A person who experienced a deeply traumatic event in childhood has no conscious recollection of the incident. However, as an adult, they find themselves unable to form close, trusting relationships, a behavior they cannot explain. According to the principles of psychoanalytic thought, which of the following best explains this situation?

An individual has an intense, unexplainable fear of enclosed spaces and actively avoids elevators and small rooms. They have no conscious memory of any negative experiences in such places. Later, through therapy, a deeply buried and forgotten childhood memory of being accidentally locked in a closet is uncovered. Which mental process best explains why this traumatic memory was not consciously available to the individual?