Teen boys’ anger tied to brain development - Kids and parenting- msnbc.com

The source of anger among teen youths could very well lie in their brains:

“‘Boys who had large amygdalas spent more time behaving in an aggressive way.’

…[The amygdala is the] part of the brain located deep within the medial temporal lobes that is believed to be involved with emotional responses, including arousal and fear.

These boys also appeared to have small prefrontal cortexes, a region of the brain that has to do with regulating emotions.”