4. Bryn adopted her cat, Minnie, from the local shelter. She feeds Minnie dry food, but the previous owner fed her canned food. Every time Bryn opens her refrigerator, her new cat comes running. Bryn never gives Minnie food after she opens the refrigerator, however, so eventually Minnie stops showing up. Once in a while, though, Minnie will come running when Bryn opens the refrigerator, as if food is forthcoming. This reappearance of Minnie's old behavior is called: *