The focusing effect is when you pay more attention to something that seems important or interesting to you. For example, if your favorite type of ice cream is chocolate, then you might pay more attention to all the chocolate flavored ice cream at the store than the other flavors. You're focusing on the chocolate ice cream and ignoring the other flavors. The focusing effect can make it hard to remember things that don't seem important or interesting, so it's important to try to stay focused on everything, not just one thing.