The physiological theories of dreaming discuss how the brain processes information, and how it manifests as a dream. Some theories believe that dreams are simply the result of trying to make sense of the high amounts of cortical activity. Theories under this realm believe that dreams come from the brain's attempt to interpret cortical activity, or that dreams help forget unnecessary information. Another part of this theory is that dream helps aid memory, and consolidate things that were previously experienced.
The psychodynaimc theory of dreaming follows Freud's ideas that dreams are meaningful and the major function of dreams is wish fulfillment. Dreams, under this theory, contain deep desires and needs which are buried in the unconscious.
Cognitive theories of dreaming cover the ideas that dreams have important psychological functions, and they help people solve ongoing problems they face. Dreams relate to the status of our ongoing needs and dreams function to assimilate new data and reorganize related memories.
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