Transcript

Did you always think that learning was due to the addition of new cells in the brain?

Then you're not the only one. Researchers found that approximately 82% of preservice teachers thought the same or did not know how learning in the brain works. Well, actually, this is not true, and this is what we call a neuromyth. In this video, we will therefore explain the real neuroscience behind learning. Learning is due to the creation of new and mostly more efficient connections between brain areas. But how does this work? Exactly?

To understand how learning occurs in the brain, we need to start with the basics. Our brain consists of billions of neurons. These neurons have dendrites which receive information and an axon which sends information. Neurons communicate with each other via electrical and chemical signals. Transmission within a neuron is electrical, and this is called an action potential.

Transmission between neurons is chemical, and appears at tiny gaps called synapses. Once an action potential reaches the presynaptic neuron, neurotransmitters are released in a synapse and received by the postsynaptic neuron. When we are learning something, neurons in different parts of the brain communicate with each other. If two neurons frequently interact, they form a connection that allows them to transmit messages more easily and accurately. We will further explain this with a learning example and an analogy.

Let's say you would like to learn to play the piano. When playing the piano, different brain areas are involved, such as the motor, auditory and visual cortex. Before you start to learn how to play the piano, the pathways between these brain areas are still very weak, and playing the piano doesn't sound really nice. At this stage, you can compare your brain to a forest without any trails. When you start practicing the piano, it feels very difficult, just like walking through a forest without a trail is difficult because you have to push the vegetation out of the way to walk through.

However, the more you practice the piano, the stronger the connections between the involved neurons in the brain areas get, which leads to faster and more efficient signals, just like in the forest, the more you use the same trail, the easier the walk becomes. When you have not played the piano in a long time, the connections between the evolved brain areas weaken, and so do your piano skills, as in the forest, when you stop using the trill, the vegetation grows back and the trill slowly fades. However, when you have mastered playing the piano, the connections between the neurons have become so strong that it doesn't matter that you haven't played in a while. I just like in the forest, if you have a strong trail, the vegetation is not able to grow back on again. Thus, when we learn something new, our brains do not produce new cells, but rather, the brain creates new and mostly more efficient connections between neurons in different areas of the brain.