There were 13 adult volunteers (9 male, 4 female). One reported more than 10 minutes prior experience with virtual environments. The participants are summarized in Table 5.4.
Id is the participant number, Gn gives the gender. Prev is ``1'' if the participant had more than 10 minutes of prior experience in virtual environments, ``0'' otherwise. Age data was not collected for this experiment, beyond noting that all participants were over 18.
The procedure for Experiment AIIE2 was identical to Experiment AIIE1 except for two modifications. Firstly, Experiment AIIE2 was run using a double-blind procedure in which the experimenter (as well as the participants) was kept unfamiliar with the hypothesis. The experimenter was a new visiting student from Europe. He administered the questionnaires in sealed envelopes and was not shown their content, or allowed to discuss the experiment, until after it was concluded. In addition, participants were instructed not to discuss the experiment with the experimenter.
Secondly, the order of presence questions about the two conditions was randomized across participants.