Self-monitoring placebo (SMP)
APPENDIX
For SMP participants, the standardized video began with the first author The psychoeducation and treatment rationale video for SMP showed the therapist instructing participants to self-monitor by being highly attentive to their cognitions and emotions and observing any distress related to them. Next, like MEMI, all experimenters administered the 6-item CEQ and set up the SMP on their smartphone after each SMP participant showed they understood the rationale and self-monitoring technique (Appendix C in the Online Supplementary Material). Participants received a copy of the SMP handout with no instructions to review it regularly.