Answer
**Freud's psychological theories were significantly influenced by the ideas of James George Frazer, a Scottish anthropologist and folklorist.** Frazer's groundbreaking works, particularly "The Golden Bough," explored the evolution of religious beliefs and practices, emphasizing the importance of rituals, magic, and myths in human culture. Frazer's insights provided a foundation for Freud's exploration of the subconscious mind, dream interpretation, and the role of primitive instincts in human behavior.