So Episodes 7&8.
The Cylon screaming in pain is one of those things that baffle me (why would machines program pain to work the same way as it does with humans?) but it's no better or worse than how the series has consistently portrayed Cylon 'evolution', frankly.
I'm sure it has something to do with Resurrection (the process, not the ship) that was dealt with in Caprica
. I could hypothesize that *inside* Cylons are digital copies of human souls, just like with Zoe Graystone.