Hormones and Behavior

I stumbled upon this article earlier today.

(PhysOrg.com) -- Oxytocin is a hormone produced by the hypothalamus in the brain, and has been shown to make people trust each other more and promote feelings of love. But this hormone has now been found to have limits, since it promotes love and trust only towards people of the same "in-group" and not towards people who are seen as different. Psychologists have therefore concluded it is involved in ethnocentrism.

There's been a misunderstanding in the scientific community for quite some time. Lots of psuedo-scientists, and unfortunately, some scientists as well, believe that certain chemicals involved in the brain are responsible for certain behaviors or mental states. For example, testosterone is the "aggression hormone," and oxytocin is the "love hormone."

The problem here is that there's not a really good understanding of what is the cause, and what is the