BackgroundStanley Milgram's 1960s experimental findings that people would administer apparently lethal electric shocks to a stranger at the behest of an authority figure remain critical for understanding obedience. Yet, due to the ethical controversy that his experiments ignited, it is nowadays impossible to carry out direct experimental studies in this area. In the study reported in this paper, we have used a similar paradigm to the one used by Milgram within an immersive virtual environment. Our objective has not been the study of obedience in itself, but of the extent to which participants would respond to such an extreme social situation as if it were real in spite of their knowledge that no real events were taking place.MethodologyFollowing the style of the original experiments, the participants were invited to administer a series of word association memory tests to the (female) virtual human representing the stranger. When she gave an incorrect answer, the participants were instructed to administer an ‘electric shock’ to her, increasing the voltage each time. She responded with increasing discomfort and protests, eventually demanding termination of the experiment. Of the 34 participants, 23 saw and heard the virtual human, and 11 communicated with her only through a text interface.ConclusionsOur results show that in spite of the fact that all participants knew for sure that neither the stranger nor the shocks were real, the participants who saw and heard her tended to respond to the situation at the subjective, behavioural and physiological levels as if it were real. This result reopens the door to direct empirical studies of obedience and related extreme social situations, an area of research that is otherwise not open to experimental study for ethical reasons, through the employment of virtual environments.

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This paper describes an experiment to assess the anxiety responses of people giving five minute presentations to virtual audiences consisting of eight male avatars. There were three different types of audience behaviour -an emotionally neutral audience that remained static throughout the talk, a positive audience which exhibited friendly and appreciative behaviour towards the speaker, and a negative audience, which exhibited hostile and bored expressions throughout the talk. A second factor was immersion: half of the 40 subjects experienced the virtual seminar room through a head-tracked head-mounted display and the remainder on a desktop system. Responses were measured using standard Personal Report of Confidence as a Public Speaker (PRCS) which was elicited prior to the experiment and after each talk. Several other standard psychological measures such as SCL-90-R (for screening for psychological disorder), the SAD and the FNE were also measured prior to the experiment. Other response variables included subjectively assessed somaticisation and a subject self-rating scale on performance during the talk.The subjects gave the talk twice each to a different audience, but in the analysis only the results of the first talk are presented -thus making this a between-groups design. The results show that posttalk PRCS is significantly and positively correlated to PRCS measured prior to the experiment in the case only of the positive and static audiences. For the negative audience, prior PRCS was not a predictor of post-PRCS which was higher than for the other two audiences and constant. The negative audience clearly provoked an anxiety response irrespective of the normal level of public speaking confidence of the subject. The somatic response also showed a higher level of anxiety for the negative audience than for the other two, but self-rating was generally higher only for the static audience, each of these results taking into account prior PRCS.