When psychoanalysis first arrived in the United States, most psychologists ignored it. By the 1920s, however, psychoanalysis had so captured the public imagination that it threatened to eclipse experimental psychology entirely. This article analyzes the complex nature of this threat and the myriad ways that psychologists responded to it. Because psychoanalysis entailed precisely the sort of radical subjectivity that psychologists had renounced as unscientific, core assumptions about the meaning of science were at stake. Psychologists' initial response was to retreat into positivism, thereby further limiting psychology's relevance and scope. By the 1950s, a new strategy had emerged: Psychoanalytic concepts would be put to experimental test, and those that qualified as "scientific" would be retained. This reinstated psychologists as arbiters of the mental world and restored "objective" criteria as the basis for making claims. A later tactic--co-opting psychoanalytic concepts into mainstream psychology--had the ironic effect of helping make psychology a more flexible and broad-based discipline.