Oxytocin was the hormone used. The study hypothesized that based on the level on empathy found in a person and the affects of the oxytocin would reveal the interpersonal distance among a group of people
The study by Anat Perry, David Mankuta, and Simone G. Shamay-Tsoory investigated how Oxytocin (OT) affects interpersonal distance preferences in relation to empathic abilities