Hormones and Decision Making

Inclusion Criteria: * males between 18 and 25 Exclusion Criteria: * recruitment will be limited to male participants between 18 and 25 years who have no current conditions that would preclude the use of testosterone. Specific exclusion criteria are: * women of all ages * males younger than 18 years and older than 25 years * self-report discomfort with ingestion of testosterone for the purpose of this study * body mass index lower than 18 or higher than 27 * prior diagnosis of major depression, posttraumatic stress disorder, phobia, anxiety disorder, or other psychiatric conditions * first-degree relatives diagnosed with a psychiatric disorder * presence of a medical condition that would preclude the use of testosterone * use of medications that would preclude the use of testosterone * consumption of more than 5 cigarettes a day * current use of testosterone enhancing products, such as gels, creams, and injections