Synesthesia can be defined simply as the mixing of senses within a individual. By mixing, I mean interchanging, or you can think of it as replacing. It's when people experience crossing sensations such as having the ability to taste colors, or being able to see colors when they hear sounds. This can vary depending on the condition and severity of Synesthesia within a person. For example, if a person looks at this picture with synesthesia, they will see colors for the numbers, and can easily differentiate the 5 and the 2.
This condition is very important, because it can explain many different theories and concepts, such as the process of Sensation and Perception. To simplify things, Sensation picks up what we receive from our environments, and Perception is how our brain processes that information. But what about Synesthesia? Why do we feel cold when we see something so irrelevant such as a table? Why do we see the number 5 and think of a color? There's a neurological explanation, "When you were born, you had far more brain cells than you needed. A period of pruning happens where only the connections and brains cells you need and use survive. This is a normal and vital part of all mammals' early development. " This is important to understand, because we can use this information to help solve this kind of problem, and it could possibly be a link to other neurological problems. As we see in this link, http://www.youtube.com/watch?v=veoN1mh7RME , this young adult interchanges color with shapes and different words, letters, and even numbers! He states that it is a "feeling thing". This impacts his daily life because everything he does such as play music, it reminds him of color. This could help him remember things more clearly, or simply play better music with more feeling. But should this be cured? Is there a way to cure this? This is a good example of an article explaining synesthesia that can be disproved http://synaesthesia.com/en/information/syn-bewusstsein/, If you look at the video, it's promoting inattentional blindness, it's not a test showing that you have synesthesia. If that was the case, then most people would have synesthesia, and the ratio for people who have synesthesia wouldn't be 1/2500, it would be higher... This promotes the principle Occam's Razor, and Ruling out Rival Hypothesis, because there's a simpler explanation, and the claim was ruled out by scientific evidence ( the ratio of synesthetic people). In this case, ruling out rival hypothesis is the most important rule of principle to follow.