In June 1980, Forgas et al. conducted a field study of audience effects, looking at the performance of expert and novice squash players when observed by no audience, a male audience, and a female audience. Contrary to Zajonc's drive-arousal theory, it was found that the effect of an audience on performance did not differ significantly between novice and expert players. This indicates that the other factors, such as cognitive variables and players' interpretation of the audience's presence, also influence players' reactions to the presence of an audience in a natural setting.