Psychophysiological recordings
SKIN
Electromyogram (EMG) was recorded from the orbicularis oculi muscle of the participants’ left eye, with two 4 mm Ag/AgCl cup electrodes filled with high-conductance gel. The electrodes were positioned below the lower eyelid on the muscle, in a vertical line with the pupil in forward gaze, and below the lateral canthus. Electromyogram was amplified with a gain of 2000, low-pass filtered at 1 Hz and high-pass filtered at 500 Hz (EMG100C, Biopac Systems). Skin conductance was recorded with a 0.5-V constant voltage (EDA100C, Biopac Systems) from the thenar/hypothenar of the nondominant hand, with disposable Ag/AgCl snap electrodes (EL507, Biopac Systems), filled with 0.5% NaCl electrolyte gel (