us to know when we have made a mistake, and the second allows us to learn from that mistake and try something different.

In classrooms, we need to deal with both systems if we are to tap into our learners' best abilities. It's not enough to transfer some information from teacher to student; the students need to apply that information in a creative or novel way. They need to solve problems that are relevant and interesting to them by making use of the new information. It's in this application stage that the new information is really integrated into the learners' fund of prior knowledge. It's not enough to just do the creative application and problem solving work, either - learners need their teachers to provide the information to build up their database.

In order for teachers to communicate information to learners, they need to be experts in another uniquely human adaptation: the Theory of Mind. Theory of Mind allows us to understand - to intuit - the emotions and inner lives of others. Dr. Medina uses this example:

Read these two sentences:
The husband died. Then the wife died.
How much do you know about these two people?

Now read these two sentences:
The husband died. Then the wife died of grief.

Everything that you can now intuit about these two people, their relationship, and their emotional lives comes from your skill in Theory of Mind. We use Theory of Mind constantly to navigate our complex human relationships. It comes so naturally and is so pervasive in our thinking that it affects everything we do, including teaching and learning. Everything we learn and everything we know is colored by how we feel about it and how we think others feel about it.

As every wise teacher knows, teaching and learning are rooted in relationships. Learners need to feel safe and feel connected to (understood by) their teacher. Without the feeling of safety, learners don't take the intellectual risks that allow them to improvise off new information (and thus truly understand it). Teachers need to be able to gauge and react appropriately to the emotional state and emotional needs of the learners: they need to be experts in Theory of Mind.

You'll see more of why Theory of Mind is so important for teachers in the next chapter. For now, I'll summarize by saying that the human brain evolved to be an efficient learning machine, because learning new things kept us alive in an unpredictable and dangerous world. Our mental software gives us several powerful tools for learning, but our ability to use them is dependent on human relationships and emotional connections.

Brain Rules: Rule #1: Exercise.

I recently read an absolutely fantastic book called "Brain Rules: 12 Principles for Surviving and Thriving at Work, Home and School," by Dr. John Medina, a brain scientist and director of the Brain Center for Applied Learning Research at Seattle Pacific University. (Get more info at http://www.brainrules.net/). So much of the information in this book is relevant to teachers-and in many cases, confirms what savvy practitioners have seen for years in their classrooms-that I have been inspired to (re)share it with the world. Or, at least that small sampling of the world that reads this blog. I'll try to summarize one rule each (one chapter of the book) in a series of 12 posts to this blog.

I'll start with Rule #1: Exercise. It's probably the easiest rule to explain and to understand, and it really connects with common sense. The rule is: Exercise boosts brain power.

To think well, we need to move. Our bodies and brains evolved to exist in nearly constant motion. A sedentary lifestyle just ruins our ability to think and learn. If you want one simple way to improve your students' performance, get them up out of their chairs and moving. Even low impact exercise (walking or bouncing up and down on an exercise ball) can produce major improvements in creative thinking, attention and memory - and thus learning. Studies with children have shown that simply adding physical activity to a school routine improves outcomes in core content areas (reading, math, etc.). 30 minutes playing dodgeball may actually do more to improve kids' math scores than 30 extra minutes working word problems. Obviously, you have to have the lessons too. But exercise releases chemicals in the brain that make the lessons stick.

This doesn't just apply to children. To remain life-long learners, exercise is key. It wards off dementia and can halt or even reverse age-related declines in mental performance. In educational settings, there is every reason to believe that adults' brains benefit just as much from exercise as kids'.

One reason for the improvement in mental function among elders may be that exercise encourages the brain to grow new neurons. Yes! That old idea that we are born with all the brain cells we will ever have (and simply proceed to lose them as we age) is just plain wrong. You can grow new brain cells, and exercise might be the best way to release the chemicals that will set that process in motion. At the very least, regular exercise significantly reduces the chance of stroke. And stroke, if it doesn't kill, can cause serious brain damage.

The long and the short of it: sitting still in a chair is not a good brain environment for attention, memory, thinking, or learning. Get your students up and about! A parked butt signals a fuzzy brain.

And on that note, I think I'll go for a brisk walk around the office before turning my attention to my next project!