The audience was made up of university students. Every session included a 12 minute oral presentation. Participants were asked to improvise a talk about a new topic (e.g. violence against women, education system in Spain…). Participants had 3 minutes to prepare their speech. Difficulty increased based on each participant's pre assessment (topics and distractors as ringtones, audience whispering...)

Virtual reality was delivered through Psious platform distributed in Spain by TEA and through a Virtual Reality equipment that included a Samsung S7 mobile and Samsung Gear VR glasses.

Every session included a 12 minute oral presentation. Participants were asked to improvise a talk about a new topic (e.g. violence against women, education system in Spain…). Participants had 3 minutes to prepare their speech. Difficulty increased based on each participant's pre assessment (topics and distractors as ringtones, audience whispering...)

'Cognitive Fusion Questionnaire' assesses cognitive fusion (the tendency to believe the literal content of private events). It is a 7-item, seven-point Likert-type scale. Scores range between 7 and 49. Higher scores in the questionnaire indicate higher levels of cognitive fusion and worse outcome.

'Liebowitz Social Anxiety Scale' assesses social anxiety. It is a 24-item, four-point Likert-type scale. Scores range between 0 and 72. Scores above 51 indicates significant social anxiety (González, Bascaran & Saiz, 2001). Higher the score in the questionnaire, indicate higher levels of social anxiety and worse outcome.

'Self-Statements during public Speaking questionnaire' assesses positive and negative self-statements. It is a 10-item, six-point Likert-type scale. It includes two subscales. Scores in positive self-statements subscale range between 5 and 30. Higher the score in this subscale, indicate higher levels of positive self-statements and better outcome. Scores in negative self-statements subscale range between 5 and 30. Higher the score in this subscale, indicate higher levels of negative self-statements and worse outcome.

'Public speaking self-efficacy and fear questionnaire' assesses public speaking self-efficacy and public speaking fear. It is a 12-item, six-point Likert-type scale. It includes two subscales (self-efficacy and fear). Scores in self-efficacy subscale range between 12 and 72. Higher the score in the sef-efficacy subscale, indicate higher levels of public speaking self-efficacy and better outcome. Scores in public speaking fear subscale range between 12 and 72. Higher the score in the fear subscale, indicate higher levels of public speaking fear and worse outcome.

'Anxiety intensity subjective scale' asesses global self-assessment of intensity of public speaking anxiety VAS-ratings (range from 0 = very low intensity to 10 = very high intensity). Higher the score in scale, indicate higher levels of public speaking anxiety intensity and worse outcome.

'Anxiety interference subjective scale' assesses global self-assessment of interference of public speaking anxiety VAS-ratings (range from 0 = very low interference to 10 = very high interference). Higher the score in scale, indicate higher levels of public speaking anxiety interference and worse outcome.

'Satisfaction with performance subjective scale' assesses global self-assessment of satisfaction with performance VAS-ratings (range from 0 = very low satisfaction to 10 = very high satisfaction). Higher the score in scale, indicate higher satisfaction and better outcome.

Behavioral Checklist for Performance Anxiety assesses anxiety performance. It includes using video recordings, 'CODIMG' behavioral observation and analysis coding software. It is a 14-items checklist. Scores range between 0 and 14. Higher the score in the checklist, indicate higher levels of anxiety performance and worse outcome.