Psychiatry Investig.  2020 Apr;17(4):292-298. 10.30773/pi.2019.0130.

Intranasal Oxytocin Increases Perceptual Salienceof Faces in the Absence of Awareness

• Xue SW
• Wu HB
• Zhang L
• Zhang DX

• KMID: 2500234
• DOI: http://doi.org/10.30773/pi.2019.0130

Abstract

Objective
The neuropeptide oxytocin has been found to improve human social cognition and promote prosocial behavior. However, it is still unclear about the mechanisms underlying these effects of oxytocin on neural processes, such as visual perception and awareness. Especially, it is still unclear whether oxytocin influences perceptual salience of social stimuli in the absence of awareness.
Methods
In a randomized double-blind, placebo-controlled trial we applied an interocular suppression paradigm and eye tracking
methods
to investigate the influence of intranasally administered oxytocin on perceptual salience of social stimuli. Suppression times and pupillometric data were measured during subjects being presented with gradually introduced pictures of social stimuli (neutral expression faces) or nonsocial stimuli (grayscale watch pictures) that were suppressed and invisible in 10 men who were administered 24 IU oxytocin and 10 men who were administered a placebo.
Results
The results demonstrated that the oxytocin group perceived social stimuli more quickly accompanied by subsequent larger increasing pupil diameter than nonsocial stimuli, indicating an increased unconscious salience of social stimuli.
Conclusion
These findings provided new insights into oxytocin’s modulatory role to social information processing, suggesting that oxytocin might enhance attentional bias to social stimuli even after removal of awareness. Psychiatry Investig 2020;17(4):292-298

Keyword

Oxytocin; Face; Unconscious; Pupil diameter