"PsyFlex" (Gloster et al., in review). The questionnaire contains 6 items, which refer to the last 7 days. A higher score indicates a higher psychological flexibility. The scale is a 5-point scale, where 5 = very often, 4 = often, 3 = from time to time, 2 = seldom, and 1 = very seldom.

"Social Interaction Scale" (SIS; self-designed). The Social Interaction Scale is a self-designed 3-item self-report measuring the frequency, duration, and discomfort of social interactions in the last 24 hours. Item one is rated on a 4-point scale, item 2 on a 3-point scale. The SIS has been previously used in a longitudinal study to measure the level of social interaction experienced by the respondent.

"World Health Organization Disability Assessment Schedule, WHODAS-2" (Garin et al., 2010).The total score has a range from 0 to 100, with higher scores indicating higher levels of disability. The questionnaire contains 18 items (in the german version) measuring abilities on a 5-point scale where 1 = None, 2 = Mild, 3 = Moderate, 4 = Severe, 5 = Extreme or cannot do. In the last three items participant have to indicate the number of days during the last 30 days when they had the difficulties listed in the 15 first items or when participants were unable/restricted to carry out their usual activities or work because of their health condition.

"Difficulties in Emotion Regulation Scale" (DERS; Gratz & Roemer, 2004). The measure is scored such that higher scores reflect greater difficulties in emotion regulation. The questionnaire contains overall 36 items and is measured on a 5-point scale, where 1 = almost never (0 - 10%), 2 = sometimes (11 - 35%), 3 = about half the time (36 - 65%), 4 = most of the time (66 - 90%), 5 = almost always (91 -100%). The minimal possible score is 36; the maximum possible score is 180.

"The Mental Health Continuum - Short Form" (MHC-SF; Karim & Noor, 2006). The MHC-SF is a 14-item self-report measure of emotional, social and psychological well-being. Each item is rated on a 6-point scale, where never = 0, once or twice = 1, about once a week = 2, about 2 or 3 times a week = 3, almost every day = 4, every day=5. The total score has a thus a range from 0 - 70. A higher score indicates better mental health.

"Brief Symptom Checklist" (BSCL; Franke et al., 2015). The BSCL represents a psychological test instrument for the assessment of psychological symptoms and psychological distress. The questionnaire contains 53 items, and a 5-point scale is used, where 0 = not at all, 1 = a little, 2 = quite a bit, 3 = a lot and 4 = overwhelmingly. The GSI (Global Severity Index), the PST (Positive Symptom Total), and the PSDI (Positive Symptom Distress Index) are formed as overall scores and can range from 20 to 80. Higher scores indicate higher symptom load.

The "Daily Stress Scale" (DSS; Scholten et al., 2014) is a 7-item self-report measure of perceived stress in different life domains. The subjective degree of stress is assessed on a 7-point scale from 1 (little incriminating) to 7 (not affected). Higher scores indicate a higher perceived stress level.

"Prosocialness Scale for Adults" (PSA; Caprara et al., 2005). The Prosocialness Scale for Adults measures an individuals prosocial behavior with 16 items. For all items a five-point Likert scale is used; indicating whether the statement was never/almost never true = 1, occasionally true = 2, sometimes true = 3, often true = 4, and almost always/always true = 5. Higher score indicate a greater markedness of the prosociality trait.

"Self-Efficacy Scale" (self-developed). This questionnaire contains two sections with an overall of 7 items. The first four items are measured on a 5-point scale from "not sure at all" (coded as 1) to "very sure" (coded as 5). The last three items are also measured on a 5-point scale with "totally disagree" coded as 1 to "totally agree" coded as 5. Higher scores indicate higher self-efficacy.

"Media and Technology Usage and Attitudes Scale" (MTUAS; Rosen et al., 2013). For all items a five-point Likert scale (strongly agree = 5, agree = 4, neither agree nor disagree = 3, disagree = 2, strongly disagree = 1) was used. Item 15 is the only item, where the scoring was reversed. The first three items as well as item 7,8 and 9 assess positive attitudes towards technology and higher scores indicate more positive attitudes toward technology. The item 4 to 6 measure technological dependency and anxiety. Higher scores indicate a greater technological anxiety and dependence. Item 10 to 12 are part of the scale for negative attitudes with higher scores indicating more negative attitudes toward technology. The last four items (13 to 16) measure a preference for task switching; higher scores indicate a greater preference for task switching.

Trusting Beliefs is captured by a 10-item rating scale (modified from Wang & Benbasat, 2007) with a 7-point Likert scale, where 1 = totally agree and 7 = totally disagree. Lower scores indicate trusting beliefs towards the Avatar, and higher scores indicate distrust.

Social Presence is captured by a one-item scale (modified from Gefen & Straub, 2003) measuring social presence by a 7-point scale, that is coded as following: 1 = strongly disagree to 7 = strongly disagree. A Lower score a good social presence of the Avatar, a higher score indicates a lack of social presence.