HablaRÉ: Self-applied Online Training for Correcting Emotional Reasoning Biases in Public Speaking Anxiety.

The System Usability Scale (SUS) will be used to measure usability and acceptability (Brooke, 1996; Castilla et al., 2023). Patients rate their agreement with statements on a 5-point Likert scale (from 1, "Strongly Disagree", to 5, "Strongly Agree") as part of the SUS, which evaluates the usability of ICT applications using 10 items. The item values, which range from 0 to 4, are added up, and the total is multiplied by 2.5 to determine the overall score, which is expressed as a percentage (0-100). Better perceived usability are indicated by a larger percentage (Bangor et al., 2008).

Using questions created by our team and previously used in technology-related studies, satisfaction with the intervention will be evaluated (Suso-Ribera, Castilla, Zaragozá, Ribera-Canudas, Botella, & García-Palacios, 2018). "To what extent are you satisfied with the app?" and "To what extent would you recommend the app?" are two examples of questions.

Adherence rates will be assessed according to the number of sessions completed by participants. Both the number of participants who fully complete the intervention (including the intervention, the final evaluation and the follow-up) and those who drop out will be considered. In these cases, it will be specifically identified at which stage of the process the drop-out occurred.

Interaction with the platform will be measured using access logs, specifically tracking the number of times participants log in for each session.

ERPSAS is a self-report instrument consisting of the presentation of 4 scenarios with different endings depending on whether objective safety or danger information is presented and whether there is an anxiety response or not. Based on these scenarios, the participant must measure, on a visual analogue scale (VAS) from 0 to 100, the degree of danger, safety, controllability, desire to avoid the situation and degree of discomfort. The sum of these scales provides a single perceived threat score, providing a measure to determine the presence of the emotional reasoning bias. If the participant evaluates emotional situations as threatening without objective information of danger, the presence of an Emotional Reasoning bias arises.

The scale has a range of 0-96 points (M= 36.57; SD= 14.18). The higher the score, the greater the emotional reasoning bias, with the cut-off point being a score of 47. Participants scoring above half a standard deviation above the mean will be included.

The Public Speaking Anxiety Scale, which contains 17 items with a 5-point Likert-type response format (1=Not at all, 5=Extremely). This scale measures the presence and severity of cognitive, behavioural, and physiological symptomatology related to fear of public speaking, with a cut-off point of 73 (M= 49.33; SD= 12.88). Participants scoring above half a standard deviation above the mean will be included.

OASIS is a 5-item self-report instrument that assesses a unidimensional factor related to the severity and frequency of anxiety symptoms, as well as behavioral avoidance and functional impairment associated with these symptoms in the past week. Each item has five response options, coded from 0 to 4. The total score is calculated by adding the values of all items, ranging from 0 to 20. Scores higher than 8 indicate the presence of anxiety symptoms. This scale has been validated online in a sample of patients with depression and anxiety, demonstrating good internal consistency (α=0.86), as well as adequate convergent and discriminantvalidities and sensitivity to change.

ODSIS is a 5-item self-report instrument that the severity and functional impairment linked to depression over the past week. Each item has five response options coded from 0 to 4. The total score is calculated by summing the values of all items, ranging from 0 to 20. Scores of 5 or above suggest depressive symptoms. This scale was validated online using a sample of patients with depressive or anxiety disorders. It demonstrates excellent internal consistency (α=0.92), and its construct, convergent, and discriminant validities are supported.

The QLI is a 10-item self-report instrument that assesses a single concept of quality of life across 10 dimensions using a ten-point Likert scale (1=poor; 10=excellent). The dimensions include physical well-being, psychological/emotional well-being, self-care and independent functioning, occupational functioning, interpersonal functioning, social-emotional support, community and services support, personal fulfilment, spiritual fulfilment, and overall perception of quality of life. The total score is the average of the item scores, ranging from 1 to 10 (1-4.5 = below average quality of life; 4.6-8.1 = average quality of life; 8.2-10 = above average quality of life). The QLI demonstrates high internal consistency (α=0.89) and test-retest reliability (0.89), with discriminant validity evidenced in a sample of psychiatric patients.

For participants who do not complete treatment, they will be asked voluntarily for the reason for discontinuing treatment.