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Between January and September 2012, the researchers randomly assigned 80 healthy male volunteers to 40 IU of intranasal oxytocin or saline. The researchers and participants were blinded to study drug identity. After 45 minutes, placebo analgesia was assessed using the following standard technique. Two identical inert ointments were applied to 2 sites on each participant's forearm. The ointments were described as an anesthetic that reduces pain (placebo) and an inert control cream (control). In the 15 minutes following application that the participant expected the anesthetic to take effect, the researchers calibrated the intensity at which a 20-second painful heat stimulus was perceived by each individual to rate as a 60 on a scale ranging from 0 (no pain) to 100 (unbearable pain). During the subsequent test phase, a series of 10 of those calibrated stimuli was applied to each of the 2 sites in randomized order. The primary outcome was the placebo analgesic response, defined as the reduction of perceived pain intensity on the placebo site compared with the control site in the oxytocin and saline groups.
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