Oxytocin, Narcissism, and Psychopathy Articles

Oxytocin levels appear to be related to feelings of empathy or the lack thereof. If this is conclusive, then the absence of oxytocin is epidemic in certain populations.

• Medical News Today 09/07/2017: What is the link between love and oxytocin? 
• Psychology Today: What Is Oxytocin? 
• 09/27/2017: Oxytocin Ain't Behavin' How Scientists Thought It Would 
• Wikipedia: Oxytocin 
• HuffPost 08/07/2016: The Spellbinding Bond To Narcissists And Psychopaths – What's Happening In The Brain? 
• NCBI: "The role of oxytocin in psychiatric disorders: A review of biological and therapeutic research findings" 
• Science Daily 06/19/2013: Altered brain structure in pathological narcissism 
• PsychCentral 08/08/2018: Oxytocin Fuels Distinction of Self & Others 
• LiveScience 06/24/2013: Narcissists' Lack of Empathy Detected in Brain Scans 

That's enough for now. There's plenty more to find.