What aspects of Deep Learning are biologically plausible?

Something I’ve been struggling to wrap my head around ever since I joined the lab is whether Deep Learning is biologically plausible or not. Recentely, I’ve broken down this concern into two sub-questions:

I know @Eric has been working on this, but I was wondering if anyone else had some insight.

Thanks to Eric’s awesome thesis, I was able to answer both of these linked questions on psychology.stackexchange.com.