 The year is around 400 BC in ancient Greece. Hippocrates, who will soon be known as the father of medicine, is thinking deeply about an important question. Why do people behave like they do? What makes us who we are? Since he was a physician, his first instinct was to look at the body for an answer. And that's when he got the idea. Human behavior is caused by four fluids in the body. He called those fluids, humors. Blood, yellow bile, black bile, and phlegm. A few centuries later, a fellow physician named Galen was intrigued by Hippocrates' ideas. So he built up on it and proposed the first categorization of human behavior and temperament. He believed the four fluids affected the person's behavior, creating four types of temperament. Cholaric, melancholic, sanguine, and phlegmatic. Are you interested to hear what ancient doctors would say about your personality? Which of the four temperaments are you? Keep watching to find out. 1. Cholaric A cholaric temperament corresponds to the fluid of yellow bile. Cholaric people are described as angry, tense, and hot-headed. They're constantly searching for excitement and success, which can make them easily annoyed and controlling. They like it when things are going their way and may seem opinionated to others. According to some new research, cholarics can also be highly emotional. A 2022 research paper studied Chinese students and how they adapted to online learning. Researchers found that students with a cholaric temperament were sensitive and prone to fluctuating emotions. They seemed to be affected by changes and had a harder time adopting to online learning environments. But those with a cholaric temperament have their positive sides too. They are result-oriented, active, and positive. They are not afraid of any obstacles coming their way. They show great confidence and strive for independence. Other people may be impressed by a cholaric's quick thinking and strong willpower. Risk-taking is something they enjoy, and they can't stand when things are moving too slow. 2. Melancholic Melancholic is the personality of an individual characterised by black bile. Melancholic are extremely introverted and prefer to have just one or two close friends. They are very thoughtful and considerate, which actually makes people like them. Melancholic personalities are artistic souls. They pour their hearts out in poetry, paintings, or music. Even though they're very talented, they are also perfectionists and often find flaws within their work and themselves. As the word Melancholic suggests, they can be pretty sensitive. Sometimes they get overwhelmed with the tragedies of the world. Due to this emotional nature, they are prone to depression or anxiety. A paper published in the Journal of Effective Disorders suggests that the melancholic temperament might also play a role in bipolar disorder. 3. Sanguine Blood is a sanguine's main body fluid. People with a sanguine personality type tend to be lively, optimistic, and carefree. They are the first to start a conversation or shake your hand. Their glass is always half full. They prefer to see the bright side of life and live to the fullest. They have a great sense of humour and love to make others laugh. But because they love having fun so much, they are typically poor at tolerating boredom and will seek variety and entertainment. Unfortunately, this trait can sometimes negatively affect their romantic and other relationships. They also tend to seek attention and need constant reassurance from others. This temperament type is very similar to a certain personality trait that is being researched today. Do you know which trait that is? Hint. If you're not sure, check out this video to find out. This video is made for educational purposes only. It's meant to be a fun way for you to learn a bit about the history of personality psychology. It's not meant to assess your personality or make any diagnosis. Only a licensed psychologist can truly assess your personality, so please don't take this too seriously. 4. Flematic Flem is a fluid that influences the behaviour of a phlematic. A phlematic is best described as a people person. These people seek close relationships and are often loyal spouses and loving parents. People with phlematic temperaments tend to avoid conflicts at all costs. They believe a good life is a peaceful life. They're very much into charity and helping others, and they make great nurses, psychologists, or social workers. Flematics are almost always chill and relaxed, but that's not always a positive trait. They can often be apathetic and sluggish. They may seem like nothing bothers them much, like they're not really interested in things that are happening around them. A 2019 study shows that a person with this temperament can actually be a great driver. Researchers found that phlematic drivers have a low heart rate and low arousal level while driving. This means that in contrast with other temperaments, they rarely get road rage. It's also been found that phlematics have a higher tolerance for relatively simple and monotonous tasks. Because of that, they rarely engage in risky driving behaviour. So, what do you think? Which temperament describes you best? The personality research doesn't stop in ancient Greece. Many modern theories have tried to expand upon what Hippocrates and Galen thought of. Would you get the same results on Myers-Briggs personality types? Or even big 5 traits? If you want to know even more about yourself, watch these videos and find out.