The displayed versions were counterbalanced so that every subject performed each pairwise comparison of models twice, once in each order.
(2004) found that, among schoolchildren, girls preferred a tutoring system that included an animated agent, while boys preferred one that did not;  found that a more expressive talking head decreased male subjects' task performance when using the full COMIC system; while Bickmore and Cassell (2005) found that women trusted the REA agent more in embodied mode, while men trusted her more over the telephone.