So how do neurons communicate with each other and why is this important in terms of how well we work? Imagine a couple of islands separated by some water. Each island has its own stranded inhabitant who communicates with the other islander by placing messenger bottles in the water and then waits for them to wash up on his neighbours’ shores. In a similar way the neurons ‘talk’ to each other by sending little packets of chemical ‘bottles’ across tiny gaps that separate them from their neighbours. The area right behind the forehead is extremely sensitive to two main messenger bottles. Too few or too many of certain types of bottles basically causes this area to close down. The relationship between these chemical bottles and its performance is so connected that you can see the effect in a simple diagram.