Contrast models used in the analysis of imaging data in this study.

Contrasts 1–4 replicate the analyses conducted in our previous study using a similar methodology [1]. Contrasts 5–9 test for overlap in brain activation across the observation and execution phases (conjunction) for all expressions in the pain task (5), for pain-related effects (pain vs. neutral) in the pain (6) and movement task (7), and for task effects (8: PT>MT; 9: MT>PT). Note: pain 0 = neutral; pain 1 = mild pain; pain 2 = moderate pain; pain 3 = strong pain; PT—pain task; MT = movement task; Obs = observation (clip); Exec = execution (response).
Contrast models used in the analysis of imaging data in this study.

对比任务1至4重复了本研究团队此前一项研究中采用类似方法开展的分析[1]。对比任务5至9旨在检验疼痛任务中所有表情的观察与执行阶段的脑激活重叠情况（即联合分析，对应对比5）、疼痛任务（对应对比6）与运动任务（对应对比7）中疼痛相关效应（疼痛vs.中性状态）的脑激活重叠情况，以及两类任务间的效应差异（对比8：疼痛任务>运动任务；对比9：运动任务>疼痛任务）。
注：疼痛等级0=中性状态；疼痛等级1=轻度疼痛；疼痛等级2=中度疼痛；疼痛等级3=重度疼痛；PT=疼痛任务（pain task）；MT=运动任务（movement task）；Obs=观察（片段）；Exec=执行（任务响应）。
本研究中影像数据分析所采用的对比模型。