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The unconscious mind (or the unconscious) consists of processes in the mind that occur automatically and are not available to introspection, and include thought processes, memory, affect, and motivation. Evidence suggests that unconscious phenomena include repressed feelings, automatic skills, subliminal perceptions, thoughts, habits, and automatic reactions, and possibly also complexes, hidden phobias and desires. In psychoanalytic theory, unconscious processes are understood to be expressed in dreams in a symbolical form, as well as in slips of the tongue and jokes. Thus the unconscious mind can be seen as the source of dreams and automatic thoughts (those that appear without any apparent cause), the repository of forgotten memories (that may still be accessible to consciousness at some later time), and the locus of implicit knowledge (the things that we have learned so well that we do them without thinking).
It has been argued that consciousness is influenced by other parts of the mind. These include unconsciousness as a personal habit, being unaware, and intuition. Terms related to semi-consciousness include: awakening, implicit memory, subliminal messages, trances,and hypnosis. While sleep, sleep walking, dreaming, delirium and comas may signal the presence of unconscious processes, these processes are not the unconscious mind itself, but rather symptoms.
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Scientists believe that it is the unconscious mind that controls our behaviour. In fact, neuroscientists have shown that as little as 5% of our cognitive activity daily is controlled consciously, while the rest is looked after automatically by our unconscious mind.
One of the processes which the unconscious mind controls is dreaming. Dreams are a succession of images, ideas, sensations and emotions that occur involuntarily in the mind during sleep. Although there has been some research into dreams, there is no single accepted theory for this hallucinogenic state. Some scientists say that dreams are random impulses from the brain stem, while others insist there is logic and meaning to our dreams, arising from the subconscious mind. Dreaming, however, is a largely automatic process for most people, as they tend to lack awareness while in this state.
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