Final answer:
The assertion that dreams uniformly hold existential messages and integrate aspects of the self is false due to the wide range of interpretations about dreams in psychological theories.
Step-by-step explanation:
The statement "Dreams contain existential messages, and each piece of dream work leads to assimilation of missing parts of the self" . Dream interpretation and significance are subjective and vary based on different psychological theories.
While analysts like Freud and Jung considered dreams to be rich with symbolic meaning and introspective insights into the unconscious, viewpoints differ among experts. Freud's theory centered around the manifest and latent content of dreams, suggesting they reveal unconscious desires and motivations. Jung, however, expanded this perspective to include the collective unconscious and archetypes, which he said echo through cultures and personal growth. Yet, others like neuroscientist Alan Hobson argue for a more biological basis, seeing dreams as the brain's way of organizing and synthesizing information during sleep, without inherent symbolic meaning. This diversity in interpretations demonstrates that dreams might not universally contain existential messages or lead to the assimilation of the self as the statement proposes.