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4

The Placebo Effect Is Robust to Negative Descriptions of AI

Fig. 2. Trial sequence during the letter discrimination task. The duration of the ISI followed a Gaussian
distribution (M = 1000 ms, SD = 600 ms). Key responses (left or right arrow) were logged during the presentation
of the mask.

Each participant underwent 400 trials derived from 2 Blocks × 100 trials of one random letter
pair × 2 Status (sham-AI condition vs. no-AI). After each block, they were offered a short break.
4.1.2 Questionnaires.

Unpublishedworkingdraft.
Notfordistribution.
AI enhance sour performance