Here, they observed how the learning and performance curves of the test subjects changed over the course of the experiment. (sciencedaily.com)
If you want to decline to answer altogether, you could go with, «Oh, I don't like talking about money,» followed by a quick subject change. (careerdigital.com)
Patrick Wingrove asks UK practitioners how copyright will change after Brexit, and analyses the EU Commission's recent report on the subject (managingip.com)