158 Manipulation check exit questions At the end of the experiment, participants completed an exit questionnaire containing manipulation check questions, for instance regarding pain expectations, trust, and fear. The questions are described in supplementary material. All questionnaires were displayed on a computer monitor via web-based survey software (Qualtrics, Utah). Questionnaires A screening questionnaire containing demographic and health questions was used to screen participants for inclusion in the study. Four psychological questionnaires were administered. A short State Anxiety version of the State-Trait Anxiety Inventory, (STAI-S-s) 33,34 was administered before the start of the experiment and the State-Trait Anxiety Inventory, Trait version (STAI-T) 34 was also used. The Pain Catastrophizing Scale (PCS) 35 was used to assess catastrophizing thoughts related to pain, or pain-related worrying 36. The Fear of Pain Questionnaire (FPQ-III) 37 was used to measure fear of minor, severe, and medical pain. Total scores were used for all questionnaires. Experimental Procedure On the day of the lab session (lasting approximately 90 minutes), participants received information about the experiment after which they provided written informed consent. Then, participants completed the screening for inclusion, followed by the STAI-S-s. Then, the EMG electrodes were attached 32 and the mock skin sensitivity test was performed. Warmth and pain threshold levels were then tested and individual pain stimuli were calibrated. The sham electrodes were then
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