General procedure
post-training cognitive bias
MINOR, RECRUITMENT
The general procedure was identical to study 1, except for the following minor differences. Due to the COVID-19 lockdown restrictions, participants were contacted through advertising in social media and social networks, and the entire procedure was conducted online. Thus, after participants were randomized to the OCAT or the sham-control group, they were provided with online instructions on how to complete the psychological and emotion regulation measures as well as on how to download, install, and use the mobile training app. First, participants signed an online consent form, before completing the psychological measures via Qualtrics software. Then, they installed the app and completed attention and interpretation biases as baseline assessment (Time 1). Immediately afterwards, they started the first online session of the OCAT or sham-control. Identically to study 1, they then completed a total of 10 sessions of online training, on a daily basis, with the same instructions as in Study 1. As in Study 1, the post-training cognitive bias assessments (Time 2) were collected immediately after completing the last training session, whereas the post-training psychological assessments were collected the day after the last training session via Qualtrics. Given the changing situation experienced across the initial COVID-19 lockdown period, it was decided to restrict recruitment for the study to a specific short-time period during lockdown. Sample recruitment was specifically performed during one week at the end of April 2020 (a very restrictive period of the lockdown in Spain). The study was conducted in compliance with the Declaration of Helsinki (World Medical Association, 