Procedure
After registering and logging in to the study platform, participants provided demographic and background clinical information, then completed a sound test to check device compatibility. Next they completed the DARS, QIDS, GAD-7, PMH, AST, SUIS, and PIT, with the baseline QIDS used to determine eligibility. After confirming readiness to start the next phase, participants were randomized to condition (see below). Participants then read a brief description of their assigned condition and completed the CEQ.Over the next four weeks, participants were scheduled to complete a set of questionnaires (QIDS, GAD-7, PMH) each week, as well as training sessions according to their allocated condition. Automated emails were sent to remind participants about scheduled training sessions or questionnaires, and participants could see a graphical display of their scores within the online system. At four weeks post-baseline, participants were requested to complete the final set of questionnaires, the DARS, QIDS, GAD-7, PMH, AST, and PIT, followed by the NEQ and feedback questionnaire. They then received debriefing information and were given the option of starting a new training schedule of their choice. Participants had one week to complete the final questionnaires, after which they were no longer available and counted as missing data.