Table 2. Example arrangement of images across days in conditions of high cumulative diversity.

Each number corresponds to an image subjects learned about. The arrangement ensured that every image would be pitted against four distinct images across two learning sessions Brackets group images that were pitted against each other. A) Low concurrent. Each game consisted of three images each pitted against the two other images. B) High concurrent. Each game consisted of six images, with each image pitted against two other images.

A) Low concurrent
Day 1	Day 2	Day 3
Morning session
Game 1: {1,2,3}	Game 1: {2,5,6}	Game 1: {14,15,18}
Game 2: {7,8,9}	Game 2: {8,11,12}	Game 2: {13,16,17}
Evening session
Game 1: {1,4,5}	Game 1: {3,4,6}	Game 1: {13,14,17}
Game 2: {7,10,11}	Game 2: {9,10,12}	Game 2: {15,16,18}