First, study organizers placed participants on a political scale based on their degree of approval or disapproval on 20 hot-button political issues. They were then asked to study 120 negative, positive and neutral pictures in preparation for a memory test.
Afterward, participants viewed 240 pictures -- an even split of new and previously seen images -- and were asked to identify the pictures they had already seen.
Scientists hypothesized that they would see some difference in memory of positive and negative imagery between conservatives and liberals, but were surprised at the pronounced difference. The most conservative participants remembered about 91 percent of negative images compared with 80 percent of positive ones. The most liberal participants, in contrast, remembered about 84 percent of negative images compared with 86 percent of positive ones.