Figure 2.

Main General Linear Model (fMRI). The main GLM included 8 categorical and 8 parametric regressors. The 8 categorical regressors modelled the ‘preparation’ phase, the ‘inference’ phase, the ‘response’ phase, and control trials (not shown here), in both the Non-Social ‘Basic’^1–4 and Non-Social ‘Superordinate’^5–8 tasks (2*4 regressors). Two parametric regressors were derived from the ‘preparation’ regressors to capture the modulation of BOLD activity by prior in Basic⁹ and Superordinate¹⁰ trials. Six additional parametric regressors were derived from the ‘inference’ regressors, to capture the modulation of BOLD activity by prior, visuomotor evidence, and their interaction, in Basic^11–13 and Superordinate^14–16 trials. Note that the structure of the GLM was strictly identical in Experiment 1 and 2.