The term derives from Freudian psychoanalysis. The story incorporates themes of Jungian psychology, Freudian thought, and religious symbolism. This view has to some extent supplanted its predecessor, Freudian Oedipal theory. In O'Neill's interpretation, these forces are eliminated in favor of Freudian and Jungian psychology. During this time he began questioning the Freudian approach to psychoanalysis. Steven Pinker considers Freudian theory unscientific for understanding the mind. He inspired new cross-fertilisation of Freudian and Marxist ideas. John Searle has offered a critique of the Freudian unconscious. A "slip of the tongue" refers to an unintentional utterance, such as a Freudian slip. C.F. Bentley reads Dracula as an embodiment of the Freudian id. Stemming from his Freudian philosophical basis, bodily urges are integral to Mailer's work. Linnie Blake argues this is an evocation of the uncanny in Freudian terms. Her theories questioned some traditional Freudian views. Each term is analogous to the concept of female penis envy presented in Freudian psychology. Freudian psychotherapists focused on patient's personalities.