When a French biotechnology company seeks patients in Buenos Aires with bipolar disorder for its gene discovery program, they have unexpected trouble finding enough subjects for the study. In Argentina, the predominant form of mental health expertise psychoanalysis does not recognize the legitimacy of bipolar disorder as a diagnostic entity. This problem points to a broader set of political and epistemological debates in global psychiatry. Drawing from an ethnography of psychiatric practice in Buenos Aires, Andrew Lakoff follows the contested extension of novel techniques for understanding...