Subconscious, also known as unconscious, refers to those things that can't be transformed into consciousness at all under normal circumstances, such as desires that are suppressed in the deep heart and can't be realized. It is the so-called "iceberg theory": the composition of human consciousness is like an iceberg, only a small part (consciousness) is exposed to the water, but most of it is hidden underwater, which has an impact on the rest (unconsciousness). Freud believed that the unconscious has a dynamic role, which actively exerts pressure and influence on people's character and behavior. Freud applied the principle of determinism in exploring the spiritual field of human beings, and thought that everything happened for a reason. It seems that trivial things such as dreaming, slip of the tongue and slip of the pen are all determined by potential reasons in the brain, but they are just expressed in disguise. Therefore, Freud put forward the hypothesis of unconscious mental state, which divided consciousness into three levels: consciousness, pre-consciousness and unconsciousness.
Defending the concept of "unconsciousness" We don't allow people to call it "subconscious" or "subconscious", which is wrong and easy to cause misunderstanding. The so-called unconsciousness, on the one hand, includes all kinds of activities that are temporarily unknown to consciousness because of lurking, and everything else is the same as conscious activities, on the other hand, it also includes all kinds of activities that are "suppressed". If these activities become conscious activities, they will be in sharp contrast with other activities in consciousness.