Final answer:
Sigmund Freud proposed that dreams function as a form of wish fulfillment, providing insight into the unconscious mind with their latent and manifest content. However, Freud's dream analysis has been criticized for being too subjective and lacking scientific rigor.
Step-by-step explanation:
The individual who said dreams are a disguised form of wish fulfillment was the Austrian psychiatrist Sigmund Freud. Freud believed that dreams are a means to access the unconscious and that they represent wish fulfillment. He introduced the concept of the manifest content and the latent content of dreams, where the manifest content is the literal storyline and the latent content is the hidden psychological meaning. Freud analyzed dreams to help his patients discover their unconscious desires and deal with psychological issues.
However, Freud's theories have faced criticism over the years. One of the criticisms is that this theory can be seen as subjective and difficult to test scientifically. Many of Freud's concepts rely on interpretation, which can vary significantly from one therapist to another, making them challenging to validate empirically.