Article proving trust/reward cycle is generated in the brain and where.  How
more so when mothers meet infant needs immediately through breastfeeding!
Judy Ritchie

April 1, 2005
Study of Social Interactions Starts With a Test of Trust
By HENRY FOUNTAIN

...scientists are reporting today that they have succeeded in visualizing
feelings of trust developing in a specific region of the brain. 
In the study, pairs of anonymous subjects were strapped into magnetic
resonance imaging scanners 1,500 miles apart. The participants played 10
consecutive rounds of a risk-taking game that involved balancing monetary
profit and trust. While they played, the scanners, synchronized through the
Internet, measured how the subjects' brains reacted.
With the development of trusting feelings, increased blood flow occurred in
the caudate nucleus, an area in the rear part of the brain that is involved
in processing rewards. Over time, this increased blood flow appeared earlier
as an expectation of trustworthiness was established. 
The study's authors, from Baylor College of Medicine in Houston and the
California Institute of Technology, say their work shows that, at some
level, the process of building trust is as basic as obtaining food or other
rewards. The caudate nucleus appears to play a central role in evaluating
the fairness of another person's actions and in signaling the intention to
trust that person. Future studies, they said, may prove useful for
understanding autism, schizophrenia or other behavioral disorders where the
ability to form internal models of other people may be impaired.
By allowing neuroscientists to measure how two brains act and interact, the
novel M.R.I. technique, called hyperscanning, also opens avenues of research
in a relatively new field, real-time brain imaging of human social
interactions.

http://www.nytimes.com/2005/04/01/science/01trust.html?pagewanted=print&posi
tion=

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