Participants sat in a chair in front of a computer screen (experiment 1) or laid supine on the MRI patient table with their head fixed by firm foam pads (experiment 2). They were then connected to both the olfactometer and the thermode and underwent the olfactory and thermal stimuli selection sessions (as described above; see the Supplementary Materials for full details), followed by the main experiment. In experiment 1, visual stimuli were projected from a PC (Dell) on a screen (1024 × 768 resolution). Keypresses were recorded on a keyboard (Dell). In experiment 2, the visual stimuli were projected inside the scanner bore with a LCD projector (CP-SX1350, Hitachi, Japan) on a screen (1024 × 768 resolution). Keypresses were recorded on an MRI-compatible bimanual response button box (HH-2 x 4-C, Current Designs Inc., USA).

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