A Contribution to the Free Will Existence Problem

Life reacts to its needs and the environment. We describe the basics of these reactions and the evolution of the neural system of the organisms. More complex central nervous systems offer new ways of reaction for the animals. The human brain has some properties, such as perception of self, consciousness as well as ability to generalize our knowledge with concepts, which can be manipulated with abstract thinking and language. Do these properties allow us to do or not to do something and consequently to have free will? We try to put the problem of free will on a scientific basis. We thus offer experimental evidence that decisions do exist under certain circumstances and consequently that free will exists.