“…We also collected additional data (complexity, familiarity, puzzlingness, and interest, henceforth "secondary variables"). While these variables are known to be related to preference (e.g., Berlyne, 1960Berlyne, , 1971Berlyne, , 1974Martindale and Moore, 1989;Martindale et al, 1990;North and Hargreaves, 2000;Silvia, 2005;Hargreaves and North, 2010;Chmiel and Schubert, 2017), our intention for including the secondary variables was to help us to ascertain the unusualness (characterized by high complexity, high puzzlingness, and low familiarity) of the stimuli selected and to help explain any unexpected results.…”