Oh this is one of my favorite territories. Seeing "amygdalae"
  just gave me a happy chill. Never used the plural form. I call
  it the "push from the amygdala". One of my favorite "brain
  circuits" (to stick with the computer/brain metaphor, which is
  hard to avoid using 'cause it's handy) - is the way the amygdala
  can give a stronger 'push' to the prefrontal cortex than the
  very weak way the prefrontal cortex can give back to the
  amygdala. Hence: your reasoning is driven by emotion, to put it
  simply. You can use your reasoning to control your emotion but
  the connection is ... wispier and takes training to strengthen
  the connection. That's my simplified take on it. Somewhere in my
  files I have the relative speeds (more data metaphors) for the
  amygdala --> prefrontal cortex vs the prefrontal cortex -->
  amydala. It's a striking difference and explains a lot for me.