Lisa is from the United States and celebrates Thanksgiving on the traditional Thursday in November. Her colleague suggested their office celebrate Canadian Thanksgiving, which occurs on the second Monday in October. Lisa didn’t hear which day of the week they were celebrating and planned to bring her dish in on Thursday. When she got to work on Monday, the refrigerator was full of food for the celebration. Lisa told her colleagues, "I thought we were celebrating on Thursday!" What developmental process did Lisa utilize?