Before getting down to such issue as the psychology of creativity, you need to understand what creativity really is. Well, defining creativity is not that simple which is the reason why there is no such thing as a general definition of creativity. Apart from that, all creative people are different. Their techniques differ as well.
Yet, there are several notions with the help of which it is easier to understand what creativity is all about. To begin with, something needs to be original in order to be creative. Thus, the idea has to be new. In addition, it also has to be functional. What it means is that it is important to be able to implement that idea in real life.
Apart from that, there is an obvious connection between the personality of a person as well as their level of creativity. The more unique the person is, the more likely they are to come up with some unusual ideas. Do not hesitate to read more about the psychology of creativity here …