In regards to my 2nd question right here:

2.) It mentions in this video that the amygdala becomes hyperactive during depression and I'm wondering--can there be moments in depression where a loss of pleasure activity during depression can actually exceed that of the activity gained by the amygdala plus other brain regions in the limbic system that make you depressed/control depressive thoughts?

And also, a 3rd question I have right here:

3.) When a loss of pleasure activity does occur during depression, can there be no additional activity gained by the amygdala and other brain regions in the limbic system that make you depressed/control depressive thoughts as a result of that loss of pleasure?

This is the video right here (that states the amygdala become hyperactive both in the video itself and in the video description):

http://www.thevisualmd.com/health_ce...pression_video