I use my computer to watch my favorite television shows online. Once on the website, I click on my favorite show. Sometimes when I first attempt to watch a show, it does not load right away. But within a second or so, I see the loading pinwheel on the screen, and then I will immediately be able to watch my favorite show. Therefore, through pairing the original reinforcer (my favorite show), with the neutral stimulus (loading pinwheel), the loading pinwheel has become a ______