Of the theories of the function of dreaming mentioned in the text, the activation-synthesis theory is probably the MOST:

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The activation-synthesis theory, which suggests that dreams are a result of random neural activity in the brain that is then interpreted by the brain as a coherent story, is primarily a biological theory. It is based on the physical and chemical processes that occur in the brain during sleep and dreaming.

Of the Theories of the Function of Dreaming Mentioned in the Text