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.
This paper presents an experiment investigating the impact of behavior and responsiveness on social responses to virtual humans in an immersive virtual environment (IVE). A number of responses are investigated, including presence, copresence, and two physiological responses-heart rate and electrodermal activity (EDA). Our findings suggest that increasing agents' responsiveness even on a simple level can have a significant impact on certain aspects of people's social responses to humanoid agents.Despite being aware that the agents were computer-generated, participants with higher levels of social anxiety were significantly more likely to avoid "disturbing" them. This suggests that on some level people can respond to virtual humans as social actors even in the absence of complex interaction.Responses appear to be shaped both by the agents' behaviors and by people's expectations of the technology. Participants experienced a significantly higher sense of personal contact when the agents were visually responsive to them, as opposed to static or simply moving. However, this effect diminished with experienced computer users. Our preliminary analysis of objective heart-rate data reveals an identical pattern of responses.
This paper examines a necessary condition for successful exploitation of a Virtual Environment (VE) in therapeutic intervention for fear of public speaking. The condition is that clients experience a degree of anxiety in the VE that is similar to what they would have been expected to experience in a similar real world setting. We refer to this as a 'presence' response. The experimental study involved 20 people who were confident public speakers and 16 who were phobic, assessed on a standard psychological scale. Half of each group spoke within a VE depicting an empty seminar room, and the other half within the same room but populated by a neutrally behaving virtual audience of five people. Three responses were measured -a questionnaire-based measure of anxiety, a measure of self-focused attention on somatic responses, and actual heart rate. On all responses the people with phobia showed a significant increase in signs of anxiety when speaking to the virtual audience compared to the empty room, whereas the confident people did not. The result was strong in spite of the relatively low representational and behavioral fidelity of the virtual characters.
Abstract. Can virtual reality exposure therapy be used to treat people with social phobia? To answer this question it is vital to know if people will respond to virtual humans (avatars) in a virtual social setting in the same way they would to real humans. If someone is extremely anxious with real people, will they also be anxious when faced with simulated people, despite knowing that the avatars are computer generated? In [17] we described a small pilot study that placed 10 people before a virtual audience. The purpose was to assess the extent to which social anxiety, specifically fear of public speaking, was induced by the virtual audience and the extent of influence of degree of immersion (head mounted display or desktop monitor. The current paper describes a follow up study conducted with 40 subjects and the results clearly show that not only is social anxiety induced by the audience, but the degree of anxiety experienced is directly related to the type of virtual audience feedback the speaker receives. In particular, a hostile negative audience scenario was found to generate strong affect in speakers, regardless of whether or not they normally suffered from fear of public speaking.
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