How Does The Mind Work?
How the mind works has been a matter of discussion, heated discussion, for centuries. With modern technology we now know how the basic unit of the brain, the neuron, works but still we have no idea how the brain thinks. Indeed there are psychologists who argue that there is no such thing as creative though. So this article will describe how the brain works and some practical steps we can take to improve our thinking process.

Now a neuron is quite simple; it is very similar to a simple light switch, either on or off. The diagram shows a representation of a neuron. The important thing to note is that a neuron is designed to connect with other neurons. The dendrite is the input to the neuron, and the terminal is the output. When the neuron detects inputs on a sufficient number of dendrites the neuron will fire. When the neuron fires all the terminals send out a signal. Say you see danger, such as a lion, there will be neurons in the brain whose job is to recognise a lion. These neurons do not need to see a complete lion, they can put together a little bit of brown fur, maybe some teeth. So these lion neurons are connected to neurons that recognise brown fur and neurons that recognise teeth. So when enough brown fur neurons and teeth neurons fire the lion neuron will fire, in other words the lion neuron has recognised a lion. Now, if only the brown fur neurons fire and not the teeth neurons then the lion neuron might not fire. The next stage of the process starts. These lion neurons might be connected to neurons that control the leg muscles. When the leg muscles neurons receive inputs from the lion neurons the legs start to move; the person runs away. Now this is very simplistic but it demonstrates how neutrons work. Neutrons work by simply passing messages, on-off messages, from one neuron to another. So neurons can only work when connected in a network. In fact a neuron network is also simple; it can easily modelled by a computer, even a simple spreadsheet can model a limited number of neurons. The question is ‘if a neuron is so simple why do we have such trouble understanding how the brain works’?
To date no one has come up with a complete explanation of how a neuron can think, but there are two schools of though. Firstly, neurons operate in a network; if an individual neuron cannot think there must be something fundamentally different about a network of billions of neurons. For some reason, and we do not know what that reason is, a network of a billion neurons can think where as an individual neuron can’t. It is possible to develop computer programs comprising of many thousands of virtual neurons, not billions but thousands. Now these computer programs have been somewhat successful but you would not consider these computer programs as being able to think; to date Artificial Intelligence is some way off. However, they do suggest that it if the number of virtual computer neurons were increased to many billions then these computer programs might be able to think. However creating computer programs that big is simply not possible for now and still, nobody knows how many virtual neurons would be required for a computer to think or even why more neurons would make a difference in the first place. But we know a brain can think so the answer must have something to do with a network effect. Or does it?
There are psychologists who have come up with a radical answer, that creative though does not really exist. What we perceive as creative though is just simple programming of the brain. So your unique genetic material combined with a lifetime of experience and learning means that you will react to any situation in a specific and predictable fashion. In the same way a computer is programmed. Of course human genetic material is very complicated and every human has slightly different experiences in growing up and therefore the range of predictable human behaviours to any one single event would be truly vast. To test this theory would also be extremely difficult. You have to get two identical twins, separate them at birth and bring them up in a totally controlled environment; you would have to re-run The Trueman Show by two. Most people would find it is difficult to believe that a fairly non-descript Swiss physics teacher working in a fairly non-descript patent office and one day comes up with the formula E=MC² is not a case of original though. However at this stage the idea that we are simply programmed machines is very attractive. Otherwise you have to attribute something magical to the neuron.
What is clear is that the connections in the brain are not permanent. Neuron connections and the neurons themselves are continuously being pruned and new ones being created. It takes a lot of energy and resources to maintain all these neurons and connections and if any neurons are not being used then those resources are directed elsewhere. As an example, you might have been a good sprinter when you were a youngster but now in older age you don’t run at all, all those neurons that drove your leg muscles will be pruned. It is like removing the spark plugs from a motor. Likewise your daily habits are constantly building more connections in the brain. If you get out of the right hand side of the bed in the morning, the get-out-of-bed-on-the-right-hand-side neurons will be building up connections to your muscles. You will be stronger getting out of bed on the right hand side than the left hand side. Of course in the example of getting out of bed the difference will be so small you will not be able to notice it. But beware there are areas where this pruning and rebuilding process can make a big difference.
Let’s say you are one of the many people who do not like going to work on Monday mornings, you get out of bed and say ‘its Monday morning I don’t like going to work’. By indulging in this habit you are physically changing your brain; you are reinforcing all those negative connections in your brain. If you were to say ‘its Monday morning I can’t wait to get to work and tell everybody about my wonderful weekend and all the things I am going to achieve at work this week’ (a bit cheesy I know, but anyway) you are reinforcing all the positive connections in your brain. This is why it so important to set goals and work towards achieving those goals, because you will be physically changing your brain for the better. Now let’s say you want to study hard to pass an exam. If you have never studied before but you regularly set goals and achieved them, even goals that are totally unrelated, such as running a half marathon, you will be more likely to study hard and pass the exam. You will literally have more achievement neurons in your brain. So whether your goals are keeping the house clean, being more punctual, eating more carrots, it doesn’t matter, setting and achieving goals will build a healthier brain for you.
Now, let’s explore a similar but slightly different concept ‘priming’ and we use the example of the lion again. The process of running away from a lion as it was explained above was a little simple; there would be many hundred of layers of neurons involved. When we see something neurons connected to the eyes convert what we see into a format that the brain can understand. So we don’t see a lion’s tooth per se; what we see is something that is white, so a series of neurons that detect colour react to the white colour of the tooth. Similarly, there will be a series of neurons that detect shapes, so when we see the lion’s tooth there will be a series of neurons that react to the sharp pointed shape of the tooth. The process continues with other features of the tooth being detected, such as the smooth enamel surface. So all these neurons detecting colour, shape and texture will be connected to neurons that detect teeth. Now just because you see something with teeth doesn’t mean you are looking at a lion; dogs have teeth, crocodiles have teeth. Sure the teeth sensing neurons will be connected to the lion detecting neurons, but the lion detecting neurons will also be connected to many other types of neurons. Let’s say lion are most active in the morning and night and lions prefer to hunt on grassy plains, say. So the lion detecting neurons will be connected to time-of-day neurons, lion-country neurons and as suggested above brown fur neurons. There is a set pattern to how these neurons must fire. When we look at something, say a lion, a wave of activity happens in our brains; colour, shape texture neurons are the first to activate, then teeth, fur and other neurons will activate. The next wave will be animal detecting neurons, followed by muscle activate neurons. This is the so-called spreading activation model.
So, one of the implications of the spreading activation model is that your brain can be primed to react in certain ways. If you are out in lion country in the early morning (remember lion hunting time) your lion detecting neurons will already be receiving lots of signals; if you see a flash of brown fur in the deep grass you are much more likely to interpret that as a lion. I have deliberately used a lion in these examples as a lion represents danger. Now if you are out in lion country in the early morning a flash of brown fur in the long grass could equally be a gazelle, after all this is what the lions are hunting and a gazelle would also be food for humans. So why would be more likely to interpret the flash of brown fur as a lion rather than a gazelle, because danger signals will override a food signals in the brain. Over thousands of years humans who mistook a gazelle for a lion missed on lunch, humans who mistook a lion for a gazelle became lunch.
Now in our modern world we do not see lions but are brains are still primed to react in certain ways. So on Monday mornings when we don’t want to go to work our brains are primed to be very negative. All the I-don’t-want-to-do-anything neurons are firing away slowing us down and making every task harder. Notice that we evolved on the plains of Africa, where there were lions and many other dangers, so we are sort of programmed to handle great danger. Unfortunately in our modern world many of the processes that are in place to deal with great dangers like lions kick in when we miss the bus. However, we can also prime our brains for positive results. You will often hear sport coaches telling their athletes to visual what a good tennis serve or soccer goal kick would look like; this is because all the neurons that are needed to pull off a good tennis serve or soccer goal kick are being primed when we visualise a good result.
So the final message is if you want to build a better brain, try to plan, visualise and achieve challenging tasks.