Human emotions play an important role in attention, memory, reasoning, and other forms of thinking. More and more scientists are recognizing this connection in the hope of understanding the mechanisms behind mental disorders.

You have a friend who is very funny, tells many stories that make you laugh. You feel happy every time you hear something good. However, there are times when you suddenly feel sad or angry? You wonder: why do your emotions change? What caused that? The answer is our brain. So how does the brain control our emotions?