If you're at all familiar with Orthodoxy, you know that "stimulus-response" is the backbone of the Divine Services. When your priest utters a certain familiar phrase, the choir's appropriate response probably leaps from your mouth on its own. It's enough to make Pavlov blush. Now it's time to see how well trained you are: we'll supply the liturgical cue, and you give the response. All the answers are sitting in your subconcious. Have fun!