Looking at the pattern so far, my opponent has chosen rock 2 times, paper 1 time, and scissors 3 times. There's a slight tendency toward scissors, which might suggest they're trying to counter my previous paper plays that were successful. However, they might anticipate me switching to rock to counter their scissors, so they might play paper. Given that my paper plays have been successful (winning in rounds 3 and 5), and considering this psychological layer, I'll choose paper for round 7. This will beat rock if they return to it, and tie against paper if they try to counter my anticipated rock.